http://api-wiki.apps.rackspace.com/api-wiki/index.php?action=history&feed=atom&title=Handling_HTTP_code_417%3A_Expectation_failedHandling HTTP code 417: Expectation failed - Revision history2026-05-29T20:53:56ZRevision history for this page on the wikiMediaWiki 1.29.1http://api-wiki.apps.rackspace.com/api-wiki/index.php?title=Handling_HTTP_code_417:_Expectation_failed&diff=390&oldid=prevZhen.wei: add http 417 error page2010-06-15T18:02:16Z<p>add http 417 error page</p>
<p><b>New page</b></p><div>Some HTTP libraries automatically add a header named Expect and fill it with '100-continue'. If your program is getting the HTTP status code 417 you will need to disable the header using your language's library.<br />
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'''.NET'''<br />
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The ServicePointManager has a property named Expect100Continue. Set this to false.<br />
<pre>System.Net.ServicePointManager.Expect100Continue = false;</pre><br />
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'''PHP'''<br />
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If you're using PHP's curl, manually empty the Expect header.<br />
<pre>curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));</pre></div>Zhen.wei