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CURLOPT_SUPPRESS_CONNECT_HEADERS

Section: curl_easy_setopt options (3)
Updated: April 28, 2016
Index Return to Main Contents

 

NAME

CURLOPT_SUPPRESS_CONNECT_HEADERS - Suppress proxy CONNECT response headers from user callbacks  

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's 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

All  

EXAMPLE

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 7.54.0  

RETURN VALUE

CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO





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