I’ve been using cURL (through PHP) to build a sort of proxy for a project I’m working on. I need to parse the returned headers (to recover the HTTP status), so had included a very simple script to do so. It had worked fine in the past, but for some reason barfed in this case. A closer look at what was being returned revealed that for some reason, Apache was prepending the ‘normal’ headers with an extra response header:
HTTP/1.1 100 Continue HTTP/1.1 200 OK Date: Fri, 09 Jun 2006 15:23:42 GMT Server: Apache ...
A bit of Googling revealed that this was to do with a header that cURL sends by default:
…which in turns tells Apache to send the extra header. I poked around a fair bit but couldn’t quite find a workable solution short of manually removing the header in PHP, which seemed a bit clumsy. Finally, on a hunch I tried this:
curl_setopt( $curl_handle, CURLOPT_HTTPHEADER, array( 'Expect:' ) );
…which basically overrides the original ‘Expect:’ header with an empty one.
Hope this helps someone.