// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "net/quic/quic_http_stream.h" #include #include "base/auto_reset.h" #include "base/callback_helpers.h" #include "base/metrics/histogram_macros.h" #include "base/strings/string_split.h" #include "base/threading/thread_task_runner_handle.h" #include "net/base/load_flags.h" #include "net/base/net_errors.h" #include "net/http/http_response_headers.h" #include "net/http/http_util.h" #include "net/log/net_log.h" #include "net/log/net_log_event_type.h" #include "net/log/net_log_source.h" #include "net/quic/quic_http_utils.h" #include "net/spdy/spdy_http_utils.h" #include "net/ssl/ssl_info.h" #include "net/third_party/quic/core/http/quic_client_promised_info.h" #include "net/third_party/quic/core/http/spdy_utils.h" #include "net/third_party/quic/core/quic_stream_sequencer.h" #include "net/third_party/quic/core/quic_utils.h" #include "net/third_party/quic/platform/api/quic_string_piece.h" #include "net/third_party/spdy/core/spdy_frame_builder.h" #include "net/third_party/spdy/core/spdy_framer.h" namespace net { namespace { std::unique_ptr NetLogQuicPushStreamCallback( quic::QuicStreamId stream_id, const GURL* url, NetLogCaptureMode capture_mode) { std::unique_ptr dict(new base::DictionaryValue()); dict->SetInteger("stream_id", stream_id); dict->SetString("url", url->spec()); return std::move(dict); } } // namespace QuicHttpStream::QuicHttpStream( std::unique_ptr session) : MultiplexedHttpStream(std::move(session)), next_state_(STATE_NONE), stream_(nullptr), request_info_(nullptr), can_send_early_(false), request_body_stream_(nullptr), priority_(MINIMUM_PRIORITY), response_info_(nullptr), has_response_status_(false), response_status_(ERR_UNEXPECTED), response_headers_received_(false), trailing_headers_received_(false), headers_bytes_received_(0), headers_bytes_sent_(0), closed_stream_received_bytes_(0), closed_stream_sent_bytes_(0), closed_is_first_stream_(false), user_buffer_len_(0), session_error_(ERR_UNEXPECTED), found_promise_(false), in_loop_(false), weak_factory_(this) {} QuicHttpStream::~QuicHttpStream() { CHECK(!in_loop_); Close(false); } HttpResponseInfo::ConnectionInfo QuicHttpStream::ConnectionInfoFromQuicVersion( quic::QuicTransportVersion quic_version) { switch (quic_version) { case quic::QUIC_VERSION_UNSUPPORTED: return HttpResponseInfo::CONNECTION_INFO_QUIC_UNKNOWN_VERSION; case quic::QUIC_VERSION_35: return HttpResponseInfo::CONNECTION_INFO_QUIC_35; case quic::QUIC_VERSION_39: return HttpResponseInfo::CONNECTION_INFO_QUIC_39; case quic::QUIC_VERSION_43: return HttpResponseInfo::CONNECTION_INFO_QUIC_43; case quic::QUIC_VERSION_44: return HttpResponseInfo::CONNECTION_INFO_QUIC_44; case quic::QUIC_VERSION_99: return HttpResponseInfo::CONNECTION_INFO_QUIC_99; } NOTREACHED(); return HttpResponseInfo::CONNECTION_INFO_QUIC_UNKNOWN_VERSION; } int QuicHttpStream::InitializeStream(const HttpRequestInfo* request_info, bool can_send_early, RequestPriority priority, const NetLogWithSource& stream_net_log, CompletionOnceCallback callback) { CHECK(callback_.is_null()); DCHECK(!stream_); DCHECK(request_info->traffic_annotation.is_valid()); // HttpNetworkTransaction will retry any request that fails with // ERR_QUIC_HANDSHAKE_FAILED. It will retry any request with // ERR_CONNECTION_CLOSED so long as the connection has been used for other // streams first and headers have not yet been received. if (!quic_session()->IsConnected()) return GetResponseStatus(); stream_net_log.AddEvent( NetLogEventType::HTTP_STREAM_REQUEST_BOUND_TO_QUIC_SESSION, quic_session()->net_log().source().ToEventParametersCallback()); stream_net_log.AddEvent( NetLogEventType::QUIC_CONNECTION_MIGRATION_MODE, NetLog::IntCallback( "connection_migration_mode", static_cast(quic_session()->connection_migration_mode()))); stream_net_log_ = stream_net_log; request_info_ = request_info; can_send_early_ = can_send_early; request_time_ = base::Time::Now(); priority_ = priority; SaveSSLInfo(); std::string url(request_info->url.spec()); quic::QuicClientPromisedInfo* promised = quic_session()->GetPushPromiseIndex()->GetPromised(url); if (promised) { found_promise_ = true; stream_net_log_.AddEvent( NetLogEventType::QUIC_HTTP_STREAM_PUSH_PROMISE_RENDEZVOUS, base::Bind(&NetLogQuicPushStreamCallback, promised->id(), &request_info_->url)); quic_session()->net_log().AddEvent( NetLogEventType::QUIC_HTTP_STREAM_PUSH_PROMISE_RENDEZVOUS, base::Bind(&NetLogQuicPushStreamCallback, promised->id(), &request_info_->url)); return OK; } next_state_ = STATE_REQUEST_STREAM; int rv = DoLoop(OK); if (rv == ERR_IO_PENDING) callback_ = std::move(callback); return MapStreamError(rv); } int QuicHttpStream::DoHandlePromise() { next_state_ = STATE_HANDLE_PROMISE_COMPLETE; return quic_session()->RendezvousWithPromised( request_headers_, base::Bind(&QuicHttpStream::OnIOComplete, weak_factory_.GetWeakPtr())); } int QuicHttpStream::DoHandlePromiseComplete(int rv) { DCHECK_NE(ERR_IO_PENDING, rv); DCHECK_GE(OK, rv); if (rv != OK) { // rendezvous has failed so proceed as with a non-push request. next_state_ = STATE_REQUEST_STREAM; return OK; } stream_ = quic_session()->ReleasePromisedStream(); spdy::SpdyPriority spdy_priority = ConvertRequestPriorityToQuicPriority(priority_); stream_->SetPriority(spdy_priority); next_state_ = STATE_OPEN; stream_net_log_.AddEvent( NetLogEventType::QUIC_HTTP_STREAM_ADOPTED_PUSH_STREAM, base::Bind(&NetLogQuicPushStreamCallback, stream_->id(), &request_info_->url)); quic_session()->net_log().AddEvent( NetLogEventType::QUIC_HTTP_STREAM_ADOPTED_PUSH_STREAM, base::Bind(&NetLogQuicPushStreamCallback, stream_->id(), &request_info_->url)); return OK; } int QuicHttpStream::SendRequest(const HttpRequestHeaders& request_headers, HttpResponseInfo* response, CompletionOnceCallback callback) { CHECK(!request_body_stream_); CHECK(!response_info_); CHECK(callback_.is_null()); CHECK(!callback.is_null()); CHECK(response); // TODO(rch): remove this once we figure out why channel ID is not being // sent when it should be. HostPortPair origin = HostPortPair::FromURL(request_info_->url); if (origin.Equals(HostPortPair("accounts.google.com", 443)) && request_headers.HasHeader(HttpRequestHeaders::kCookie)) { SSLInfo ssl_info; GetSSLInfo(&ssl_info); UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.CookieSentToAccountsOverChannelId", ssl_info.channel_id_sent); } // In order to rendezvous with a push stream, the session still needs to be // available. Otherwise the stream needs to be available. if ((!found_promise_ && !stream_) || !quic_session()->IsConnected()) return GetResponseStatus(); // Store the serialized request headers. CreateSpdyHeadersFromHttpRequest(*request_info_, request_headers, &request_headers_); // Store the request body. request_body_stream_ = request_info_->upload_data_stream; if (request_body_stream_) { // A request with a body is ineligible for push, so reset the // promised stream and request a new stream. if (found_promise_) { std::string url(request_info_->url.spec()); quic::QuicClientPromisedInfo* promised = quic_session()->GetPushPromiseIndex()->GetPromised(url); if (promised != nullptr) { quic_session()->ResetPromised(promised->id(), quic::QUIC_STREAM_CANCELLED); } } // TODO(rch): Can we be more precise about when to allocate // raw_request_body_buf_. Removed the following check. DoReadRequestBody() // was being called even if we didn't yet allocate raw_request_body_buf_. // && (request_body_stream_->size() || // request_body_stream_->is_chunked())) // Set the body buffer size to be the size of the body clamped // into the range [10 * quic::kMaxPacketSize, 256 * quic::kMaxPacketSize]. // With larger bodies, larger buffers reduce CPU usage. raw_request_body_buf_ = base::MakeRefCounted(static_cast(std::max( 10 * quic::kMaxPacketSize, std::min(request_body_stream_->size(), 256 * quic::kMaxPacketSize)))); // The request body buffer is empty at first. request_body_buf_ = base::MakeRefCounted(raw_request_body_buf_, 0); } // Store the response info. response_info_ = response; int rv; if (!found_promise_) { next_state_ = STATE_SET_REQUEST_PRIORITY; } else if (!request_body_stream_) { next_state_ = STATE_HANDLE_PROMISE; } else { found_promise_ = false; next_state_ = STATE_REQUEST_STREAM; } rv = DoLoop(OK); if (rv == ERR_IO_PENDING) callback_ = std::move(callback); return rv > 0 ? OK : MapStreamError(rv); } int QuicHttpStream::ReadResponseHeaders(CompletionOnceCallback callback) { CHECK(callback_.is_null()); CHECK(!callback.is_null()); int rv = stream_->ReadInitialHeaders( &response_header_block_, base::Bind(&QuicHttpStream::OnReadResponseHeadersComplete, weak_factory_.GetWeakPtr())); if (rv == ERR_IO_PENDING) { // Still waiting for the response, return IO_PENDING. CHECK(callback_.is_null()); callback_ = std::move(callback); return ERR_IO_PENDING; } if (rv < 0) return MapStreamError(rv); // Check if we already have the response headers. If so, return synchronously. if (response_headers_received_) return OK; headers_bytes_received_ += rv; return ProcessResponseHeaders(response_header_block_); } int QuicHttpStream::ReadResponseBody(IOBuffer* buf, int buf_len, CompletionOnceCallback callback) { CHECK(callback_.is_null()); CHECK(!callback.is_null()); CHECK(!user_buffer_.get()); CHECK_EQ(0, user_buffer_len_); // Invalidate HttpRequestInfo pointer. This is to allow the stream to be // shared across multiple transactions which might require this // stream to outlive the request_info_'s owner. // Only allowed when Read state machine starts. It is safe to reset it at // this point since request_info_->upload_data_stream is also not needed // anymore. request_info_ = nullptr; // If the stream is already closed, there is no body to read. if (stream_->IsDoneReading()) return HandleReadComplete(OK); int rv = stream_->ReadBody(buf, buf_len, base::Bind(&QuicHttpStream::OnReadBodyComplete, weak_factory_.GetWeakPtr())); if (rv == ERR_IO_PENDING) { callback_ = std::move(callback); user_buffer_ = buf; user_buffer_len_ = buf_len; return ERR_IO_PENDING; } if (rv < 0) return MapStreamError(rv); return HandleReadComplete(rv); } void QuicHttpStream::Close(bool /*not_reusable*/) { session_error_ = ERR_ABORTED; SaveResponseStatus(); // Note: the not_reusable flag has no meaning for QUIC streams. if (stream_) stream_->Reset(quic::QUIC_STREAM_CANCELLED); ResetStream(); } bool QuicHttpStream::IsResponseBodyComplete() const { return next_state_ == STATE_OPEN && stream_->IsDoneReading(); } bool QuicHttpStream::IsConnectionReused() const { // TODO(rch): do something smarter here. return stream_ && stream_->id() > 1; } int64_t QuicHttpStream::GetTotalReceivedBytes() const { // TODO(sclittle): Currently, this only includes headers and response body // bytes. Change this to include QUIC overhead as well. int64_t total_received_bytes = headers_bytes_received_; if (stream_) { DCHECK_LE(stream_->NumBytesConsumed(), stream_->stream_bytes_read()); // Only count the uniquely received bytes. total_received_bytes += stream_->NumBytesConsumed(); } else { total_received_bytes += closed_stream_received_bytes_; } return total_received_bytes; } int64_t QuicHttpStream::GetTotalSentBytes() const { // TODO(sclittle): Currently, this only includes request headers and body // bytes. Change this to include QUIC overhead as well. int64_t total_sent_bytes = headers_bytes_sent_; if (stream_) { total_sent_bytes += stream_->stream_bytes_written(); } else { total_sent_bytes += closed_stream_sent_bytes_; } return total_sent_bytes; } bool QuicHttpStream::GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const { bool is_first_stream = closed_is_first_stream_; if (stream_) is_first_stream = stream_->IsFirstStream(); if (is_first_stream) { load_timing_info->socket_reused = false; load_timing_info->connect_timing = connect_timing_; } else { load_timing_info->socket_reused = true; } return true; } bool QuicHttpStream::GetAlternativeService( AlternativeService* alternative_service) const { alternative_service->protocol = kProtoQUIC; const HostPortPair& destination = quic_session()->destination(); alternative_service->host = destination.host(); alternative_service->port = destination.port(); return true; } void QuicHttpStream::PopulateNetErrorDetails(NetErrorDetails* details) { details->connection_info = ConnectionInfoFromQuicVersion(quic_session()->GetQuicVersion()); quic_session()->PopulateNetErrorDetails(details); if (quic_session()->IsCryptoHandshakeConfirmed() && stream_) details->quic_connection_error = stream_->connection_error(); } void QuicHttpStream::SetPriority(RequestPriority priority) { priority_ = priority; } void QuicHttpStream::OnReadResponseHeadersComplete(int rv) { DCHECK(callback_); DCHECK(!response_headers_received_); if (rv > 0) { headers_bytes_received_ += rv; rv = ProcessResponseHeaders(response_header_block_); } if (rv != ERR_IO_PENDING && !callback_.is_null()) { DoCallback(rv); } } void QuicHttpStream::ReadTrailingHeaders() { int rv = stream_->ReadTrailingHeaders( &trailing_header_block_, base::Bind(&QuicHttpStream::OnReadTrailingHeadersComplete, weak_factory_.GetWeakPtr())); if (rv != ERR_IO_PENDING) OnReadTrailingHeadersComplete(rv); } void QuicHttpStream::OnReadTrailingHeadersComplete(int rv) { DCHECK(response_headers_received_); if (rv > 0) headers_bytes_received_ += rv; // QuicHttpStream ignores trailers. if (stream_->IsDoneReading()) { // Close the read side. If the write side has been closed, this will // invoke QuicHttpStream::OnClose to reset the stream. stream_->OnFinRead(); SetResponseStatus(OK); } } void QuicHttpStream::OnIOComplete(int rv) { rv = DoLoop(rv); if (rv != ERR_IO_PENDING && !callback_.is_null()) { DoCallback(rv); } } void QuicHttpStream::DoCallback(int rv) { CHECK_NE(rv, ERR_IO_PENDING); CHECK(!callback_.is_null()); CHECK(!in_loop_); // The client callback can do anything, including destroying this class, // so any pending callback must be issued after everything else is done. base::ResetAndReturn(&callback_).Run(MapStreamError(rv)); } int QuicHttpStream::DoLoop(int rv) { CHECK(!in_loop_); base::AutoReset auto_reset_in_loop(&in_loop_, true); std::unique_ptr packet_flusher = quic_session()->CreatePacketBundler( quic::QuicConnection::AckBundling::SEND_ACK_IF_QUEUED); do { State state = next_state_; next_state_ = STATE_NONE; switch (state) { case STATE_HANDLE_PROMISE: CHECK_EQ(OK, rv); rv = DoHandlePromise(); break; case STATE_HANDLE_PROMISE_COMPLETE: rv = DoHandlePromiseComplete(rv); break; case STATE_REQUEST_STREAM: CHECK_EQ(OK, rv); rv = DoRequestStream(); break; case STATE_REQUEST_STREAM_COMPLETE: rv = DoRequestStreamComplete(rv); break; case STATE_SET_REQUEST_PRIORITY: CHECK_EQ(OK, rv); rv = DoSetRequestPriority(); break; case STATE_SEND_HEADERS: CHECK_EQ(OK, rv); rv = DoSendHeaders(); break; case STATE_SEND_HEADERS_COMPLETE: rv = DoSendHeadersComplete(rv); break; case STATE_READ_REQUEST_BODY: CHECK_EQ(OK, rv); rv = DoReadRequestBody(); break; case STATE_READ_REQUEST_BODY_COMPLETE: rv = DoReadRequestBodyComplete(rv); break; case STATE_SEND_BODY: CHECK_EQ(OK, rv); rv = DoSendBody(); break; case STATE_SEND_BODY_COMPLETE: rv = DoSendBodyComplete(rv); break; case STATE_OPEN: CHECK_EQ(OK, rv); break; default: NOTREACHED() << "next_state_: " << next_state_; break; } } while (next_state_ != STATE_NONE && next_state_ != STATE_OPEN && rv != ERR_IO_PENDING); return rv; } int QuicHttpStream::DoRequestStream() { next_state_ = STATE_REQUEST_STREAM_COMPLETE; return quic_session()->RequestStream( !can_send_early_, base::Bind(&QuicHttpStream::OnIOComplete, weak_factory_.GetWeakPtr()), NetworkTrafficAnnotationTag(request_info_->traffic_annotation)); } int QuicHttpStream::DoRequestStreamComplete(int rv) { DCHECK(rv == OK || !stream_); if (rv != OK) { session_error_ = rv; return GetResponseStatus(); } stream_ = quic_session()->ReleaseStream(); DCHECK(stream_); if (!stream_->IsOpen()) { session_error_ = ERR_CONNECTION_CLOSED; return GetResponseStatus(); } if (request_info_->load_flags & LOAD_DISABLE_CONNECTION_MIGRATION_TO_CELLULAR) { stream_->DisableConnectionMigrationToCellularNetwork(); } if (response_info_) { // This happens in the case of a asynchronous push rendezvous // that ultimately fails (e.g. vary failure). |response_info_| // non-null implies that |DoRequestStream()| was called via // |SendRequest()|. next_state_ = STATE_SET_REQUEST_PRIORITY; } return OK; } int QuicHttpStream::DoSetRequestPriority() { // Set priority according to request DCHECK(stream_); DCHECK(response_info_); spdy::SpdyPriority priority = ConvertRequestPriorityToQuicPriority(priority_); stream_->SetPriority(priority); next_state_ = STATE_SEND_HEADERS; return OK; } int QuicHttpStream::DoSendHeaders() { // Log the actual request with the URL Request's net log. stream_net_log_.AddEvent( NetLogEventType::HTTP_TRANSACTION_QUIC_SEND_REQUEST_HEADERS, base::Bind(&QuicRequestNetLogCallback, stream_->id(), &request_headers_, priority_)); DispatchRequestHeadersCallback(request_headers_); bool has_upload_data = request_body_stream_ != nullptr; next_state_ = STATE_SEND_HEADERS_COMPLETE; int rv = stream_->WriteHeaders(std::move(request_headers_), !has_upload_data, nullptr); if (rv > 0) headers_bytes_sent_ += rv; request_headers_ = spdy::SpdyHeaderBlock(); return rv; } int QuicHttpStream::DoSendHeadersComplete(int rv) { if (rv < 0) return rv; next_state_ = request_body_stream_ ? STATE_READ_REQUEST_BODY : STATE_OPEN; return OK; } int QuicHttpStream::DoReadRequestBody() { next_state_ = STATE_READ_REQUEST_BODY_COMPLETE; return request_body_stream_->Read( raw_request_body_buf_.get(), raw_request_body_buf_->size(), base::BindOnce(&QuicHttpStream::OnIOComplete, weak_factory_.GetWeakPtr())); } int QuicHttpStream::DoReadRequestBodyComplete(int rv) { // |rv| is the result of read from the request body from the last call to // DoSendBody(). if (rv < 0) { stream_->Reset(quic::QUIC_ERROR_PROCESSING_STREAM); ResetStream(); return rv; } request_body_buf_ = base::MakeRefCounted(raw_request_body_buf_, rv); if (rv == 0) { // Reached the end. DCHECK(request_body_stream_->IsEOF()); } next_state_ = STATE_SEND_BODY; return OK; } int QuicHttpStream::DoSendBody() { CHECK(request_body_stream_); CHECK(request_body_buf_.get()); const bool eof = request_body_stream_->IsEOF(); int len = request_body_buf_->BytesRemaining(); if (len > 0 || eof) { next_state_ = STATE_SEND_BODY_COMPLETE; quic::QuicStringPiece data(request_body_buf_->data(), len); return stream_->WriteStreamData( data, eof, base::Bind(&QuicHttpStream::OnIOComplete, weak_factory_.GetWeakPtr())); } next_state_ = STATE_OPEN; return OK; } int QuicHttpStream::DoSendBodyComplete(int rv) { if (rv < 0) return rv; request_body_buf_->DidConsume(request_body_buf_->BytesRemaining()); if (!request_body_stream_->IsEOF()) { next_state_ = STATE_READ_REQUEST_BODY; return OK; } next_state_ = STATE_OPEN; return OK; } int QuicHttpStream::ProcessResponseHeaders( const spdy::SpdyHeaderBlock& headers) { if (!SpdyHeadersToHttpResponse(headers, response_info_)) { DLOG(WARNING) << "Invalid headers"; return ERR_QUIC_PROTOCOL_ERROR; } // Put the peer's IP address and port into the response. IPEndPoint address; int rv = quic_session()->GetPeerAddress(&address); if (rv != OK) return rv; response_info_->socket_address = HostPortPair::FromIPEndPoint(address); response_info_->connection_info = ConnectionInfoFromQuicVersion(quic_session()->GetQuicVersion()); response_info_->vary_data.Init(*request_info_, *response_info_->headers.get()); response_info_->was_alpn_negotiated = true; response_info_->alpn_negotiated_protocol = HttpResponseInfo::ConnectionInfoToString(response_info_->connection_info); response_info_->response_time = base::Time::Now(); response_info_->request_time = request_time_; response_headers_received_ = true; // Populate |connect_timing_| when response headers are received. This should // take care of 0-RTT where request is sent before handshake is confirmed. connect_timing_ = quic_session()->GetConnectTiming(); base::ThreadTaskRunnerHandle::Get()->PostTask( FROM_HERE, base::BindOnce(&QuicHttpStream::ReadTrailingHeaders, weak_factory_.GetWeakPtr())); if (stream_->IsDoneReading()) { session_error_ = OK; SaveResponseStatus(); stream_->OnFinRead(); } return OK; } void QuicHttpStream::OnReadBodyComplete(int rv) { CHECK(callback_); user_buffer_ = nullptr; user_buffer_len_ = 0; rv = HandleReadComplete(rv); DoCallback(rv); } int QuicHttpStream::HandleReadComplete(int rv) { if (stream_->IsDoneReading()) { stream_->OnFinRead(); SetResponseStatus(OK); ResetStream(); } return rv; } void QuicHttpStream::ResetStream() { // If |request_body_stream_| is non-NULL, Reset it, to abort any in progress // read. if (request_body_stream_) request_body_stream_->Reset(); if (!stream_) return; DCHECK_LE(stream_->NumBytesConsumed(), stream_->stream_bytes_read()); // Only count the uniquely received bytes. closed_stream_received_bytes_ = stream_->NumBytesConsumed(); closed_stream_sent_bytes_ = stream_->stream_bytes_written(); closed_is_first_stream_ = stream_->IsFirstStream(); } int QuicHttpStream::MapStreamError(int rv) { if (rv == ERR_QUIC_PROTOCOL_ERROR && !quic_session()->IsCryptoHandshakeConfirmed()) { return ERR_QUIC_HANDSHAKE_FAILED; } return rv; } int QuicHttpStream::GetResponseStatus() { SaveResponseStatus(); return response_status_; } void QuicHttpStream::SaveResponseStatus() { if (!has_response_status_) SetResponseStatus(ComputeResponseStatus()); } void QuicHttpStream::SetResponseStatus(int response_status) { has_response_status_ = true; response_status_ = response_status; } int QuicHttpStream::ComputeResponseStatus() const { DCHECK(!has_response_status_); // If the handshake has failed this will be handled by the QuicStreamFactory // and HttpStreamFactory to mark QUIC as broken if TCP is actually working. if (!quic_session()->IsCryptoHandshakeConfirmed()) return ERR_QUIC_HANDSHAKE_FAILED; // If the session was aborted by a higher layer, simply use that error code. if (session_error_ != ERR_UNEXPECTED) return session_error_; // If |response_info_| is null then the request has not been sent, so // return ERR_CONNECTION_CLOSED to permit HttpNetworkTransaction to // retry the request. if (!response_info_) return ERR_CONNECTION_CLOSED; // Explicit stream error are always fatal. if (stream_->stream_error() != quic::QUIC_STREAM_NO_ERROR && stream_->stream_error() != quic::QUIC_STREAM_CONNECTION_ERROR) { return ERR_QUIC_PROTOCOL_ERROR; } return ERR_QUIC_PROTOCOL_ERROR; } } // namespace net