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deps/curl/docs/libcurl/opts/CURLOPT_SUPPRESS_CONNECT_HEADERS.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SUPPRESS_CONNECT_HEADERS
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_HEADER (3)
+  - CURLOPT_HTTPPROXYTUNNEL (3)
+  - CURLOPT_PROXY (3)
+---
+
+# NAME
+
+CURLOPT_SUPPRESS_CONNECT_HEADERS - suppress proxy CONNECT response headers
+
+# SYNOPSIS
+
+~~~c
+#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:
+
+~~~c
+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:
+
+~~~c
+HTTP/1.1 200 OK
+Content-Type: application/json
+{headers}
+...
+
+{body}
+...
+~~~
+
+# DEFAULT
+
+0
+
+# PROTOCOLS
+
+All
+
+# EXAMPLE
+
+~~~c
+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 7.54.0
+
+# RETURN VALUE
+
+CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.