138 lines
5.1 KiB
Groff
138 lines
5.1 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 - 2018, 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.haxx.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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.TH libcurl 3 "10 Sep 2018" "libcurl" "libcurl url interface"
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.SH NAME
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libcurl-url \- URL interface overview
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.SH DESCRIPTION
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The URL interface provides a set of functions for parsing and generating URLs.
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.SH INCLUDE
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You still only include <curl/curl.h> in your code. Note that the URL API was
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introduced in 7.62.0.
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.SH CREATE
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Create a handle that holds URL info and resources with \fIcurl_url(3)\fP:
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CURLU *h = curl_url();
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.SH CLEANUP
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When done with it, clean it up with \fIcurl_url_cleanup(3)\fP:
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curl_url_cleanup(h);
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.SH DUPLICATE
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When you need a copy of a handle, just duplicate it with \fIcurl_url_dup(3)\fP:
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CURLU *nh = curl_url_dup(h);
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.SH PARSING
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By "setting" a URL to the handle with \fIcurl_url_set(3)\fP, the URL is parsed
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and stored in the handle. If the URL is not syntactically correct it will
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return an error instead.
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.nf
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rc = curl_url_set(h, CURLUPART_URL,
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"https://example.com:449/foo/bar?name=moo", 0);
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.fi
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The zero in the fourth argument is a bitmask for changing specific features.
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If successful, this stores the URL in its individual parts within the handle.
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.SH REDIRECT
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When a handle already contains info about a URL, setting a relative URL will
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make it "redirect" to adapt to it.
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rc = curl_url_set(h, CURLUPART_URL, "../test?another", 0);
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.SH "GET URL"
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The `CURLU` handle represents a URL and you can easily extract that with
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\fIcurl_url_get(3)\fP:
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char *url;
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rc = curl_url_get(h, CURLUPART_URL, &url, 0);
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curl_free(url);
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The zero in the fourth argument is a bitmask for changing specific features.
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.SH "GET PARTS"
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When a URL has been parsed or parts have been set, you can extract those
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pieces from the handle at any time.
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.nf
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rc = curl_url_get(h, CURLUPART_HOST, &host, 0);
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rc = curl_url_get(h, CURLUPART_SCHEME, &scheme, 0);
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rc = curl_url_get(h, CURLUPART_USER, &user, 0);
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rc = curl_url_get(h, CURLUPART_PASSWORD, &password, 0);
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rc = curl_url_get(h, CURLUPART_PORT, &port, 0);
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rc = curl_url_get(h, CURLUPART_PATH, &path, 0);
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rc = curl_url_get(h, CURLUPART_QUERY, &query, 0);
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rc = curl_url_get(h, CURLUPART_FRAGMENT, &fragment, 0);
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.fi
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Extracted parts are not URL decoded unless the user also asks for it with the
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CURLU_URLDECODE flag set in the fourth bitmask argument.
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Remember to free the returned string with \fIcurl_free(3)\fP when you're done
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with it!
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.SH "SET PARTS"
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A user set individual URL parts, either after having parsed a full URL or
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instead of parsing such.
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.nf
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rc = curl_url_set(urlp, CURLUPART_HOST, "www.example.com", 0);
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rc = curl_url_set(urlp, CURLUPART_SCHEME, "https", 0);
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rc = curl_url_set(urlp, CURLUPART_USER, "john", 0);
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rc = curl_url_set(urlp, CURLUPART_PASSWORD, "doe", 0);
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rc = curl_url_set(urlp, CURLUPART_PORT, "443", 0);
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rc = curl_url_set(urlp, CURLUPART_PATH, "/index.html", 0);
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rc = curl_url_set(urlp, CURLUPART_QUERY, "name=john", 0);
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rc = curl_url_set(urlp, CURLUPART_FRAGMENT, "anchor", 0);
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.fi
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Set parts are not URL encoded unless the user asks for it with the
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`CURLU_URLENCODE` flag.
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.SH "APPENDQUERY"
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An application can append a string to the right end of the query part with the
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`CURLU_APPENDQUERY` flag to \fIcurl_url_set(3)\fP.
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Imagine a handle that holds the URL `https://example.com/?shoes=2`. An
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application can then add the string `hat=1` to the query part like this:
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.nf
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rc = curl_url_set(urlp, CURLUPART_QUERY, "hat=1", CURLU_APPENDQUERY);
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.fi
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It will even notice the lack of an ampersand (`&`) separator so it will inject
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one too, and the handle's full URL will then equal
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`https://example.com/?shoes=2&hat=1`.
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The appended string can of course also get URL encoded on add, and if asked to
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URL encode, the encoding process will skip the '=' character. For example,
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append `candy=N&N` to what we already have, and URL encode it to deal with the
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ampersand in the data:
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.nf
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rc = curl_url_set(urlp, CURLUPART_QUERY, "candy=N&N",
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CURLU_APPENDQUERY | CURLU_URLENCODE);
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.fi
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Now the URL looks like
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.nf
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https://example.com/?shoes=2&hat=1&candy=N%26N`
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.fi
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.SH "SEE ALSO"
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.BR curl_url "(3), " curl_url_cleanup "(3), " curl_url_get "(3), "
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.BR curl_url_dup "(3), " curl_url_set "(3), " CURLOPT_URL "(3), "
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