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POXMLHttpRequest fails with HTTPS / MSIE 10 / POST / Lots of requests
 

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  1. POXMLHttpRequest fails with HTTPS / MSIE 10 / POST / Lots of requests
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    <p>I've got some software that works well in a lot of cases, but fails badly with MSIE 10. I've broken it down to the simplest test case I can, shown below. XMLHttpRequest will sometimes work, but more often it will wait for 5 to 10 seconds (that times changes constantly) and then return with a status code 0.</p> <p>It is only the <strong>combination</strong> of HTTPS &amp; MSIE 10 &amp; Lots of POST requests. Changing any one of these will cause things to work again.</p> <ul> <li>Other browsers work fine, including MSIE 8. It's not a server problem. I can have 10 copies of the test program running at once on chrome with no issues.</li> <li>It's only HTTPS. When I switch to HTTP everything works fine. (The same server is listening to both ports, serving the same software.) My temporary work around is showing people the HTTP address, but I don't like that.</li> <li>This only happens with a POST request. When I change my test program to do a GET instead of a POST, everything works fine. Unfortunately that's not an option for the real program.</li> <li>This only happens after a lot of continuous requests. Often it will be fine for a few requests, then start failing. Hitting refresh doesn't help. It's like the browser, not my script, is having trouble.</li> </ul> <p>Has anyone seen a problem like that? Do you know how to fix it?</p> <pre><code>&lt;HTML&gt; &lt;HEAD&gt; &lt;TITLE&gt;test&lt;/TITLE&gt; &lt;SCRIPT&gt; &lt;!-- var count = 0; function addLine(line) { var newDiv = document.createElement("div"); newDiv.innerText = line; document.body.appendChild(newDiv); } function my_main() { addLine("script started"); scheduleRequest(); } function scheduleRequest() { try { if (count &lt; 50) { count++; //setTimeout(sendRequest, 1); sendRequest(); } else addLine("Done!"); } catch (err) { addLine("Exception in scheduleRequest(): " + err.message); } } function sendRequest() { try { var xmlhttp = new XMLHttpRequest(); xmlhttp.open("POST","t.php?nocache="+Math.random(),true); xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState == 4) { var success = (xmlhttp.responseText == "yes\n") &amp;&amp; (xmlhttp.status == 200); var status = "#" + count + ": "; if (success) status += "success."; else status += "FAIL. status=" + xmlhttp.status; addLine(status); scheduleRequest(); } } xmlhttp.send("sequence=5"); } catch (err) { addLine("Exception in sendRequest(): " + err.message); } } --&gt; &lt;/SCRIPT&gt; &lt;/HEAD&gt; &lt;BODY ONLOAD="my_main()"&gt; &lt;div&gt;Let's go!&lt;/div&gt; &lt;/BODY&gt; &lt;/HTML&gt; </code></pre>
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    1. USTrade-Ideas Philip
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    1. COJust curious if you look in the Network tab of the `F12` developer tools do you see all the requests (POSTs) go to your server? (e.g. do they all get submitted or are some missed?)
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      1. POXMLHttpRequest fails with HTTPS / MSIE 10 / POST / Lots of requests
      1. USscunliffe
    2. COPOST requests do not cache so the random number does not matter. Also random numbers can repeat so that can fail. ;)
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      1. POXMLHttpRequest fails with HTTPS / MSIE 10 / POST / Lots of requests
      1. USepascarello
    3. COPlease also keep in mind that `.innerText` has compatibility issues: http://www.quirksmode.org/dom/w3c_html.html#t04 (e.g. not supported in Firefox) the W3C `.textContent` of course isn't fully supported in IE either. :-P In this case (a `div`) I'd just set the `.innerHTML` as it will work in all browsers consistently.
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      1. POXMLHttpRequest fails with HTTPS / MSIE 10 / POST / Lots of requests
      1. USscunliffe
 

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