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85 строки
3.4 KiB
Groff
85 строки
3.4 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_FOLLOWLOCATION 3 "November 26, 2021" "libcurl 7.83.1" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_FOLLOWLOCATION \- follow HTTP 3xx redirects
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FOLLOWLOCATION, long enable);
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.fi
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.SH DESCRIPTION
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A long parameter set to 1 tells the library to follow any Location: header
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that the server sends as part of an HTTP header in a 3xx response. The
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Location: header can specify a relative or an absolute URL to follow.
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libcurl will issue another request for the new URL and follow new Location:
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headers all the way until no more such headers are returned.
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\fICURLOPT_MAXREDIRS(3)\fP can be used to limit the number of redirects
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libcurl will follow.
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libcurl limits what protocols it automatically follows to. The accepted
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protocols are set with \fICURLOPT_REDIR_PROTOCOLS(3)\fP. By default libcurl
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will allow HTTP, HTTPS, FTP and FTPS on redirect (7.65.2). Older versions of
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libcurl allowed all protocols on redirect except those disabled for security
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reasons: Since 7.19.4 FILE and SCP are disabled, and since 7.40.0 SMB and SMBS
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are also disabled.
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When following a Location:, the 3xx response code that redirected it also
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dictates which request method it will use in the subsequent request: For 301,
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302 and 303 responses libcurl will switch method from POST to GET unless
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\fICURLOPT_POSTREDIR(3)\fP instructs libcurl otherwise. All other 3xx codes
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will make libcurl send the same method again.
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For users who think the existing location following is too naive, too simple
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or just lacks features, it is easy to instead implement your own redirect
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follow logic with the use of \fIcurl_easy_getinfo(3)\fP's
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\fICURLINFO_REDIRECT_URL(3)\fP option instead of using
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\fICURLOPT_FOLLOWLOCATION(3)\fP.
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.SH DEFAULT
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0, disabled
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.SH PROTOCOLS
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HTTP(S)
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* example.com is redirected, so we tell libcurl to follow redirection */
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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Along with HTTP
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.SH RETURN VALUE
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Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_REDIR_PROTOCOLS "(3), " CURLOPT_PROTOCOLS "(3), "
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.BR CURLOPT_POSTREDIR "(3), "
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.BR CURLINFO_REDIRECT_URL "(3), " CURLINFO_REDIRECT_COUNT "(3), "
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