Handling HTTP code 417: Expectation failed

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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.


The ServicePointManager has a property named Expect100Continue. Set this to false.

System.Net.ServicePointManager.Expect100Continue = false;


If you're using PHP's curl, manually empty the Expect header.

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));