unsigned long long PerformanceTiming::responseStart() const { ResourceLoadTiming* timing = resourceLoadTiming(); if (!timing || timing->receiveHeadersEnd() == 0.0) return requestStart(); // FIXME: Response start needs to be the time of the first received byte. // However, the ResourceLoadTiming API currently only supports the time // the last header byte was received. For many responses with reasonable // sized cookies, the HTTP headers fit into a single packet so this time // is basically equivalent. But for some responses, particularly those with // headers larger than a single packet, this time will be too late. return monotonicTimeToIntegerMilliseconds(timing->receiveHeadersEnd()); }
void PerformanceBase::addResourceTiming(const ResourceTimingInfo& info) { if (isResourceTimingBufferFull() && !hasObserverFor(PerformanceEntry::Resource)) return; SecurityOrigin* securityOrigin = nullptr; ExecutionContext* context = getExecutionContext(); if (context) securityOrigin = context->getSecurityOrigin(); if (!securityOrigin) return; const ResourceResponse& finalResponse = info.finalResponse(); bool allowTimingDetails = passesTimingAllowCheck(finalResponse, *securityOrigin, info.originalTimingAllowOrigin(), context); double startTime = info.initialTime(); if (info.redirectChain().isEmpty()) { PerformanceEntry* entry = PerformanceResourceTiming::create( info, timeOrigin(), startTime, allowTimingDetails); notifyObserversOfEntry(*entry); if (!isResourceTimingBufferFull()) addResourceTimingBuffer(*entry); return; } const Vector<ResourceResponse>& redirectChain = info.redirectChain(); bool allowRedirectDetails = allowsTimingRedirect(redirectChain, finalResponse, *securityOrigin, context); if (!allowRedirectDetails) { ResourceLoadTiming* finalTiming = finalResponse.resourceLoadTiming(); ASSERT(finalTiming); if (finalTiming) startTime = finalTiming->requestTime(); } ResourceLoadTiming* lastRedirectTiming = redirectChain.back().resourceLoadTiming(); ASSERT(lastRedirectTiming); double lastRedirectEndTime = lastRedirectTiming->receiveHeadersEnd(); PerformanceEntry* entry = PerformanceResourceTiming::create( info, timeOrigin(), startTime, lastRedirectEndTime, allowTimingDetails, allowRedirectDetails); notifyObserversOfEntry(*entry); if (!isResourceTimingBufferFull()) addResourceTimingBuffer(*entry); }