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)