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Workaround in PHP cURL for the 100-continue expectation
// cURL obeys the RFCs as it should. Meaning that for a HTTP/1.1 backend if the POST size is above 1024 bytes
// cURL sends a 'Expect: 100-continue' header. The server acknowledges and sends back the '100' status code.
// cuRL then sends the request body. This is proper behaviour. Nginx supports this header.
// This allows to work around servers that do not support that header.
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));
// We're emptying the 'Expect' header, saying to the server: please accept the body right now.
// Read here:
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