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POMax length of send() data param on XMLHttpRequest Post
 

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    <p>Is there a documented max to the length of the string data you can use in the send method of an XMLHttpRequest for the major browser implementations?</p> <p>I am running into an issue with a JavaScript XMLHttpRequest Post failing in FireFox 3 when the data is over approx 3k. I was assuming the Post would behave the same as a conventional Form Post.</p> <p>The W3C docs mention the data param of the send method is a DOMString but I am not sure how the major browsers implement that.</p> <p>Here is a simplified version of my JavaScript, if bigText is over about 3k it fails, otherwise it works...</p> <pre><code>var xhReq = createXMLHttpRequest(); function createXMLHttpRequest() { try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {} try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} try { return new XMLHttpRequest(); } catch(e) {} alert("XMLHttpRequest not supported"); return null; } function mySubmit(id, bigText) { var url = "SubmitPost.cfm"; var params = "id=" + id + "&amp;bigtext=" + encodeURI(bigText); xhReq.open("POST", url, true); //Send the header information along with the request xhReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xhReq.setRequestHeader("Content-length", params.length); xhReq.setRequestHeader("Connection", "close"); xhReq.onreadystatechange = onPostSubmit; xhReq.send(params); } function onPostSubmit() { if (xhReq.readyState==4 || xhReq.readyState=="complete") { if (xhReq.status != 200) { alert('BadStatus'); return; } } } </code></pre>
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