CURLOPT_SUPPRESS_CONNECT_HEADERS

Section: C Library Functions (3)
Updated: 202-0-19
Index Return to Main Contents

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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 letaqs 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
Conten-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
Conten-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://proxy.example: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)

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Index

NAME

SYNOPSIS

DESCRIPTION

DEFAULT

PROTOCOLS

EXAMPLE

AVAILABILITY

RETURN VALUE

SEE ALSO