417 Expectation Failed Cast Iron
May 4, 2010
We're migrating lots of users from Cast Iron 3.6.2.5 to Cast Iron 4.0.5.1. We're having lots of trouble with the Expect header.
417 Expectation Failed
The expectation given in the Expect request-header
field could not be met by this server.
The client sent
Expect: 100-continue
but we only allow the 100-continue expectation.
which makes a lot of sense! (You sent this, we only support...er, exactly what you sent!)
We're having to get clients to remove this header.
.NET
The System.Net.ServicePointManager class has a static property named Expect100Continue. Setting this to false will stop the header "Expect: 100-Continue" from being sent.
Curl
You can use the -H option of curl to turn off the Expect header. eg: -H 'Expect: '
PHP cURL
Add this option to the source:
curl_setopt( $curl_handle, CURLOPT_HTTPHEADER, array( 'Expect:' ) );
