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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef mozilla_dom_XMLHttpRequestMainThread_h
#define mozilla_dom_XMLHttpRequestMainThread_h
#include <bitset>
#include "nsISupportsUtils.h"
#include "nsIURI.h"
#include "mozilla/dom/Document.h"
#include "nsIStreamListener.h"
#include "nsIChannelEventSink.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIDOMEventListener.h"
#include "nsIInterfaceRequestor.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsIProgressEventSink.h"
#include "nsJSUtils.h"
#include "nsTArray.h"
#include "nsITimer.h"
#include "nsIPrincipal.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsISizeOfEventTarget.h"
#include "nsIInputStream.h"
#include "nsIContentSecurityPolicy.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/NotNull.h"
#include "mozilla/dom/MutableBlobStorage.h"
#include "mozilla/dom/BodyExtractor.h"
#include "mozilla/dom/ClientInfo.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/MimeType.h"
#include "mozilla/dom/PerformanceStorage.h"
#include "mozilla/dom/ServiceWorkerDescriptor.h"
#include "mozilla/dom/URLSearchParams.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/XMLHttpRequest.h"
#include "mozilla/dom/XMLHttpRequestBinding.h"
#include "mozilla/dom/XMLHttpRequestEventTarget.h"
#include "mozilla/dom/XMLHttpRequestString.h"
#include "mozilla/Encoding.h"
#include "nsBaseChannel.h"
#ifdef Status
/* Xlib headers insist on this for some reason... Nuke it because
it'll override our member name */
typedef Status __StatusTmp;
# undef Status
typedef __StatusTmp Status;
class nsIHttpChannel;
class nsIJARChannel;
class nsILoadGroup;
namespace mozilla {
class ProfileChunkedBuffer;
namespace dom {
class DOMString;
class XMLHttpRequestUpload;
class SerializedStackHolder;
struct OriginAttributesDictionary;
// A helper for building up an ArrayBuffer object's data
// before creating the ArrayBuffer itself. Will do doubling
// based reallocation, up to an optional maximum growth given.
// When all the data has been appended, call GetArrayBuffer,
// passing in the JSContext* for which the ArrayBuffer object
// is to be created. This also implicitly resets the builder.
class ArrayBufferBuilder {
// Will truncate if aNewCap is < Length().
bool SetCapacity(uint32_t aNewCap);
// Append aDataLen bytes from data to the current buffer. If we
// need to grow the buffer, grow by doubling the size up to a
// maximum of aMaxGrowth (if given). If aDataLen is greater than
// what the new capacity would end up as, then grow by aDataLen.
// The data parameter must not overlap with anything beyond the
// builder's current valid contents [0..length)
bool Append(const uint8_t* aNewData, uint32_t aDataLen,
uint32_t aMaxGrowth = 0);
uint32_t Length();
uint32_t Capacity();
JSObject* TakeArrayBuffer(JSContext* aCx);
// Memory mapping to starting position of file(aFile) in the zip
// package(aJarFile).
// The file in the zip package has to be uncompressed and the starting
// position of the file must be aligned according to array buffer settings
// in JS engine.
nsresult MapToFileInPackage(const nsCString& aFile, nsIFile* aJarFile);
ArrayBufferBuilder(const ArrayBufferBuilder&) = delete;
ArrayBufferBuilder& operator=(const ArrayBufferBuilder&) = delete;
ArrayBufferBuilder& operator=(const ArrayBufferBuilder&&) = delete;
bool SetCapacityInternal(uint32_t aNewCap, const MutexAutoLock& aProofOfLock)
static bool AreOverlappingRegions(const uint8_t* aStart1, uint32_t aLength1,
const uint8_t* aStart2, uint32_t aLength2);
Mutex mMutex;
// All of these are protected by mMutex.
uint8_t* mDataPtr MOZ_GUARDED_BY(mMutex);
uint32_t mCapacity MOZ_GUARDED_BY(mMutex);
uint32_t mLength MOZ_GUARDED_BY(mMutex);
void* mMapPtr MOZ_GUARDED_BY(mMutex);
// This is used in assertions only.
bool mNeutered;
class nsXMLHttpRequestXPCOMifier;
class RequestHeaders {
struct RequestHeader {
nsCString mName;
nsCString mValue;
nsTArray<RequestHeader> mHeaders;
RequestHeader* Find(const nsACString& aName);
class CharsetIterator {
bool mValid;
int32_t mCurPos, mCurLen, mCutoff;
nsACString& mSource;
explicit CharsetIterator(nsACString& aSource);
bool Equals(const nsACString& aOther,
const nsCStringComparator& aCmp) const;
void Replace(const nsACString& aReplacement);
bool Next();
bool IsEmpty() const;
bool Has(const char* aName);
bool Has(const nsACString& aName);
void Get(const char* aName, nsACString& aValue);
void Get(const nsACString& aName, nsACString& aValue);
void Set(const char* aName, const nsACString& aValue);
void Set(const nsACString& aName, const nsACString& aValue);
void MergeOrSet(const char* aName, const nsACString& aValue);
void MergeOrSet(const nsACString& aName, const nsACString& aValue);
void Clear();
void ApplyToChannel(nsIHttpChannel* aChannel, bool aStripRequestBodyHeader,
bool aStripAuth) const;
void GetCORSUnsafeHeaders(nsTArray<nsCString>& aArray) const;
class nsXHRParseEndListener;
class XMLHttpRequestDoneNotifier;
// Make sure that any non-DOM interfaces added here are also added to
// nsXMLHttpRequestXPCOMifier.
class XMLHttpRequestMainThread final : public XMLHttpRequest,
public nsIStreamListener,
public nsIChannelEventSink,
public nsIProgressEventSink,
public nsIInterfaceRequestor,
public nsITimerCallback,
public nsISizeOfEventTarget,
public nsINamed,
public MutableBlobStorageCallback {
friend class nsXHRParseEndListener;
friend class nsXMLHttpRequestXPCOMifier;
friend class XMLHttpRequestDoneNotifier;
// Make sure that any additions done to ErrorType enum are also mirrored in
// XHR_ERROR_TYPE enum of TelemetrySend.sys.mjs.
enum class ErrorType : uint16_t {
explicit XMLHttpRequestMainThread(nsIGlobalObject* aGlobalObject);
void Construct(nsIPrincipal* aPrincipal,
nsICookieJarSettings* aCookieJarSettings, bool aForWorker,
nsIURI* aBaseURI = nullptr, nsILoadGroup* aLoadGroup = nullptr,
PerformanceStorage* aPerformanceStorage = nullptr,
nsICSPEventListener* aCSPEventListener = nullptr);
void InitParameters(bool aAnon, bool aSystem);
void SetParameters(bool aAnon, bool aSystem) {
mIsAnon = aAnon || aSystem;
mIsSystem = aSystem;
void SetClientInfoAndController(
const ClientInfo& aClientInfo,
const Maybe<ServiceWorkerDescriptor>& aController);
// nsIStreamListener
// nsIRequestObserver
// nsIChannelEventSink
// nsIProgressEventSink
// nsIInterfaceRequestor
// nsITimerCallback
// nsINamed
// nsISizeOfEventTarget
virtual size_t SizeOfEventTargetIncludingThis(
MallocSizeOf aMallocSizeOf) const override;
// states
virtual uint16_t ReadyState() const override;
// request
nsresult CreateChannel();
nsresult InitiateFetch(already_AddRefed<nsIInputStream> aUploadStream,
int64_t aUploadLength, nsACString& aUploadContentType);
virtual void Open(const nsACString& aMethod, const nsAString& aUrl,
ErrorResult& aRv) override;
virtual void Open(const nsACString& aMethod, const nsAString& aUrl,
bool aAsync, const nsAString& aUsername,
const nsAString& aPassword, ErrorResult& aRv) override;
void Open(const nsACString& aMethod, const nsACString& aUrl, bool aAsync,
const nsAString& aUsername, const nsAString& aPassword,
ErrorResult& aRv);
virtual void SetRequestHeader(const nsACString& aName,
const nsACString& aValue,
ErrorResult& aRv) override;
virtual uint32_t Timeout() const override { return mTimeoutMilliseconds; }
virtual void SetTimeout(uint32_t aTimeout, ErrorResult& aRv) override;
virtual bool WithCredentials() const override;
virtual void SetWithCredentials(bool aWithCredentials,
ErrorResult& aRv) override;
virtual XMLHttpRequestUpload* GetUpload(ErrorResult& aRv) override;
virtual ~XMLHttpRequestMainThread();
nsresult MaybeSilentSendFailure(nsresult aRv);
void SendInternal(const BodyExtractorBase* aBody,
bool aBodyIsDocumentOrString, ErrorResult& aRv);
bool IsCrossSiteCORSRequest() const;
bool IsDeniedCrossSiteCORSRequest();
void ResumeTimeout();
void MaybeLowerChannelPriority();
bool CanSend(ErrorResult& aRv);
virtual void Send(
const Nullable<
ErrorResult& aRv) override;
virtual void SendInputStream(nsIInputStream* aInputStream,
ErrorResult& aRv) override {
if (!CanSend(aRv)) {
BodyExtractor<nsIInputStream> body(aInputStream);
SendInternal(&body, false, aRv);
void RequestErrorSteps(const ProgressEventType aEventType,
const nsresult aOptionalException, ErrorResult& aRv);
void Abort() {
IgnoredErrorResult rv;
MOZ_ASSERT(!rv.Failed() || rv.ErrorCodeIs(NS_ERROR_DOM_ABORT_ERR));
virtual void Abort(ErrorResult& aRv) override;
// response
virtual void GetResponseURL(nsAString& aUrl) override;
virtual uint32_t GetStatus(ErrorResult& aRv) override;
virtual void GetStatusText(nsACString& aStatusText,
ErrorResult& aRv) override;
virtual void GetResponseHeader(const nsACString& aHeader, nsACString& aResult,
ErrorResult& aRv) override;
void GetResponseHeader(const nsAString& aHeader, nsAString& aResult,
ErrorResult& aRv) {
nsAutoCString result;
GetResponseHeader(NS_ConvertUTF16toUTF8(aHeader), result, aRv);
if (result.IsVoid()) {
} else {
// The result value should be inflated:
CopyASCIItoUTF16(result, aResult);
virtual void GetAllResponseHeaders(nsACString& aResponseHeaders,
ErrorResult& aRv) override;
bool IsSafeHeader(const nsACString& aHeaderName,
NotNull<nsIHttpChannel*> aHttpChannel) const;
virtual void OverrideMimeType(const nsAString& aMimeType,
ErrorResult& aRv) override;
virtual XMLHttpRequestResponseType ResponseType() const override {
return XMLHttpRequestResponseType(mResponseType);
virtual void SetResponseType(XMLHttpRequestResponseType aType,
ErrorResult& aRv) override;
void SetResponseTypeRaw(XMLHttpRequestResponseType aType) {
mResponseType = aType;
virtual void GetResponse(JSContext* aCx,
JS::MutableHandle<JS::Value> aResponse,
ErrorResult& aRv) override;
virtual void GetResponseText(DOMString& aResponseText,
ErrorResult& aRv) override;
// GetResponse* for workers:
already_AddRefed<BlobImpl> GetResponseBlobImpl();
already_AddRefed<ArrayBufferBuilder> GetResponseArrayBufferBuilder();
nsresult GetResponseTextForJSON(nsAString& aString);
void GetResponseText(XMLHttpRequestStringSnapshot& aSnapshot,
ErrorResult& aRv);
virtual Document* GetResponseXML(ErrorResult& aRv) override;
virtual bool MozBackgroundRequest() const override;
void SetMozBackgroundRequestExternal(bool aMozBackgroundRequest,
ErrorResult& aRv);
virtual void SetMozBackgroundRequest(bool aMozBackgroundRequest,
ErrorResult& aRv) override;
void SetOriginStack(UniquePtr<SerializedStackHolder> aOriginStack);
void SetSource(UniquePtr<ProfileChunkedBuffer> aSource);
nsresult ErrorDetail() const { return mErrorLoadDetail; }
virtual uint16_t ErrorCode() const override {
return static_cast<uint16_t>(mErrorLoad);
virtual bool MozAnon() const override;
virtual bool MozSystem() const override;
virtual nsIChannel* GetChannel() const override { return mChannel; }
// We need a GetInterface callable from JS for chrome JS
virtual void GetInterface(JSContext* aCx, JS::Handle<JS::Value> aIID,
JS::MutableHandle<JS::Value> aRetval,
ErrorResult& aRv) override;
// This fires a trusted readystatechange event, which is not cancelable and
// doesn't bubble.
nsresult FireReadystatechangeEvent();
void DispatchProgressEvent(DOMEventTargetHelper* aTarget,
const ProgressEventType& aType, int64_t aLoaded,
int64_t aTotal);
XMLHttpRequestMainThread, XMLHttpRequest)
virtual bool IsCertainlyAliveForCC() const override;
bool AllowUploadProgress();
virtual void DisconnectFromOwner() override;
static void SetDontWarnAboutSyncXHR(bool aVal) {
sDontWarnAboutSyncXHR = aVal;
static bool DontWarnAboutSyncXHR() { return sDontWarnAboutSyncXHR; }
virtual void SetOriginAttributes(
const mozilla::dom::OriginAttributesDictionary& aAttrs) override;
void BlobStoreCompleted(MutableBlobStorage* aBlobStorage, BlobImpl* aBlobImpl,
nsresult aResult) override;
void LocalFileToBlobCompleted(BlobImpl* aBlobImpl);
#ifdef DEBUG
// For logging when there's trouble
RefPtr<ThreadSafeWorkerRef> mTSWorkerRef = nullptr;
nsresult DetectCharset();
nsresult AppendToResponseText(Span<const uint8_t> aBuffer,
bool aLast = false);
static nsresult StreamReaderFunc(nsIInputStream* in, void* closure,
const char* fromRawSegment,
uint32_t toOffset, uint32_t count,
uint32_t* writeCount);
nsresult CreateResponseParsedJSON(JSContext* aCx);
// Change the state of the object with this. The broadcast argument
// determines if the onreadystatechange listener should be called.
nsresult ChangeState(uint16_t aState, bool aBroadcast = true);
already_AddRefed<nsILoadGroup> GetLoadGroup() const;
// Finds a preload for this XHR. If it is found it's removed from the preload
// table of the document and marked as used. The called doesn't need to do
// any more comparative checks.
already_AddRefed<PreloaderBase> FindPreload();
// If no or unknown mime type is set on the channel this method ensures it's
// set to "text/xml".
void EnsureChannelContentType();
// Gets the value of the final content-type header from the channel.
bool GetContentType(nsACString& aValue) const;
already_AddRefed<nsIHttpChannel> GetCurrentHttpChannel();
already_AddRefed<nsIJARChannel> GetCurrentJARChannel();
void TruncateResponseText();
bool IsSystemXHR() const;
bool InUploadPhase() const;
void OnBodyParseEnd();
void ChangeStateToDone(bool aWasSync);
void ChangeStateToDoneInternal();
void StartProgressEventTimer();
void StopProgressEventTimer();
void MaybeCreateBlobStorage();
nsresult OnRedirectVerifyCallback(nsresult result, bool stripAuth = false);
nsIEventTarget* GetTimerEventTarget();
nsresult DispatchToMainThread(already_AddRefed<nsIRunnable> aRunnable);
void DispatchOrStoreEvent(DOMEventTargetHelper* aTarget, Event* aEvent);
already_AddRefed<nsXMLHttpRequestXPCOMifier> EnsureXPCOMifier();
void SuspendEventDispatching();
void ResumeEventDispatching();
void AbortInternal(ErrorResult& aRv);
Maybe<nsBaseChannel::ContentRange> GetRequestedContentRange() const;
void GetContentRangeHeader(nsACString&) const;
struct PendingEvent {
RefPtr<DOMEventTargetHelper> mTarget;
RefPtr<Event> mEvent;
nsTArray<PendingEvent> mPendingEvents;
nsCOMPtr<nsISupports> mContext;
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCOMPtr<nsIChannel> mChannel;
nsCString mRequestMethod;
nsCOMPtr<nsIURI> mRequestURL;
RefPtr<Document> mResponseXML;
nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;
nsCOMPtr<nsICookieJarSettings> mCookieJarSettings;
RefPtr<PerformanceStorage> mPerformanceStorage;
nsCOMPtr<nsICSPEventListener> mCSPEventListener;
// used to implement getAllResponseHeaders()
class nsHeaderVisitor : public nsIHttpHeaderVisitor {
struct HeaderEntry final {
nsCString mName;
nsCString mValue;
HeaderEntry(const nsACString& aName, const nsACString& aValue)
: mName(aName), mValue(aValue) {}
bool operator==(const HeaderEntry& aOther) const {
return mName == aOther.mName;
bool operator<(const HeaderEntry& aOther) const {
uint32_t selfLen = mName.Length();
uint32_t otherLen = aOther.mName.Length();
uint32_t min = XPCOM_MIN(selfLen, otherLen);
for (uint32_t i = 0; i < min; ++i) {
unsigned char self = mName[i];
unsigned char other = aOther.mName[i];
MOZ_ASSERT(!(self >= 'A' && self <= 'Z'));
MOZ_ASSERT(!(other >= 'A' && other <= 'Z'));
if (self == other) {
if (self >= 'a' && self <= 'z') {
self -= 0x20;
if (other >= 'a' && other <= 'z') {
other -= 0x20;
return self < other;
return selfLen < otherLen;
nsHeaderVisitor(const XMLHttpRequestMainThread& aXMLHttpRequest,
NotNull<nsIHttpChannel*> aHttpChannel);
const nsACString& Headers() {
for (uint32_t i = 0; i < mHeaderList.Length(); i++) {
HeaderEntry& header = mHeaderList.ElementAt(i);
mHeaders.AppendLiteral(": ");
return mHeaders;
virtual ~nsHeaderVisitor();
nsTArray<HeaderEntry> mHeaderList;
nsCString mHeaders;
const XMLHttpRequestMainThread& mXHR;
NotNull<nsCOMPtr<nsIHttpChannel>> mHttpChannel;
// The bytes of our response body. Only used for DEFAULT, ARRAYBUFFER and
// BLOB responseTypes
nsCString mResponseBody;
// The text version of our response body. This is incrementally decoded into
// as we receive network data. However for the DEFAULT responseType we
// lazily decode into this from mResponseBody only when .responseText is
// accessed.
// Only used for DEFAULT and TEXT responseTypes.
XMLHttpRequestString mResponseText;
// For DEFAULT responseType we use this to keep track of how far we've
// lazily decoded from mResponseBody to mResponseText
uint32_t mResponseBodyDecodedPos;
// Decoder used for decoding into mResponseText
// Only used for DEFAULT, TEXT and JSON responseTypes.
// In cases where we've only received half a surrogate, the decoder itself
// carries the state to remember this. Next time we receive more data we
// simply feed the new data into the decoder which will handle the second
// part of the surrogate.
mozilla::UniquePtr<mozilla::Decoder> mDecoder;
void MatchCharsetAndDecoderToResponseDocument();
XMLHttpRequestResponseType mResponseType;
RefPtr<BlobImpl> mResponseBlobImpl;
// This is the cached blob-response, created only at the first GetResponse()
// call.
RefPtr<Blob> mResponseBlob;
// We stream data to mBlobStorage when response type is "blob".
RefPtr<MutableBlobStorage> mBlobStorage;
nsString mOverrideMimeType;
* The notification callbacks the channel had when Send() was
* called. We want to forward things here as needed.
nsCOMPtr<nsIInterfaceRequestor> mNotificationCallbacks;
* Sink interfaces that we implement that mNotificationCallbacks may
* want to also be notified for. These are inited lazily if we're
* asked for the relevant interface.
nsCOMPtr<nsIChannelEventSink> mChannelEventSink;
nsCOMPtr<nsIProgressEventSink> mProgressEventSink;
nsCOMPtr<nsIURI> mBaseURI;
nsCOMPtr<nsILoadGroup> mLoadGroup;
Maybe<ClientInfo> mClientInfo;
Maybe<ServiceWorkerDescriptor> mController;
uint16_t mState;
// If true, this object is used by the worker's XMLHttpRequest.
bool mForWorker;
bool mFlagSynchronous;
bool mFlagAborted;
bool mFlagParseBody;
bool mFlagSyncLooping;
bool mFlagBackgroundRequest;
bool mFlagHadUploadListenersOnSend;
bool mFlagACwithCredentials;
bool mFlagTimedOut;
bool mFlagDeleted;
// The XHR2 spec's send() flag. Set when the XHR begins uploading, until it
// finishes downloading (or an error/abort has occurred during either phase).
// Used to guard against the user trying to alter headers/etc when it's too
// late, and ensure the XHR only handles one in-flight request at once.
bool mFlagSend;
RefPtr<XMLHttpRequestUpload> mUpload;
int64_t mUploadTransferred;
int64_t mUploadTotal;
bool mUploadComplete;
bool mProgressSinceLastProgressEvent;
// Timeout support
PRTime mRequestSentTime;
uint32_t mTimeoutMilliseconds;
nsCOMPtr<nsITimer> mTimeoutTimer;
void StartTimeoutTimer();
void HandleTimeoutCallback();
void CancelTimeoutTimer();
nsCOMPtr<nsIRunnable> mResumeTimeoutRunnable;
nsCOMPtr<nsITimer> mSyncTimeoutTimer;
enum SyncTimeoutType { eErrorOrExpired, eTimerStarted, eNoTimerNeeded };
SyncTimeoutType MaybeStartSyncTimeoutTimer();
void HandleSyncTimeoutTimer();
void CancelSyncTimeoutTimer();
ErrorType mErrorLoad;
nsresult mErrorLoadDetail;
bool mErrorParsingXML;
bool mWaitingForOnStopRequest;
bool mProgressTimerIsActive;
bool mIsHtml;
bool mWarnAboutSyncHtml;
int64_t mLoadTotal; // -1 if not known.
// Number of HTTP message body bytes received so far. This quantity is
// in the same units as Content-Length and mLoadTotal, and hence counts
// compressed bytes when the channel has gzip Content-Encoding. If the
// channel does not have Content-Encoding, this will be the same as
// mDataReceived except between the OnProgress that changes mLoadTransferred
// and the corresponding OnDataAvailable (which changes mDataReceived).
// Ordering of OnProgress and OnDataAvailable is undefined.
int64_t mLoadTransferred;
nsCOMPtr<nsITimer> mProgressNotifier;
void HandleProgressTimerCallback();
bool mIsSystem;
bool mIsAnon;
* Close the XMLHttpRequest's channels.
void CloseRequest(nsresult detail);
void TerminateOngoingFetch(nsresult detail);
* Close the XMLHttpRequest's channels and dispatch appropriate progress
* events.
* @param aType The progress event type.
void CloseRequestWithError(const ErrorProgressEventType& aType);
nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
nsCOMPtr<nsIChannel> mNewRedirectChannel;
JS::Heap<JS::Value> mResultJSON;
RefPtr<ArrayBufferBuilder> mArrayBufferBuilder;
JS::Heap<JSObject*> mResultArrayBuffer;
bool mIsMappedArrayBuffer;
void ResetResponse();
bool ShouldBlockAuthPrompt();
RequestHeaders mAuthorRequestHeaders;
// Helper object to manage our XPCOM scriptability bits
nsXMLHttpRequestXPCOMifier* mXPCOMifier;
// When this is set to true, the event dispatching is suspended. This is
// useful to change the correct state when XHR is working sync.
bool mEventDispatchingSuspended;
// True iff mDecoder has processed the end of the stream.
// Used in lazy decoding to distinguish between having
// processed all the bytes but not the EOF and having
// processed all the bytes and the EOF.
bool mEofDecoded;
// This flag will be set in `Send()` when we successfully reuse a "fetch"
// preload to satisfy this XHR.
bool mFromPreload = false;
// Our parse-end listener, if we are parsing.
RefPtr<nsXHRParseEndListener> mParseEndListener;
XMLHttpRequestDoneNotifier* mDelayedDoneNotifier;
void DisconnectDoneNotifier();
// Any stack information for the point the XHR was opened. This is deleted
// after the XHR is opened, to avoid retaining references to the worker.
UniquePtr<SerializedStackHolder> mOriginStack;
static bool sDontWarnAboutSyncXHR;
class MOZ_STACK_CLASS AutoDontWarnAboutSyncXHR {
: mOldVal(XMLHttpRequestMainThread::DontWarnAboutSyncXHR()) {
~AutoDontWarnAboutSyncXHR() {
bool mOldVal;
// A shim class designed to expose the non-DOM interfaces of
// XMLHttpRequest via XPCOM stuff.
class nsXMLHttpRequestXPCOMifier final : public nsIStreamListener,
public nsIChannelEventSink,
public nsIAsyncVerifyRedirectCallback,
public nsIProgressEventSink,
public nsIInterfaceRequestor,
public nsITimerCallback,
public nsINamed {
explicit nsXMLHttpRequestXPCOMifier(XMLHttpRequestMainThread* aXHR)
: mXHR(aXHR) {}
~nsXMLHttpRequestXPCOMifier() {
if (mXHR) {
mXHR->mXPCOMifier = nullptr;
RefPtr<XMLHttpRequestMainThread> mXHR;
class XMLHttpRequestDoneNotifier : public Runnable {
explicit XMLHttpRequestDoneNotifier(XMLHttpRequestMainThread* aXHR)
: Runnable("XMLHttpRequestDoneNotifier"), mXHR(aXHR) {}
NS_IMETHOD Run() override {
if (mXHR) {
RefPtr<XMLHttpRequestMainThread> xhr = mXHR;
// ChangeStateToDoneInternal ends up calling Disconnect();
return NS_OK;
void Disconnect() { mXHR = nullptr; }
RefPtr<XMLHttpRequestMainThread> mXHR;
class nsXHRParseEndListener : public nsIDOMEventListener {
NS_IMETHOD HandleEvent(Event* event) override {
if (mXHR) {
mXHR = nullptr;
return NS_OK;
explicit nsXHRParseEndListener(XMLHttpRequestMainThread* aXHR) : mXHR(aXHR) {}
void SetIsStale() { mXHR = nullptr; }
virtual ~nsXHRParseEndListener() = default;
XMLHttpRequestMainThread* mXHR;
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_XMLHttpRequestMainThread_h