NAME

       CURLOPT_SUPPRESS_CONNECT_HEADERS - suppress proxy CONNECT response headers

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SUPPRESS_CONNECT_HEADERS, long onoff);

DESCRIPTION

       When  CURLOPT_HTTPPROXYTUNNEL(3)  is  used and a CONNECT request is made, suppress proxy CONNECT response
       headers from the user callback functions CURLOPT_HEADERFUNCTION(3) and CURLOPT_WRITEFUNCTION(3).

       Proxy CONNECT response headers can complicate header processing since it is essentially a separate set of
       headers. You can enable this option to suppress those headers.

       For  example let's assume an HTTPS URL is to be retrieved via CONNECT. On success there would normally be
       two sets of headers, and each header line sent to the header function and/or the write function. The data
       given to the callbacks would look like this:

       HTTP/1.1 200 Connection established
       {headers}
       ...

       HTTP/1.1 200 OK
       Content-Type: application/json
       {headers}
       ...

       {body}
       ...

       However  by  enabling  this  option the CONNECT response headers are suppressed, so the data given to the
       callbacks would look like this:

       HTTP/1.1 200 OK
       Content-Type: application/json
       {headers}
       ...

       {body}
       ...

DEFAULT

       0

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
           curl_easy_setopt(curl, CURLOPT_PROXY, "http://foo:3128");
           curl_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
           curl_easy_setopt(curl, CURLOPT_SUPPRESS_CONNECT_HEADERS, 1L);

           curl_easy_perform(curl);

           /* always cleanup */
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.54.0

RETURN VALUE

       CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.

SEE ALSO

       CURLOPT_HEADER(3), CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PROXY(3)