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POPHP POST variable not defined when using Chrome + XHR
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14126633
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2013-01-02T17:44:52.720
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2013-01-26T15:29:32.423
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2017-05-23T11:43:06.797
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Body
<p>This question is nearly identical to the year-old unanswered question: </p> <p><a href="https://stackoverflow.com/questions/8033263/http-post-xhr-not-working-in-chrome">HTTP-POST XHR not working in chrome</a>.</p> <p>I was hoping to find a solution and can offer more details than the original question.</p> <p><strong>Background</strong></p> <p>I have a sever-side php script that is supposed to take POST data from a form or XHR request. When I test the site using a form for submission, it works in Chrome and IE9. However, when I generate the request using XHR, the php POST variable is undefined when using Chrome on the client side. This behavior is inconsistent: about 1 in 20 tries, the php does accept the data.</p> <p>I have checked the <code>php://input</code> stream and see that the post data is being sent to server in all cases; and note that a small few of the HTTP headers (<code>$_SERVER</code>) are different between test cases.</p> <p><strong>Code</strong></p> <p>Server side:</p> <pre><code><?php echo file_get_contents("php://input") . "\n"; print_r($_SERVER); print_r($_POST); ?> </code></pre> <p>Client side form version (Chrome and IE9 both work)</p> <pre><code><form action="scriptName.php" method="post"> Field: <input type="text" name="myField"><br> <input type="submit" value="Submit"> </form> </code></pre> <p>Client side XHR version (IE9 always works, Chrome works about 5% of time)</p> <pre><code><script> function postToURL(url,data) { // Typical XHLHttpRequest declarations are removed for brevity // - checks browser type and declares xmlhttp accordingly // - defines a onreadystatechange handle xmlhttp.open("POST",url,false); xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xmlhttp.send(data); } </script> ... <form> <button type="button" onClick="postToURL('scriptname.php','myField=test');"> Test </button> </form> </code></pre> <p><strong>Output</strong></p> <p>In all cases the request body data (<code>php://input</code>) returns the same value. The headers are mostly the same, but Chrome adds an <code>[HTTP_PRAGMA] => no-cache</code> in XHR mode</p> <p>The <code>$_POST</code> variable is defined as <code>[myField] => test</code> except in the Chrome + XHR case.</p> <p><strong>Questions</strong></p> <p>Where is the problem likely occurring? Is there something wrong with the HTTP headers possibly, or should I be looking server-side. Any ideas?</p>
Tags
<php><javascript><google-chrome><xmlhttprequest>
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PHP POST variable not defined when using Chrome + XHR
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