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54ded66618
- always assign the curl_easy_perform() return code (and declare the necessary 'result' variable for it) - always call curl_easy_cleanup() on the created easy handles Closes #21364
103 lines
2.1 KiB
Markdown
103 lines
2.1 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SUPPRESS_CONNECT_HEADERS
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HEADER (3)
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- CURLOPT_HTTPPROXYTUNNEL (3)
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- CURLOPT_PROXY (3)
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Protocol:
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- All
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Added-in: 7.54.0
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---
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# NAME
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CURLOPT_SUPPRESS_CONNECT_HEADERS - suppress proxy CONNECT response headers
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SUPPRESS_CONNECT_HEADERS, long onoff);
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~~~
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# DESCRIPTION
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When CURLOPT_HTTPPROXYTUNNEL(3) is used and a CONNECT request is made,
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suppress proxy CONNECT response headers from the user callback functions
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CURLOPT_HEADERFUNCTION(3) and CURLOPT_WRITEFUNCTION(3).
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Proxy CONNECT response headers can complicate header processing since it is
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essentially a separate set of headers. You can enable this option to suppress
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those headers.
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For example let's assume an HTTPS URL is to be retrieved via CONNECT. On
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success there would normally be two sets of headers, and each header line sent
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to the header function and/or the write function. The data given to the
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callbacks would look like this:
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~~~c
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HTTP/1.1 200 Connection established
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{headers}
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...
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HTTP/1.1 200 OK
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Content-Type: application/json
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{headers}
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...
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{body}
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...
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~~~
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However by enabling this option the CONNECT response headers are suppressed,
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so the data given to the callbacks would look like this:
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~~~c
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HTTP/1.1 200 OK
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Content-Type: application/json
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{headers}
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...
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{body}
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...
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~~~
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# DEFAULT
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0
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode result;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
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curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy.example:3128");
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curl_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
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curl_easy_setopt(curl, CURLOPT_SUPPRESS_CONNECT_HEADERS, 1L);
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result = curl_easy_perform(curl);
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.
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