[Webkit-unassigned] [Bug 163814] New: WKWebView and WebView no longer allow async XMLHttpRequest timeout to exceed 60 seconds

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Oct 21 15:27:04 PDT 2016


            Bug ID: 163814
           Summary: WKWebView and WebView no longer allow async
                    XMLHttpRequest timeout to exceed 60 seconds
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dasau at microsoft.com

WKWebView and WebView control do not allow XMLHttpRequest timeout to be greater than 60 seconds. The below code can repro, this was not an issue with the version of WebKit that was shipped in OSX 10.11.5, but it does not work in 10.12.1.
var xhr = new XMLHttpRequest();
var startTime = new Date();
xhr.open('GET', url, true);

xhr.timeout = 120000; // time in milliseconds

xhr.onload = function () {

xhr.ontimeout = function (e) {
  console.error((new Date() - startTime) + " milliseconds timeout."); // 60000 milliseconds timeout.


I believe the relevant code in WebKit is below, for asynchronous requests m_timeoutInterval is not getting set so it is using NSUrlRequest default timeoutInterval of 60 seconds.

XMLHttpRequest::createRequest(ExceptionCode& ec)

    if (m_timeoutMilliseconds) {
        if (!m_async)
            request.setTimeoutInterval(m_timeoutMilliseconds / 1000.0);
        else {
            m_sendingTime = std::chrono::steady_clock::now();
            m_timeoutTimer.startOneShot(std::chrono::milliseconds { m_timeoutMilliseconds });


    double timeoutInterval = ResourceRequestBase::timeoutInterval();
    if (timeoutInterval)
        [nsRequest setTimeoutInterval:timeoutInterval];

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