test-action-debian-package/node_modules/undici/lib/fetch/index.js
2024-01-06 13:51:02 +01:00

2146 lines
74 KiB
JavaScript
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// https://github.com/Ethan-Arrowood/undici-fetch
'use strict'
const {
Response,
makeNetworkError,
makeAppropriateNetworkError,
filterResponse,
makeResponse
} = require('./response')
const { Headers } = require('./headers')
const { Request, makeRequest } = require('./request')
const zlib = require('zlib')
const {
bytesMatch,
makePolicyContainer,
clonePolicyContainer,
requestBadPort,
TAOCheck,
appendRequestOriginHeader,
responseLocationURL,
requestCurrentURL,
setRequestReferrerPolicyOnRedirect,
tryUpgradeRequestToAPotentiallyTrustworthyURL,
createOpaqueTimingInfo,
appendFetchMetadata,
corsCheck,
crossOriginResourcePolicyCheck,
determineRequestsReferrer,
coarsenedSharedCurrentTime,
createDeferredPromise,
isBlobLike,
sameOrigin,
isCancelled,
isAborted,
isErrorLike,
fullyReadBody,
readableStreamClose,
isomorphicEncode,
urlIsLocal,
urlIsHttpHttpsScheme,
urlHasHttpsScheme
} = require('./util')
const { kState, kHeaders, kGuard, kRealm } = require('./symbols')
const assert = require('assert')
const { safelyExtractBody } = require('./body')
const {
redirectStatusSet,
nullBodyStatus,
safeMethodsSet,
requestBodyHeader,
subresourceSet,
DOMException
} = require('./constants')
const { kHeadersList } = require('../core/symbols')
const EE = require('events')
const { Readable, pipeline } = require('stream')
const { addAbortListener, isErrored, isReadable, nodeMajor, nodeMinor } = require('../core/util')
const { dataURLProcessor, serializeAMimeType } = require('./dataURL')
const { TransformStream } = require('stream/web')
const { getGlobalDispatcher } = require('../global')
const { webidl } = require('./webidl')
const { STATUS_CODES } = require('http')
const GET_OR_HEAD = ['GET', 'HEAD']
/** @type {import('buffer').resolveObjectURL} */
let resolveObjectURL
let ReadableStream = globalThis.ReadableStream
class Fetch extends EE {
constructor (dispatcher) {
super()
this.dispatcher = dispatcher
this.connection = null
this.dump = false
this.state = 'ongoing'
// 2 terminated listeners get added per request,
// but only 1 gets removed. If there are 20 redirects,
// 21 listeners will be added.
// See https://github.com/nodejs/undici/issues/1711
// TODO (fix): Find and fix root cause for leaked listener.
this.setMaxListeners(21)
}
terminate (reason) {
if (this.state !== 'ongoing') {
return
}
this.state = 'terminated'
this.connection?.destroy(reason)
this.emit('terminated', reason)
}
// https://fetch.spec.whatwg.org/#fetch-controller-abort
abort (error) {
if (this.state !== 'ongoing') {
return
}
// 1. Set controllers state to "aborted".
this.state = 'aborted'
// 2. Let fallbackError be an "AbortError" DOMException.
// 3. Set error to fallbackError if it is not given.
if (!error) {
error = new DOMException('The operation was aborted.', 'AbortError')
}
// 4. Let serializedError be StructuredSerialize(error).
// If that threw an exception, catch it, and let
// serializedError be StructuredSerialize(fallbackError).
// 5. Set controllers serialized abort reason to serializedError.
this.serializedAbortReason = error
this.connection?.destroy(error)
this.emit('terminated', error)
}
}
// https://fetch.spec.whatwg.org/#fetch-method
function fetch (input, init = {}) {
webidl.argumentLengthCheck(arguments, 1, { header: 'globalThis.fetch' })
// 1. Let p be a new promise.
const p = createDeferredPromise()
// 2. Let requestObject be the result of invoking the initial value of
// Request as constructor with input and init as arguments. If this throws
// an exception, reject p with it and return p.
let requestObject
try {
requestObject = new Request(input, init)
} catch (e) {
p.reject(e)
return p.promise
}
// 3. Let request be requestObjects request.
const request = requestObject[kState]
// 4. If requestObjects signals aborted flag is set, then:
if (requestObject.signal.aborted) {
// 1. Abort the fetch() call with p, request, null, and
// requestObjects signals abort reason.
abortFetch(p, request, null, requestObject.signal.reason)
// 2. Return p.
return p.promise
}
// 5. Let globalObject be requests clients global object.
const globalObject = request.client.globalObject
// 6. If globalObject is a ServiceWorkerGlobalScope object, then set
// requests service-workers mode to "none".
if (globalObject?.constructor?.name === 'ServiceWorkerGlobalScope') {
request.serviceWorkers = 'none'
}
// 7. Let responseObject be null.
let responseObject = null
// 8. Let relevantRealm be thiss relevant Realm.
const relevantRealm = null
// 9. Let locallyAborted be false.
let locallyAborted = false
// 10. Let controller be null.
let controller = null
// 11. Add the following abort steps to requestObjects signal:
addAbortListener(
requestObject.signal,
() => {
// 1. Set locallyAborted to true.
locallyAborted = true
// 2. Assert: controller is non-null.
assert(controller != null)
// 3. Abort controller with requestObjects signals abort reason.
controller.abort(requestObject.signal.reason)
// 4. Abort the fetch() call with p, request, responseObject,
// and requestObjects signals abort reason.
abortFetch(p, request, responseObject, requestObject.signal.reason)
}
)
// 12. Let handleFetchDone given response response be to finalize and
// report timing with response, globalObject, and "fetch".
const handleFetchDone = (response) =>
finalizeAndReportTiming(response, 'fetch')
// 13. Set controller to the result of calling fetch given request,
// with processResponseEndOfBody set to handleFetchDone, and processResponse
// given response being these substeps:
const processResponse = (response) => {
// 1. If locallyAborted is true, terminate these substeps.
if (locallyAborted) {
return Promise.resolve()
}
// 2. If responses aborted flag is set, then:
if (response.aborted) {
// 1. Let deserializedError be the result of deserialize a serialized
// abort reason given controllers serialized abort reason and
// relevantRealm.
// 2. Abort the fetch() call with p, request, responseObject, and
// deserializedError.
abortFetch(p, request, responseObject, controller.serializedAbortReason)
return Promise.resolve()
}
// 3. If response is a network error, then reject p with a TypeError
// and terminate these substeps.
if (response.type === 'error') {
p.reject(
Object.assign(new TypeError('fetch failed'), { cause: response.error })
)
return Promise.resolve()
}
// 4. Set responseObject to the result of creating a Response object,
// given response, "immutable", and relevantRealm.
responseObject = new Response()
responseObject[kState] = response
responseObject[kRealm] = relevantRealm
responseObject[kHeaders][kHeadersList] = response.headersList
responseObject[kHeaders][kGuard] = 'immutable'
responseObject[kHeaders][kRealm] = relevantRealm
// 5. Resolve p with responseObject.
p.resolve(responseObject)
}
controller = fetching({
request,
processResponseEndOfBody: handleFetchDone,
processResponse,
dispatcher: init.dispatcher ?? getGlobalDispatcher() // undici
})
// 14. Return p.
return p.promise
}
// https://fetch.spec.whatwg.org/#finalize-and-report-timing
function finalizeAndReportTiming (response, initiatorType = 'other') {
// 1. If response is an aborted network error, then return.
if (response.type === 'error' && response.aborted) {
return
}
// 2. If responses URL list is null or empty, then return.
if (!response.urlList?.length) {
return
}
// 3. Let originalURL be responses URL list[0].
const originalURL = response.urlList[0]
// 4. Let timingInfo be responses timing info.
let timingInfo = response.timingInfo
// 5. Let cacheState be responses cache state.
let cacheState = response.cacheState
// 6. If originalURLs scheme is not an HTTP(S) scheme, then return.
if (!urlIsHttpHttpsScheme(originalURL)) {
return
}
// 7. If timingInfo is null, then return.
if (timingInfo === null) {
return
}
// 8. If responses timing allow passed flag is not set, then:
if (!response.timingAllowPassed) {
// 1. Set timingInfo to a the result of creating an opaque timing info for timingInfo.
timingInfo = createOpaqueTimingInfo({
startTime: timingInfo.startTime
})
// 2. Set cacheState to the empty string.
cacheState = ''
}
// 9. Set timingInfos end time to the coarsened shared current time
// given globals relevant settings objects cross-origin isolated
// capability.
// TODO: given globals relevant settings objects cross-origin isolated
// capability?
timingInfo.endTime = coarsenedSharedCurrentTime()
// 10. Set responses timing info to timingInfo.
response.timingInfo = timingInfo
// 11. Mark resource timing for timingInfo, originalURL, initiatorType,
// global, and cacheState.
markResourceTiming(
timingInfo,
originalURL,
initiatorType,
globalThis,
cacheState
)
}
// https://w3c.github.io/resource-timing/#dfn-mark-resource-timing
function markResourceTiming (timingInfo, originalURL, initiatorType, globalThis, cacheState) {
if (nodeMajor > 18 || (nodeMajor === 18 && nodeMinor >= 2)) {
performance.markResourceTiming(timingInfo, originalURL.href, initiatorType, globalThis, cacheState)
}
}
// https://fetch.spec.whatwg.org/#abort-fetch
function abortFetch (p, request, responseObject, error) {
// Note: AbortSignal.reason was added in node v17.2.0
// which would give us an undefined error to reject with.
// Remove this once node v16 is no longer supported.
if (!error) {
error = new DOMException('The operation was aborted.', 'AbortError')
}
// 1. Reject promise with error.
p.reject(error)
// 2. If requests body is not null and is readable, then cancel requests
// body with error.
if (request.body != null && isReadable(request.body?.stream)) {
request.body.stream.cancel(error).catch((err) => {
if (err.code === 'ERR_INVALID_STATE') {
// Node bug?
return
}
throw err
})
}
// 3. If responseObject is null, then return.
if (responseObject == null) {
return
}
// 4. Let response be responseObjects response.
const response = responseObject[kState]
// 5. If responses body is not null and is readable, then error responses
// body with error.
if (response.body != null && isReadable(response.body?.stream)) {
response.body.stream.cancel(error).catch((err) => {
if (err.code === 'ERR_INVALID_STATE') {
// Node bug?
return
}
throw err
})
}
}
// https://fetch.spec.whatwg.org/#fetching
function fetching ({
request,
processRequestBodyChunkLength,
processRequestEndOfBody,
processResponse,
processResponseEndOfBody,
processResponseConsumeBody,
useParallelQueue = false,
dispatcher // undici
}) {
// 1. Let taskDestination be null.
let taskDestination = null
// 2. Let crossOriginIsolatedCapability be false.
let crossOriginIsolatedCapability = false
// 3. If requests client is non-null, then:
if (request.client != null) {
// 1. Set taskDestination to requests clients global object.
taskDestination = request.client.globalObject
// 2. Set crossOriginIsolatedCapability to requests clients cross-origin
// isolated capability.
crossOriginIsolatedCapability =
request.client.crossOriginIsolatedCapability
}
// 4. If useParallelQueue is true, then set taskDestination to the result of
// starting a new parallel queue.
// TODO
// 5. Let timingInfo be a new fetch timing info whose start time and
// post-redirect start time are the coarsened shared current time given
// crossOriginIsolatedCapability.
const currenTime = coarsenedSharedCurrentTime(crossOriginIsolatedCapability)
const timingInfo = createOpaqueTimingInfo({
startTime: currenTime
})
// 6. Let fetchParams be a new fetch params whose
// request is request,
// timing info is timingInfo,
// process request body chunk length is processRequestBodyChunkLength,
// process request end-of-body is processRequestEndOfBody,
// process response is processResponse,
// process response consume body is processResponseConsumeBody,
// process response end-of-body is processResponseEndOfBody,
// task destination is taskDestination,
// and cross-origin isolated capability is crossOriginIsolatedCapability.
const fetchParams = {
controller: new Fetch(dispatcher),
request,
timingInfo,
processRequestBodyChunkLength,
processRequestEndOfBody,
processResponse,
processResponseConsumeBody,
processResponseEndOfBody,
taskDestination,
crossOriginIsolatedCapability
}
// 7. If requests body is a byte sequence, then set requests body to
// requests body as a body.
// NOTE: Since fetching is only called from fetch, body should already be
// extracted.
assert(!request.body || request.body.stream)
// 8. If requests window is "client", then set requests window to requests
// client, if requests clients global object is a Window object; otherwise
// "no-window".
if (request.window === 'client') {
// TODO: What if request.client is null?
request.window =
request.client?.globalObject?.constructor?.name === 'Window'
? request.client
: 'no-window'
}
// 9. If requests origin is "client", then set requests origin to requests
// clients origin.
if (request.origin === 'client') {
// TODO: What if request.client is null?
request.origin = request.client?.origin
}
// 10. If all of the following conditions are true:
// TODO
// 11. If requests policy container is "client", then:
if (request.policyContainer === 'client') {
// 1. If requests client is non-null, then set requests policy
// container to a clone of requests clients policy container. [HTML]
if (request.client != null) {
request.policyContainer = clonePolicyContainer(
request.client.policyContainer
)
} else {
// 2. Otherwise, set requests policy container to a new policy
// container.
request.policyContainer = makePolicyContainer()
}
}
// 12. If requests header list does not contain `Accept`, then:
if (!request.headersList.contains('accept')) {
// 1. Let value be `*/*`.
const value = '*/*'
// 2. A user agent should set value to the first matching statement, if
// any, switching on requests destination:
// "document"
// "frame"
// "iframe"
// `text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8`
// "image"
// `image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5`
// "style"
// `text/css,*/*;q=0.1`
// TODO
// 3. Append `Accept`/value to requests header list.
request.headersList.append('accept', value)
}
// 13. If requests header list does not contain `Accept-Language`, then
// user agents should append `Accept-Language`/an appropriate value to
// requests header list.
if (!request.headersList.contains('accept-language')) {
request.headersList.append('accept-language', '*')
}
// 14. If requests priority is null, then use requests initiator and
// destination appropriately in setting requests priority to a
// user-agent-defined object.
if (request.priority === null) {
// TODO
}
// 15. If request is a subresource request, then:
if (subresourceSet.has(request.destination)) {
// TODO
}
// 16. Run main fetch given fetchParams.
mainFetch(fetchParams)
.catch(err => {
fetchParams.controller.terminate(err)
})
// 17. Return fetchParam's controller
return fetchParams.controller
}
// https://fetch.spec.whatwg.org/#concept-main-fetch
async function mainFetch (fetchParams, recursive = false) {
// 1. Let request be fetchParamss request.
const request = fetchParams.request
// 2. Let response be null.
let response = null
// 3. If requests local-URLs-only flag is set and requests current URL is
// not local, then set response to a network error.
if (request.localURLsOnly && !urlIsLocal(requestCurrentURL(request))) {
response = makeNetworkError('local URLs only')
}
// 4. Run report Content Security Policy violations for request.
// TODO
// 5. Upgrade request to a potentially trustworthy URL, if appropriate.
tryUpgradeRequestToAPotentiallyTrustworthyURL(request)
// 6. If should request be blocked due to a bad port, should fetching request
// be blocked as mixed content, or should request be blocked by Content
// Security Policy returns blocked, then set response to a network error.
if (requestBadPort(request) === 'blocked') {
response = makeNetworkError('bad port')
}
// TODO: should fetching request be blocked as mixed content?
// TODO: should request be blocked by Content Security Policy?
// 7. If requests referrer policy is the empty string, then set requests
// referrer policy to requests policy containers referrer policy.
if (request.referrerPolicy === '') {
request.referrerPolicy = request.policyContainer.referrerPolicy
}
// 8. If requests referrer is not "no-referrer", then set requests
// referrer to the result of invoking determine requests referrer.
if (request.referrer !== 'no-referrer') {
request.referrer = determineRequestsReferrer(request)
}
// 9. Set requests current URLs scheme to "https" if all of the following
// conditions are true:
// - requests current URLs scheme is "http"
// - requests current URLs host is a domain
// - Matching requests current URLs host per Known HSTS Host Domain Name
// Matching results in either a superdomain match with an asserted
// includeSubDomains directive or a congruent match (with or without an
// asserted includeSubDomains directive). [HSTS]
// TODO
// 10. If recursive is false, then run the remaining steps in parallel.
// TODO
// 11. If response is null, then set response to the result of running
// the steps corresponding to the first matching statement:
if (response === null) {
response = await (async () => {
const currentURL = requestCurrentURL(request)
if (
// - requests current URLs origin is same origin with requests origin,
// and requests response tainting is "basic"
(sameOrigin(currentURL, request.url) && request.responseTainting === 'basic') ||
// requests current URLs scheme is "data"
(currentURL.protocol === 'data:') ||
// - requests mode is "navigate" or "websocket"
(request.mode === 'navigate' || request.mode === 'websocket')
) {
// 1. Set requests response tainting to "basic".
request.responseTainting = 'basic'
// 2. Return the result of running scheme fetch given fetchParams.
return await schemeFetch(fetchParams)
}
// requests mode is "same-origin"
if (request.mode === 'same-origin') {
// 1. Return a network error.
return makeNetworkError('request mode cannot be "same-origin"')
}
// requests mode is "no-cors"
if (request.mode === 'no-cors') {
// 1. If requests redirect mode is not "follow", then return a network
// error.
if (request.redirect !== 'follow') {
return makeNetworkError(
'redirect mode cannot be "follow" for "no-cors" request'
)
}
// 2. Set requests response tainting to "opaque".
request.responseTainting = 'opaque'
// 3. Return the result of running scheme fetch given fetchParams.
return await schemeFetch(fetchParams)
}
// requests current URLs scheme is not an HTTP(S) scheme
if (!urlIsHttpHttpsScheme(requestCurrentURL(request))) {
// Return a network error.
return makeNetworkError('URL scheme must be a HTTP(S) scheme')
}
// - requests use-CORS-preflight flag is set
// - requests unsafe-request flag is set and either requests method is
// not a CORS-safelisted method or CORS-unsafe request-header names with
// requests header list is not empty
// 1. Set requests response tainting to "cors".
// 2. Let corsWithPreflightResponse be the result of running HTTP fetch
// given fetchParams and true.
// 3. If corsWithPreflightResponse is a network error, then clear cache
// entries using request.
// 4. Return corsWithPreflightResponse.
// TODO
// Otherwise
// 1. Set requests response tainting to "cors".
request.responseTainting = 'cors'
// 2. Return the result of running HTTP fetch given fetchParams.
return await httpFetch(fetchParams)
})()
}
// 12. If recursive is true, then return response.
if (recursive) {
return response
}
// 13. If response is not a network error and response is not a filtered
// response, then:
if (response.status !== 0 && !response.internalResponse) {
// If requests response tainting is "cors", then:
if (request.responseTainting === 'cors') {
// 1. Let headerNames be the result of extracting header list values
// given `Access-Control-Expose-Headers` and responses header list.
// TODO
// 2. If requests credentials mode is not "include" and headerNames
// contains `*`, then set responses CORS-exposed header-name list to
// all unique header names in responses header list.
// TODO
// 3. Otherwise, if headerNames is not null or failure, then set
// responses CORS-exposed header-name list to headerNames.
// TODO
}
// Set response to the following filtered response with response as its
// internal response, depending on requests response tainting:
if (request.responseTainting === 'basic') {
response = filterResponse(response, 'basic')
} else if (request.responseTainting === 'cors') {
response = filterResponse(response, 'cors')
} else if (request.responseTainting === 'opaque') {
response = filterResponse(response, 'opaque')
} else {
assert(false)
}
}
// 14. Let internalResponse be response, if response is a network error,
// and responses internal response otherwise.
let internalResponse =
response.status === 0 ? response : response.internalResponse
// 15. If internalResponses URL list is empty, then set it to a clone of
// requests URL list.
if (internalResponse.urlList.length === 0) {
internalResponse.urlList.push(...request.urlList)
}
// 16. If requests timing allow failed flag is unset, then set
// internalResponses timing allow passed flag.
if (!request.timingAllowFailed) {
response.timingAllowPassed = true
}
// 17. If response is not a network error and any of the following returns
// blocked
// - should internalResponse to request be blocked as mixed content
// - should internalResponse to request be blocked by Content Security Policy
// - should internalResponse to request be blocked due to its MIME type
// - should internalResponse to request be blocked due to nosniff
// TODO
// 18. If responses type is "opaque", internalResponses status is 206,
// internalResponses range-requested flag is set, and requests header
// list does not contain `Range`, then set response and internalResponse
// to a network error.
if (
response.type === 'opaque' &&
internalResponse.status === 206 &&
internalResponse.rangeRequested &&
!request.headers.contains('range')
) {
response = internalResponse = makeNetworkError()
}
// 19. If response is not a network error and either requests method is
// `HEAD` or `CONNECT`, or internalResponses status is a null body status,
// set internalResponses body to null and disregard any enqueuing toward
// it (if any).
if (
response.status !== 0 &&
(request.method === 'HEAD' ||
request.method === 'CONNECT' ||
nullBodyStatus.includes(internalResponse.status))
) {
internalResponse.body = null
fetchParams.controller.dump = true
}
// 20. If requests integrity metadata is not the empty string, then:
if (request.integrity) {
// 1. Let processBodyError be this step: run fetch finale given fetchParams
// and a network error.
const processBodyError = (reason) =>
fetchFinale(fetchParams, makeNetworkError(reason))
// 2. If requests response tainting is "opaque", or responses body is null,
// then run processBodyError and abort these steps.
if (request.responseTainting === 'opaque' || response.body == null) {
processBodyError(response.error)
return
}
// 3. Let processBody given bytes be these steps:
const processBody = (bytes) => {
// 1. If bytes do not match requests integrity metadata,
// then run processBodyError and abort these steps. [SRI]
if (!bytesMatch(bytes, request.integrity)) {
processBodyError('integrity mismatch')
return
}
// 2. Set responses body to bytes as a body.
response.body = safelyExtractBody(bytes)[0]
// 3. Run fetch finale given fetchParams and response.
fetchFinale(fetchParams, response)
}
// 4. Fully read responses body given processBody and processBodyError.
await fullyReadBody(response.body, processBody, processBodyError)
} else {
// 21. Otherwise, run fetch finale given fetchParams and response.
fetchFinale(fetchParams, response)
}
}
// https://fetch.spec.whatwg.org/#concept-scheme-fetch
// given a fetch params fetchParams
function schemeFetch (fetchParams) {
// Note: since the connection is destroyed on redirect, which sets fetchParams to a
// cancelled state, we do not want this condition to trigger *unless* there have been
// no redirects. See https://github.com/nodejs/undici/issues/1776
// 1. If fetchParams is canceled, then return the appropriate network error for fetchParams.
if (isCancelled(fetchParams) && fetchParams.request.redirectCount === 0) {
return Promise.resolve(makeAppropriateNetworkError(fetchParams))
}
// 2. Let request be fetchParamss request.
const { request } = fetchParams
const { protocol: scheme } = requestCurrentURL(request)
// 3. Switch on requests current URLs scheme and run the associated steps:
switch (scheme) {
case 'about:': {
// If requests current URLs path is the string "blank", then return a new response
// whose status message is `OK`, header list is « (`Content-Type`, `text/html;charset=utf-8`) »,
// and body is the empty byte sequence as a body.
// Otherwise, return a network error.
return Promise.resolve(makeNetworkError('about scheme is not supported'))
}
case 'blob:': {
if (!resolveObjectURL) {
resolveObjectURL = require('buffer').resolveObjectURL
}
// 1. Let blobURLEntry be requests current URLs blob URL entry.
const blobURLEntry = requestCurrentURL(request)
// https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L52-L56
// Buffer.resolveObjectURL does not ignore URL queries.
if (blobURLEntry.search.length !== 0) {
return Promise.resolve(makeNetworkError('NetworkError when attempting to fetch resource.'))
}
const blobURLEntryObject = resolveObjectURL(blobURLEntry.toString())
// 2. If requests method is not `GET`, blobURLEntry is null, or blobURLEntrys
// object is not a Blob object, then return a network error.
if (request.method !== 'GET' || !isBlobLike(blobURLEntryObject)) {
return Promise.resolve(makeNetworkError('invalid method'))
}
// 3. Let bodyWithType be the result of safely extracting blobURLEntrys object.
const bodyWithType = safelyExtractBody(blobURLEntryObject)
// 4. Let body be bodyWithTypes body.
const body = bodyWithType[0]
// 5. Let length be bodys length, serialized and isomorphic encoded.
const length = isomorphicEncode(`${body.length}`)
// 6. Let type be bodyWithTypes type if it is non-null; otherwise the empty byte sequence.
const type = bodyWithType[1] ?? ''
// 7. Return a new response whose status message is `OK`, header list is
// « (`Content-Length`, length), (`Content-Type`, type) », and body is body.
const response = makeResponse({
statusText: 'OK',
headersList: [
['content-length', { name: 'Content-Length', value: length }],
['content-type', { name: 'Content-Type', value: type }]
]
})
response.body = body
return Promise.resolve(response)
}
case 'data:': {
// 1. Let dataURLStruct be the result of running the
// data: URL processor on requests current URL.
const currentURL = requestCurrentURL(request)
const dataURLStruct = dataURLProcessor(currentURL)
// 2. If dataURLStruct is failure, then return a
// network error.
if (dataURLStruct === 'failure') {
return Promise.resolve(makeNetworkError('failed to fetch the data URL'))
}
// 3. Let mimeType be dataURLStructs MIME type, serialized.
const mimeType = serializeAMimeType(dataURLStruct.mimeType)
// 4. Return a response whose status message is `OK`,
// header list is « (`Content-Type`, mimeType) »,
// and body is dataURLStructs body as a body.
return Promise.resolve(makeResponse({
statusText: 'OK',
headersList: [
['content-type', { name: 'Content-Type', value: mimeType }]
],
body: safelyExtractBody(dataURLStruct.body)[0]
}))
}
case 'file:': {
// For now, unfortunate as it is, file URLs are left as an exercise for the reader.
// When in doubt, return a network error.
return Promise.resolve(makeNetworkError('not implemented... yet...'))
}
case 'http:':
case 'https:': {
// Return the result of running HTTP fetch given fetchParams.
return httpFetch(fetchParams)
.catch((err) => makeNetworkError(err))
}
default: {
return Promise.resolve(makeNetworkError('unknown scheme'))
}
}
}
// https://fetch.spec.whatwg.org/#finalize-response
function finalizeResponse (fetchParams, response) {
// 1. Set fetchParamss requests done flag.
fetchParams.request.done = true
// 2, If fetchParamss process response done is not null, then queue a fetch
// task to run fetchParamss process response done given response, with
// fetchParamss task destination.
if (fetchParams.processResponseDone != null) {
queueMicrotask(() => fetchParams.processResponseDone(response))
}
}
// https://fetch.spec.whatwg.org/#fetch-finale
function fetchFinale (fetchParams, response) {
// 1. If response is a network error, then:
if (response.type === 'error') {
// 1. Set responses URL list to « fetchParamss requests URL list[0] ».
response.urlList = [fetchParams.request.urlList[0]]
// 2. Set responses timing info to the result of creating an opaque timing
// info for fetchParamss timing info.
response.timingInfo = createOpaqueTimingInfo({
startTime: fetchParams.timingInfo.startTime
})
}
// 2. Let processResponseEndOfBody be the following steps:
const processResponseEndOfBody = () => {
// 1. Set fetchParamss requests done flag.
fetchParams.request.done = true
// If fetchParamss process response end-of-body is not null,
// then queue a fetch task to run fetchParamss process response
// end-of-body given response with fetchParamss task destination.
if (fetchParams.processResponseEndOfBody != null) {
queueMicrotask(() => fetchParams.processResponseEndOfBody(response))
}
}
// 3. If fetchParamss process response is non-null, then queue a fetch task
// to run fetchParamss process response given response, with fetchParamss
// task destination.
if (fetchParams.processResponse != null) {
queueMicrotask(() => fetchParams.processResponse(response))
}
// 4. If responses body is null, then run processResponseEndOfBody.
if (response.body == null) {
processResponseEndOfBody()
} else {
// 5. Otherwise:
// 1. Let transformStream be a new a TransformStream.
// 2. Let identityTransformAlgorithm be an algorithm which, given chunk,
// enqueues chunk in transformStream.
const identityTransformAlgorithm = (chunk, controller) => {
controller.enqueue(chunk)
}
// 3. Set up transformStream with transformAlgorithm set to identityTransformAlgorithm
// and flushAlgorithm set to processResponseEndOfBody.
const transformStream = new TransformStream({
start () {},
transform: identityTransformAlgorithm,
flush: processResponseEndOfBody
}, {
size () {
return 1
}
}, {
size () {
return 1
}
})
// 4. Set responses body to the result of piping responses body through transformStream.
response.body = { stream: response.body.stream.pipeThrough(transformStream) }
}
// 6. If fetchParamss process response consume body is non-null, then:
if (fetchParams.processResponseConsumeBody != null) {
// 1. Let processBody given nullOrBytes be this step: run fetchParamss
// process response consume body given response and nullOrBytes.
const processBody = (nullOrBytes) => fetchParams.processResponseConsumeBody(response, nullOrBytes)
// 2. Let processBodyError be this step: run fetchParamss process
// response consume body given response and failure.
const processBodyError = (failure) => fetchParams.processResponseConsumeBody(response, failure)
// 3. If responses body is null, then queue a fetch task to run processBody
// given null, with fetchParamss task destination.
if (response.body == null) {
queueMicrotask(() => processBody(null))
} else {
// 4. Otherwise, fully read responses body given processBody, processBodyError,
// and fetchParamss task destination.
return fullyReadBody(response.body, processBody, processBodyError)
}
return Promise.resolve()
}
}
// https://fetch.spec.whatwg.org/#http-fetch
async function httpFetch (fetchParams) {
// 1. Let request be fetchParamss request.
const request = fetchParams.request
// 2. Let response be null.
let response = null
// 3. Let actualResponse be null.
let actualResponse = null
// 4. Let timingInfo be fetchParamss timing info.
const timingInfo = fetchParams.timingInfo
// 5. If requests service-workers mode is "all", then:
if (request.serviceWorkers === 'all') {
// TODO
}
// 6. If response is null, then:
if (response === null) {
// 1. If makeCORSPreflight is true and one of these conditions is true:
// TODO
// 2. If requests redirect mode is "follow", then set requests
// service-workers mode to "none".
if (request.redirect === 'follow') {
request.serviceWorkers = 'none'
}
// 3. Set response and actualResponse to the result of running
// HTTP-network-or-cache fetch given fetchParams.
actualResponse = response = await httpNetworkOrCacheFetch(fetchParams)
// 4. If requests response tainting is "cors" and a CORS check
// for request and response returns failure, then return a network error.
if (
request.responseTainting === 'cors' &&
corsCheck(request, response) === 'failure'
) {
return makeNetworkError('cors failure')
}
// 5. If the TAO check for request and response returns failure, then set
// requests timing allow failed flag.
if (TAOCheck(request, response) === 'failure') {
request.timingAllowFailed = true
}
}
// 7. If either requests response tainting or responses type
// is "opaque", and the cross-origin resource policy check with
// requests origin, requests client, requests destination,
// and actualResponse returns blocked, then return a network error.
if (
(request.responseTainting === 'opaque' || response.type === 'opaque') &&
crossOriginResourcePolicyCheck(
request.origin,
request.client,
request.destination,
actualResponse
) === 'blocked'
) {
return makeNetworkError('blocked')
}
// 8. If actualResponses status is a redirect status, then:
if (redirectStatusSet.has(actualResponse.status)) {
// 1. If actualResponses status is not 303, requests body is not null,
// and the connection uses HTTP/2, then user agents may, and are even
// encouraged to, transmit an RST_STREAM frame.
// See, https://github.com/whatwg/fetch/issues/1288
if (request.redirect !== 'manual') {
fetchParams.controller.connection.destroy()
}
// 2. Switch on requests redirect mode:
if (request.redirect === 'error') {
// Set response to a network error.
response = makeNetworkError('unexpected redirect')
} else if (request.redirect === 'manual') {
// Set response to an opaque-redirect filtered response whose internal
// response is actualResponse.
// NOTE(spec): On the web this would return an `opaqueredirect` response,
// but that doesn't make sense server side.
// See https://github.com/nodejs/undici/issues/1193.
response = actualResponse
} else if (request.redirect === 'follow') {
// Set response to the result of running HTTP-redirect fetch given
// fetchParams and response.
response = await httpRedirectFetch(fetchParams, response)
} else {
assert(false)
}
}
// 9. Set responses timing info to timingInfo.
response.timingInfo = timingInfo
// 10. Return response.
return response
}
// https://fetch.spec.whatwg.org/#http-redirect-fetch
function httpRedirectFetch (fetchParams, response) {
// 1. Let request be fetchParamss request.
const request = fetchParams.request
// 2. Let actualResponse be response, if response is not a filtered response,
// and responses internal response otherwise.
const actualResponse = response.internalResponse
? response.internalResponse
: response
// 3. Let locationURL be actualResponses location URL given requests current
// URLs fragment.
let locationURL
try {
locationURL = responseLocationURL(
actualResponse,
requestCurrentURL(request).hash
)
// 4. If locationURL is null, then return response.
if (locationURL == null) {
return response
}
} catch (err) {
// 5. If locationURL is failure, then return a network error.
return Promise.resolve(makeNetworkError(err))
}
// 6. If locationURLs scheme is not an HTTP(S) scheme, then return a network
// error.
if (!urlIsHttpHttpsScheme(locationURL)) {
return Promise.resolve(makeNetworkError('URL scheme must be a HTTP(S) scheme'))
}
// 7. If requests redirect count is 20, then return a network error.
if (request.redirectCount === 20) {
return Promise.resolve(makeNetworkError('redirect count exceeded'))
}
// 8. Increase requests redirect count by 1.
request.redirectCount += 1
// 9. If requests mode is "cors", locationURL includes credentials, and
// requests origin is not same origin with locationURLs origin, then return
// a network error.
if (
request.mode === 'cors' &&
(locationURL.username || locationURL.password) &&
!sameOrigin(request, locationURL)
) {
return Promise.resolve(makeNetworkError('cross origin not allowed for request mode "cors"'))
}
// 10. If requests response tainting is "cors" and locationURL includes
// credentials, then return a network error.
if (
request.responseTainting === 'cors' &&
(locationURL.username || locationURL.password)
) {
return Promise.resolve(makeNetworkError(
'URL cannot contain credentials for request mode "cors"'
))
}
// 11. If actualResponses status is not 303, requests body is non-null,
// and requests bodys source is null, then return a network error.
if (
actualResponse.status !== 303 &&
request.body != null &&
request.body.source == null
) {
return Promise.resolve(makeNetworkError())
}
// 12. If one of the following is true
// - actualResponses status is 301 or 302 and requests method is `POST`
// - actualResponses status is 303 and requests method is not `GET` or `HEAD`
if (
([301, 302].includes(actualResponse.status) && request.method === 'POST') ||
(actualResponse.status === 303 &&
!GET_OR_HEAD.includes(request.method))
) {
// then:
// 1. Set requests method to `GET` and requests body to null.
request.method = 'GET'
request.body = null
// 2. For each headerName of request-body-header name, delete headerName from
// requests header list.
for (const headerName of requestBodyHeader) {
request.headersList.delete(headerName)
}
}
// 13. If requests current URLs origin is not same origin with locationURLs
// origin, then for each headerName of CORS non-wildcard request-header name,
// delete headerName from requests header list.
if (!sameOrigin(requestCurrentURL(request), locationURL)) {
// https://fetch.spec.whatwg.org/#cors-non-wildcard-request-header-name
request.headersList.delete('authorization')
// "Cookie" and "Host" are forbidden request-headers, which undici doesn't implement.
request.headersList.delete('cookie')
request.headersList.delete('host')
}
// 14. If requests body is non-null, then set requests body to the first return
// value of safely extracting requests bodys source.
if (request.body != null) {
assert(request.body.source != null)
request.body = safelyExtractBody(request.body.source)[0]
}
// 15. Let timingInfo be fetchParamss timing info.
const timingInfo = fetchParams.timingInfo
// 16. Set timingInfos redirect end time and post-redirect start time to the
// coarsened shared current time given fetchParamss cross-origin isolated
// capability.
timingInfo.redirectEndTime = timingInfo.postRedirectStartTime =
coarsenedSharedCurrentTime(fetchParams.crossOriginIsolatedCapability)
// 17. If timingInfos redirect start time is 0, then set timingInfos
// redirect start time to timingInfos start time.
if (timingInfo.redirectStartTime === 0) {
timingInfo.redirectStartTime = timingInfo.startTime
}
// 18. Append locationURL to requests URL list.
request.urlList.push(locationURL)
// 19. Invoke set requests referrer policy on redirect on request and
// actualResponse.
setRequestReferrerPolicyOnRedirect(request, actualResponse)
// 20. Return the result of running main fetch given fetchParams and true.
return mainFetch(fetchParams, true)
}
// https://fetch.spec.whatwg.org/#http-network-or-cache-fetch
async function httpNetworkOrCacheFetch (
fetchParams,
isAuthenticationFetch = false,
isNewConnectionFetch = false
) {
// 1. Let request be fetchParamss request.
const request = fetchParams.request
// 2. Let httpFetchParams be null.
let httpFetchParams = null
// 3. Let httpRequest be null.
let httpRequest = null
// 4. Let response be null.
let response = null
// 5. Let storedResponse be null.
// TODO: cache
// 6. Let httpCache be null.
const httpCache = null
// 7. Let the revalidatingFlag be unset.
const revalidatingFlag = false
// 8. Run these steps, but abort when the ongoing fetch is terminated:
// 1. If requests window is "no-window" and requests redirect mode is
// "error", then set httpFetchParams to fetchParams and httpRequest to
// request.
if (request.window === 'no-window' && request.redirect === 'error') {
httpFetchParams = fetchParams
httpRequest = request
} else {
// Otherwise:
// 1. Set httpRequest to a clone of request.
httpRequest = makeRequest(request)
// 2. Set httpFetchParams to a copy of fetchParams.
httpFetchParams = { ...fetchParams }
// 3. Set httpFetchParamss request to httpRequest.
httpFetchParams.request = httpRequest
}
// 3. Let includeCredentials be true if one of
const includeCredentials =
request.credentials === 'include' ||
(request.credentials === 'same-origin' &&
request.responseTainting === 'basic')
// 4. Let contentLength be httpRequests bodys length, if httpRequests
// body is non-null; otherwise null.
const contentLength = httpRequest.body ? httpRequest.body.length : null
// 5. Let contentLengthHeaderValue be null.
let contentLengthHeaderValue = null
// 6. If httpRequests body is null and httpRequests method is `POST` or
// `PUT`, then set contentLengthHeaderValue to `0`.
if (
httpRequest.body == null &&
['POST', 'PUT'].includes(httpRequest.method)
) {
contentLengthHeaderValue = '0'
}
// 7. If contentLength is non-null, then set contentLengthHeaderValue to
// contentLength, serialized and isomorphic encoded.
if (contentLength != null) {
contentLengthHeaderValue = isomorphicEncode(`${contentLength}`)
}
// 8. If contentLengthHeaderValue is non-null, then append
// `Content-Length`/contentLengthHeaderValue to httpRequests header
// list.
if (contentLengthHeaderValue != null) {
httpRequest.headersList.append('content-length', contentLengthHeaderValue)
}
// 9. If contentLengthHeaderValue is non-null, then append (`Content-Length`,
// contentLengthHeaderValue) to httpRequests header list.
// 10. If contentLength is non-null and httpRequests keepalive is true,
// then:
if (contentLength != null && httpRequest.keepalive) {
// NOTE: keepalive is a noop outside of browser context.
}
// 11. If httpRequests referrer is a URL, then append
// `Referer`/httpRequests referrer, serialized and isomorphic encoded,
// to httpRequests header list.
if (httpRequest.referrer instanceof URL) {
httpRequest.headersList.append('referer', isomorphicEncode(httpRequest.referrer.href))
}
// 12. Append a request `Origin` header for httpRequest.
appendRequestOriginHeader(httpRequest)
// 13. Append the Fetch metadata headers for httpRequest. [FETCH-METADATA]
appendFetchMetadata(httpRequest)
// 14. If httpRequests header list does not contain `User-Agent`, then
// user agents should append `User-Agent`/default `User-Agent` value to
// httpRequests header list.
if (!httpRequest.headersList.contains('user-agent')) {
httpRequest.headersList.append('user-agent', typeof esbuildDetection === 'undefined' ? 'undici' : 'node')
}
// 15. If httpRequests cache mode is "default" and httpRequests header
// list contains `If-Modified-Since`, `If-None-Match`,
// `If-Unmodified-Since`, `If-Match`, or `If-Range`, then set
// httpRequests cache mode to "no-store".
if (
httpRequest.cache === 'default' &&
(httpRequest.headersList.contains('if-modified-since') ||
httpRequest.headersList.contains('if-none-match') ||
httpRequest.headersList.contains('if-unmodified-since') ||
httpRequest.headersList.contains('if-match') ||
httpRequest.headersList.contains('if-range'))
) {
httpRequest.cache = 'no-store'
}
// 16. If httpRequests cache mode is "no-cache", httpRequests prevent
// no-cache cache-control header modification flag is unset, and
// httpRequests header list does not contain `Cache-Control`, then append
// `Cache-Control`/`max-age=0` to httpRequests header list.
if (
httpRequest.cache === 'no-cache' &&
!httpRequest.preventNoCacheCacheControlHeaderModification &&
!httpRequest.headersList.contains('cache-control')
) {
httpRequest.headersList.append('cache-control', 'max-age=0')
}
// 17. If httpRequests cache mode is "no-store" or "reload", then:
if (httpRequest.cache === 'no-store' || httpRequest.cache === 'reload') {
// 1. If httpRequests header list does not contain `Pragma`, then append
// `Pragma`/`no-cache` to httpRequests header list.
if (!httpRequest.headersList.contains('pragma')) {
httpRequest.headersList.append('pragma', 'no-cache')
}
// 2. If httpRequests header list does not contain `Cache-Control`,
// then append `Cache-Control`/`no-cache` to httpRequests header list.
if (!httpRequest.headersList.contains('cache-control')) {
httpRequest.headersList.append('cache-control', 'no-cache')
}
}
// 18. If httpRequests header list contains `Range`, then append
// `Accept-Encoding`/`identity` to httpRequests header list.
if (httpRequest.headersList.contains('range')) {
httpRequest.headersList.append('accept-encoding', 'identity')
}
// 19. Modify httpRequests header list per HTTP. Do not append a given
// header if httpRequests header list contains that headers name.
// TODO: https://github.com/whatwg/fetch/issues/1285#issuecomment-896560129
if (!httpRequest.headersList.contains('accept-encoding')) {
if (urlHasHttpsScheme(requestCurrentURL(httpRequest))) {
httpRequest.headersList.append('accept-encoding', 'br, gzip, deflate')
} else {
httpRequest.headersList.append('accept-encoding', 'gzip, deflate')
}
}
httpRequest.headersList.delete('host')
// 20. If includeCredentials is true, then:
if (includeCredentials) {
// 1. If the user agent is not configured to block cookies for httpRequest
// (see section 7 of [COOKIES]), then:
// TODO: credentials
// 2. If httpRequests header list does not contain `Authorization`, then:
// TODO: credentials
}
// 21. If theres a proxy-authentication entry, use it as appropriate.
// TODO: proxy-authentication
// 22. Set httpCache to the result of determining the HTTP cache
// partition, given httpRequest.
// TODO: cache
// 23. If httpCache is null, then set httpRequests cache mode to
// "no-store".
if (httpCache == null) {
httpRequest.cache = 'no-store'
}
// 24. If httpRequests cache mode is neither "no-store" nor "reload",
// then:
if (httpRequest.mode !== 'no-store' && httpRequest.mode !== 'reload') {
// TODO: cache
}
// 9. If aborted, then return the appropriate network error for fetchParams.
// TODO
// 10. If response is null, then:
if (response == null) {
// 1. If httpRequests cache mode is "only-if-cached", then return a
// network error.
if (httpRequest.mode === 'only-if-cached') {
return makeNetworkError('only if cached')
}
// 2. Let forwardResponse be the result of running HTTP-network fetch
// given httpFetchParams, includeCredentials, and isNewConnectionFetch.
const forwardResponse = await httpNetworkFetch(
httpFetchParams,
includeCredentials,
isNewConnectionFetch
)
// 3. If httpRequests method is unsafe and forwardResponses status is
// in the range 200 to 399, inclusive, invalidate appropriate stored
// responses in httpCache, as per the "Invalidation" chapter of HTTP
// Caching, and set storedResponse to null. [HTTP-CACHING]
if (
!safeMethodsSet.has(httpRequest.method) &&
forwardResponse.status >= 200 &&
forwardResponse.status <= 399
) {
// TODO: cache
}
// 4. If the revalidatingFlag is set and forwardResponses status is 304,
// then:
if (revalidatingFlag && forwardResponse.status === 304) {
// TODO: cache
}
// 5. If response is null, then:
if (response == null) {
// 1. Set response to forwardResponse.
response = forwardResponse
// 2. Store httpRequest and forwardResponse in httpCache, as per the
// "Storing Responses in Caches" chapter of HTTP Caching. [HTTP-CACHING]
// TODO: cache
}
}
// 11. Set responses URL list to a clone of httpRequests URL list.
response.urlList = [...httpRequest.urlList]
// 12. If httpRequests header list contains `Range`, then set responses
// range-requested flag.
if (httpRequest.headersList.contains('range')) {
response.rangeRequested = true
}
// 13. Set responses request-includes-credentials to includeCredentials.
response.requestIncludesCredentials = includeCredentials
// 14. If responses status is 401, httpRequests response tainting is not
// "cors", includeCredentials is true, and requests window is an environment
// settings object, then:
// TODO
// 15. If responses status is 407, then:
if (response.status === 407) {
// 1. If requests window is "no-window", then return a network error.
if (request.window === 'no-window') {
return makeNetworkError()
}
// 2. ???
// 3. If fetchParams is canceled, then return the appropriate network error for fetchParams.
if (isCancelled(fetchParams)) {
return makeAppropriateNetworkError(fetchParams)
}
// 4. Prompt the end user as appropriate in requests window and store
// the result as a proxy-authentication entry. [HTTP-AUTH]
// TODO: Invoke some kind of callback?
// 5. Set response to the result of running HTTP-network-or-cache fetch given
// fetchParams.
// TODO
return makeNetworkError('proxy authentication required')
}
// 16. If all of the following are true
if (
// responses status is 421
response.status === 421 &&
// isNewConnectionFetch is false
!isNewConnectionFetch &&
// requests body is null, or requests body is non-null and requests bodys source is non-null
(request.body == null || request.body.source != null)
) {
// then:
// 1. If fetchParams is canceled, then return the appropriate network error for fetchParams.
if (isCancelled(fetchParams)) {
return makeAppropriateNetworkError(fetchParams)
}
// 2. Set response to the result of running HTTP-network-or-cache
// fetch given fetchParams, isAuthenticationFetch, and true.
// TODO (spec): The spec doesn't specify this but we need to cancel
// the active response before we can start a new one.
// https://github.com/whatwg/fetch/issues/1293
fetchParams.controller.connection.destroy()
response = await httpNetworkOrCacheFetch(
fetchParams,
isAuthenticationFetch,
true
)
}
// 17. If isAuthenticationFetch is true, then create an authentication entry
if (isAuthenticationFetch) {
// TODO
}
// 18. Return response.
return response
}
// https://fetch.spec.whatwg.org/#http-network-fetch
async function httpNetworkFetch (
fetchParams,
includeCredentials = false,
forceNewConnection = false
) {
assert(!fetchParams.controller.connection || fetchParams.controller.connection.destroyed)
fetchParams.controller.connection = {
abort: null,
destroyed: false,
destroy (err) {
if (!this.destroyed) {
this.destroyed = true
this.abort?.(err ?? new DOMException('The operation was aborted.', 'AbortError'))
}
}
}
// 1. Let request be fetchParamss request.
const request = fetchParams.request
// 2. Let response be null.
let response = null
// 3. Let timingInfo be fetchParamss timing info.
const timingInfo = fetchParams.timingInfo
// 4. Let httpCache be the result of determining the HTTP cache partition,
// given request.
// TODO: cache
const httpCache = null
// 5. If httpCache is null, then set requests cache mode to "no-store".
if (httpCache == null) {
request.cache = 'no-store'
}
// 6. Let networkPartitionKey be the result of determining the network
// partition key given request.
// TODO
// 7. Let newConnection be "yes" if forceNewConnection is true; otherwise
// "no".
const newConnection = forceNewConnection ? 'yes' : 'no' // eslint-disable-line no-unused-vars
// 8. Switch on requests mode:
if (request.mode === 'websocket') {
// Let connection be the result of obtaining a WebSocket connection,
// given requests current URL.
// TODO
} else {
// Let connection be the result of obtaining a connection, given
// networkPartitionKey, requests current URLs origin,
// includeCredentials, and forceNewConnection.
// TODO
}
// 9. Run these steps, but abort when the ongoing fetch is terminated:
// 1. If connection is failure, then return a network error.
// 2. Set timingInfos final connection timing info to the result of
// calling clamp and coarsen connection timing info with connections
// timing info, timingInfos post-redirect start time, and fetchParamss
// cross-origin isolated capability.
// 3. If connection is not an HTTP/2 connection, requests body is non-null,
// and requests bodys source is null, then append (`Transfer-Encoding`,
// `chunked`) to requests header list.
// 4. Set timingInfos final network-request start time to the coarsened
// shared current time given fetchParamss cross-origin isolated
// capability.
// 5. Set response to the result of making an HTTP request over connection
// using request with the following caveats:
// - Follow the relevant requirements from HTTP. [HTTP] [HTTP-SEMANTICS]
// [HTTP-COND] [HTTP-CACHING] [HTTP-AUTH]
// - If requests body is non-null, and requests bodys source is null,
// then the user agent may have a buffer of up to 64 kibibytes and store
// a part of requests body in that buffer. If the user agent reads from
// requests body beyond that buffers size and the user agent needs to
// resend request, then instead return a network error.
// - Set timingInfos final network-response start time to the coarsened
// shared current time given fetchParamss cross-origin isolated capability,
// immediately after the user agents HTTP parser receives the first byte
// of the response (e.g., frame header bytes for HTTP/2 or response status
// line for HTTP/1.x).
// - Wait until all the headers are transmitted.
// - Any responses whose status is in the range 100 to 199, inclusive,
// and is not 101, are to be ignored, except for the purposes of setting
// timingInfos final network-response start time above.
// - If requests header list contains `Transfer-Encoding`/`chunked` and
// response is transferred via HTTP/1.0 or older, then return a network
// error.
// - If the HTTP request results in a TLS client certificate dialog, then:
// 1. If requests window is an environment settings object, make the
// dialog available in requests window.
// 2. Otherwise, return a network error.
// To transmit requests body body, run these steps:
let requestBody = null
// 1. If body is null and fetchParamss process request end-of-body is
// non-null, then queue a fetch task given fetchParamss process request
// end-of-body and fetchParamss task destination.
if (request.body == null && fetchParams.processRequestEndOfBody) {
queueMicrotask(() => fetchParams.processRequestEndOfBody())
} else if (request.body != null) {
// 2. Otherwise, if body is non-null:
// 1. Let processBodyChunk given bytes be these steps:
const processBodyChunk = async function * (bytes) {
// 1. If the ongoing fetch is terminated, then abort these steps.
if (isCancelled(fetchParams)) {
return
}
// 2. Run this step in parallel: transmit bytes.
yield bytes
// 3. If fetchParamss process request body is non-null, then run
// fetchParamss process request body given bytess length.
fetchParams.processRequestBodyChunkLength?.(bytes.byteLength)
}
// 2. Let processEndOfBody be these steps:
const processEndOfBody = () => {
// 1. If fetchParams is canceled, then abort these steps.
if (isCancelled(fetchParams)) {
return
}
// 2. If fetchParamss process request end-of-body is non-null,
// then run fetchParamss process request end-of-body.
if (fetchParams.processRequestEndOfBody) {
fetchParams.processRequestEndOfBody()
}
}
// 3. Let processBodyError given e be these steps:
const processBodyError = (e) => {
// 1. If fetchParams is canceled, then abort these steps.
if (isCancelled(fetchParams)) {
return
}
// 2. If e is an "AbortError" DOMException, then abort fetchParamss controller.
if (e.name === 'AbortError') {
fetchParams.controller.abort()
} else {
fetchParams.controller.terminate(e)
}
}
// 4. Incrementally read requests body given processBodyChunk, processEndOfBody,
// processBodyError, and fetchParamss task destination.
requestBody = (async function * () {
try {
for await (const bytes of request.body.stream) {
yield * processBodyChunk(bytes)
}
processEndOfBody()
} catch (err) {
processBodyError(err)
}
})()
}
try {
// socket is only provided for websockets
const { body, status, statusText, headersList, socket } = await dispatch({ body: requestBody })
if (socket) {
response = makeResponse({ status, statusText, headersList, socket })
} else {
const iterator = body[Symbol.asyncIterator]()
fetchParams.controller.next = () => iterator.next()
response = makeResponse({ status, statusText, headersList })
}
} catch (err) {
// 10. If aborted, then:
if (err.name === 'AbortError') {
// 1. If connection uses HTTP/2, then transmit an RST_STREAM frame.
fetchParams.controller.connection.destroy()
// 2. Return the appropriate network error for fetchParams.
return makeAppropriateNetworkError(fetchParams, err)
}
return makeNetworkError(err)
}
// 11. Let pullAlgorithm be an action that resumes the ongoing fetch
// if it is suspended.
const pullAlgorithm = () => {
fetchParams.controller.resume()
}
// 12. Let cancelAlgorithm be an algorithm that aborts fetchParamss
// controller with reason, given reason.
const cancelAlgorithm = (reason) => {
fetchParams.controller.abort(reason)
}
// 13. Let highWaterMark be a non-negative, non-NaN number, chosen by
// the user agent.
// TODO
// 14. Let sizeAlgorithm be an algorithm that accepts a chunk object
// and returns a non-negative, non-NaN, non-infinite number, chosen by the user agent.
// TODO
// 15. Let stream be a new ReadableStream.
// 16. Set up stream with pullAlgorithm set to pullAlgorithm,
// cancelAlgorithm set to cancelAlgorithm, highWaterMark set to
// highWaterMark, and sizeAlgorithm set to sizeAlgorithm.
if (!ReadableStream) {
ReadableStream = require('stream/web').ReadableStream
}
const stream = new ReadableStream(
{
async start (controller) {
fetchParams.controller.controller = controller
},
async pull (controller) {
await pullAlgorithm(controller)
},
async cancel (reason) {
await cancelAlgorithm(reason)
}
},
{
highWaterMark: 0,
size () {
return 1
}
}
)
// 17. Run these steps, but abort when the ongoing fetch is terminated:
// 1. Set responses body to a new body whose stream is stream.
response.body = { stream }
// 2. If response is not a network error and requests cache mode is
// not "no-store", then update response in httpCache for request.
// TODO
// 3. If includeCredentials is true and the user agent is not configured
// to block cookies for request (see section 7 of [COOKIES]), then run the
// "set-cookie-string" parsing algorithm (see section 5.2 of [COOKIES]) on
// the value of each header whose name is a byte-case-insensitive match for
// `Set-Cookie` in responses header list, if any, and requests current URL.
// TODO
// 18. If aborted, then:
// TODO
// 19. Run these steps in parallel:
// 1. Run these steps, but abort when fetchParams is canceled:
fetchParams.controller.on('terminated', onAborted)
fetchParams.controller.resume = async () => {
// 1. While true
while (true) {
// 1-3. See onData...
// 4. Set bytes to the result of handling content codings given
// codings and bytes.
let bytes
let isFailure
try {
const { done, value } = await fetchParams.controller.next()
if (isAborted(fetchParams)) {
break
}
bytes = done ? undefined : value
} catch (err) {
if (fetchParams.controller.ended && !timingInfo.encodedBodySize) {
// zlib doesn't like empty streams.
bytes = undefined
} else {
bytes = err
// err may be propagated from the result of calling readablestream.cancel,
// which might not be an error. https://github.com/nodejs/undici/issues/2009
isFailure = true
}
}
if (bytes === undefined) {
// 2. Otherwise, if the bytes transmission for responses message
// body is done normally and stream is readable, then close
// stream, finalize response for fetchParams and response, and
// abort these in-parallel steps.
readableStreamClose(fetchParams.controller.controller)
finalizeResponse(fetchParams, response)
return
}
// 5. Increase timingInfos decoded body size by bytess length.
timingInfo.decodedBodySize += bytes?.byteLength ?? 0
// 6. If bytes is failure, then terminate fetchParamss controller.
if (isFailure) {
fetchParams.controller.terminate(bytes)
return
}
// 7. Enqueue a Uint8Array wrapping an ArrayBuffer containing bytes
// into stream.
fetchParams.controller.controller.enqueue(new Uint8Array(bytes))
// 8. If stream is errored, then terminate the ongoing fetch.
if (isErrored(stream)) {
fetchParams.controller.terminate()
return
}
// 9. If stream doesnt need more data ask the user agent to suspend
// the ongoing fetch.
if (!fetchParams.controller.controller.desiredSize) {
return
}
}
}
// 2. If aborted, then:
function onAborted (reason) {
// 2. If fetchParams is aborted, then:
if (isAborted(fetchParams)) {
// 1. Set responses aborted flag.
response.aborted = true
// 2. If stream is readable, then error stream with the result of
// deserialize a serialized abort reason given fetchParamss
// controllers serialized abort reason and an
// implementation-defined realm.
if (isReadable(stream)) {
fetchParams.controller.controller.error(
fetchParams.controller.serializedAbortReason
)
}
} else {
// 3. Otherwise, if stream is readable, error stream with a TypeError.
if (isReadable(stream)) {
fetchParams.controller.controller.error(new TypeError('terminated', {
cause: isErrorLike(reason) ? reason : undefined
}))
}
}
// 4. If connection uses HTTP/2, then transmit an RST_STREAM frame.
// 5. Otherwise, the user agent should close connection unless it would be bad for performance to do so.
fetchParams.controller.connection.destroy()
}
// 20. Return response.
return response
async function dispatch ({ body }) {
const url = requestCurrentURL(request)
/** @type {import('../..').Agent} */
const agent = fetchParams.controller.dispatcher
return new Promise((resolve, reject) => agent.dispatch(
{
path: url.pathname + url.search,
origin: url.origin,
method: request.method,
body: fetchParams.controller.dispatcher.isMockActive ? request.body && (request.body.source || request.body.stream) : body,
headers: request.headersList.entries,
maxRedirections: 0,
upgrade: request.mode === 'websocket' ? 'websocket' : undefined
},
{
body: null,
abort: null,
onConnect (abort) {
// TODO (fix): Do we need connection here?
const { connection } = fetchParams.controller
if (connection.destroyed) {
abort(new DOMException('The operation was aborted.', 'AbortError'))
} else {
fetchParams.controller.on('terminated', abort)
this.abort = connection.abort = abort
}
},
onHeaders (status, headersList, resume, statusText) {
if (status < 200) {
return
}
let codings = []
let location = ''
const headers = new Headers()
// For H2, the headers are a plain JS object
// We distinguish between them and iterate accordingly
if (Array.isArray(headersList)) {
for (let n = 0; n < headersList.length; n += 2) {
const key = headersList[n + 0].toString('latin1')
const val = headersList[n + 1].toString('latin1')
if (key.toLowerCase() === 'content-encoding') {
// https://www.rfc-editor.org/rfc/rfc7231#section-3.1.2.1
// "All content-coding values are case-insensitive..."
codings = val.toLowerCase().split(',').map((x) => x.trim())
} else if (key.toLowerCase() === 'location') {
location = val
}
headers[kHeadersList].append(key, val)
}
} else {
const keys = Object.keys(headersList)
for (const key of keys) {
const val = headersList[key]
if (key.toLowerCase() === 'content-encoding') {
// https://www.rfc-editor.org/rfc/rfc7231#section-3.1.2.1
// "All content-coding values are case-insensitive..."
codings = val.toLowerCase().split(',').map((x) => x.trim()).reverse()
} else if (key.toLowerCase() === 'location') {
location = val
}
headers[kHeadersList].append(key, val)
}
}
this.body = new Readable({ read: resume })
const decoders = []
const willFollow = request.redirect === 'follow' &&
location &&
redirectStatusSet.has(status)
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding
if (request.method !== 'HEAD' && request.method !== 'CONNECT' && !nullBodyStatus.includes(status) && !willFollow) {
for (const coding of codings) {
// https://www.rfc-editor.org/rfc/rfc9112.html#section-7.2
if (coding === 'x-gzip' || coding === 'gzip') {
decoders.push(zlib.createGunzip({
// Be less strict when decoding compressed responses, since sometimes
// servers send slightly invalid responses that are still accepted
// by common browsers.
// Always using Z_SYNC_FLUSH is what cURL does.
flush: zlib.constants.Z_SYNC_FLUSH,
finishFlush: zlib.constants.Z_SYNC_FLUSH
}))
} else if (coding === 'deflate') {
decoders.push(zlib.createInflate())
} else if (coding === 'br') {
decoders.push(zlib.createBrotliDecompress())
} else {
decoders.length = 0
break
}
}
}
resolve({
status,
statusText,
headersList: headers[kHeadersList],
body: decoders.length
? pipeline(this.body, ...decoders, () => { })
: this.body.on('error', () => {})
})
return true
},
onData (chunk) {
if (fetchParams.controller.dump) {
return
}
// 1. If one or more bytes have been transmitted from responses
// message body, then:
// 1. Let bytes be the transmitted bytes.
const bytes = chunk
// 2. Let codings be the result of extracting header list values
// given `Content-Encoding` and responses header list.
// See pullAlgorithm.
// 3. Increase timingInfos encoded body size by bytess length.
timingInfo.encodedBodySize += bytes.byteLength
// 4. See pullAlgorithm...
return this.body.push(bytes)
},
onComplete () {
if (this.abort) {
fetchParams.controller.off('terminated', this.abort)
}
fetchParams.controller.ended = true
this.body.push(null)
},
onError (error) {
if (this.abort) {
fetchParams.controller.off('terminated', this.abort)
}
this.body?.destroy(error)
fetchParams.controller.terminate(error)
reject(error)
},
onUpgrade (status, headersList, socket) {
if (status !== 101) {
return
}
const headers = new Headers()
for (let n = 0; n < headersList.length; n += 2) {
const key = headersList[n + 0].toString('latin1')
const val = headersList[n + 1].toString('latin1')
headers[kHeadersList].append(key, val)
}
resolve({
status,
statusText: STATUS_CODES[status],
headersList: headers[kHeadersList],
socket
})
return true
}
}
))
}
}
module.exports = {
fetch,
Fetch,
fetching,
finalizeAndReportTiming
}