78 lines
1.6 KiB
Markdown
78 lines
1.6 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_AUTOREFERER
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Section: 3
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Source: libcurl
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See-also:
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- CURLINFO_EFFECTIVE_URL (3)
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- CURLINFO_REDIRECT_URL (3)
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- CURLINFO_REFERER (3)
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- CURLOPT_FOLLOWLOCATION (3)
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- CURLOPT_REFERER (3)
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---
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# NAME
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CURLOPT_AUTOREFERER - automatically update the referer header
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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_AUTOREFERER, long autorefer);
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~~~
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# DESCRIPTION
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Pass a long parameter set to 1 to enable this. When enabled, libcurl
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automatically sets the Referer: header field in HTTP requests to the full URL
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when it follows a Location: redirect to a new destination.
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The automatic referer is set to the full previous URL even when redirects are
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done cross-origin or following redirects to insecure protocols. This is
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considered a minor privacy leak by some.
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With CURLINFO_REFERER(3), applications can extract the actually used
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referer header after the transfer.
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# DEFAULT
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0, disabled
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# PROTOCOLS
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HTTP
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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 res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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/* follow redirects */
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
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/* set Referer: automatically when following redirects */
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curl_easy_setopt(curl, CURLOPT_AUTOREFERER, 1L);
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res = curl_easy_perform(curl);
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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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Along with HTTP
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# RETURN VALUE
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Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
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