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

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PROXYHEADER
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_HEADEROPT (3)
+  - CURLOPT_HTTPHEADER (3)
+---
+
+# NAME
+
+CURLOPT_PROXYHEADER - set of HTTP headers to pass to proxy
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYHEADER,
+                          struct curl_slist *headers);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer to a linked list of HTTP headers to pass in your HTTP request
+sent to a proxy. The rules for this list is identical to the
+CURLOPT_HTTPHEADER(3) option's.
+
+The headers set with this option is only ever used in requests sent to a proxy
+- when there is also a request sent to a host.
+
+The first line in a request (containing the method, usually a GET or POST) is
+NOT a header and cannot be replaced using this option. Only the lines
+following the request-line are headers. Adding this method line in this list
+of headers causes your request to send an invalid header.
+
+Pass a NULL to this to reset back to no custom headers.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+HTTP
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+
+  struct curl_slist *list;
+
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+    curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy.example.com:80");
+
+    list = curl_slist_append(NULL, "Shoesize: 10");
+    list = curl_slist_append(list, "Accept:");
+
+    curl_easy_setopt(curl, CURLOPT_PROXYHEADER, list);
+
+    curl_easy_perform(curl);
+
+    curl_slist_free_all(list); /* free the list again */
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.37.0
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.