diff options
Diffstat (limited to 'docs/libcurl/libgnurl-url.3')
| -rw-r--r-- | docs/libcurl/libgnurl-url.3 | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/docs/libcurl/libgnurl-url.3 b/docs/libcurl/libgnurl-url.3 new file mode 100644 index 000000000..bdf82ec15 --- /dev/null +++ b/docs/libcurl/libgnurl-url.3 @@ -0,0 +1,137 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. +.\" * +.\" * This software is licensed as described in the file COPYING, which +.\" * you should have received as part of this distribution. The terms +.\" * are also available at https://curl.haxx.se/docs/copyright.html. +.\" * +.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell +.\" * copies of the Software, and permit persons to whom the Software is +.\" * furnished to do so, under the terms of the COPYING file. +.\" * +.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY +.\" * KIND, either express or implied. +.\" * +.\" ************************************************************************** +.TH libcurl 3 "10 Sep 2018" "libcurl" "libcurl url interface" +.SH NAME +libcurl-url \- URL interface overview +.SH DESCRIPTION +The URL interface provides a set of functions for parsing and generating URLs. +.SH INCLUDE +You still only include <gnurl/curl.h> in your code. Note that the URL API was +introduced in 7.62.0. +.SH CREATE +Create a handle that holds URL info and resources with \fIcurl_url(3)\fP: + + CURLU *h = curl_url(); +.SH CLEANUP +When done with it, clean it up with \fIcurl_url_cleanup(3)\fP: + + curl_url_cleanup(h); +.SH DUPLICATE +When you need a copy of a handle, just duplicate it with \fIcurl_url_dup(3)\fP: + + CURLU *nh = curl_url_dup(h); +.SH PARSING +By "setting" a URL to the handle with \fIcurl_url_set(3)\fP, the URL is parsed +and stored in the handle. If the URL is not syntactically correct it will +return an error instead. + +.nf + rc = curl_url_set(h, CURLUPART_URL, + "https://example.com:449/foo/bar?name=moo", 0); +.fi + +The zero in the fourth argument is a bitmask for changing specific features. + +If successful, this stores the URL in its individual parts within the handle. +.SH REDIRECT +When a handle already contains info about a URL, setting a relative URL will +make it "redirect" to adapt to it. + + rc = curl_url_set(h, CURLUPART_URL, "../test?another", 0); +.SH "GET URL" +The `CURLU` handle represents a URL and you can easily extract that with +\fIcurl_url_get(3)\fP: + + char *url; + rc = curl_url_get(h, CURLUPART_URL, &url, 0); + curl_free(url); + +The zero in the fourth argument is a bitmask for changing specific features. +.SH "GET PARTS" +When a URL has been parsed or parts have been set, you can extract those +pieces from the handle at any time. + +.nf + rc = curl_url_get(h, CURLUPART_HOST, &host, 0); + rc = curl_url_get(h, CURLUPART_SCHEME, &scheme, 0); + rc = curl_url_get(h, CURLUPART_USER, &user, 0); + rc = curl_url_get(h, CURLUPART_PASSWORD, &password, 0); + rc = curl_url_get(h, CURLUPART_PORT, &port, 0); + rc = curl_url_get(h, CURLUPART_PATH, &path, 0); + rc = curl_url_get(h, CURLUPART_QUERY, &query, 0); + rc = curl_url_get(h, CURLUPART_FRAGMENT, &fragment, 0); +.fi + +Extracted parts are not URL decoded unless the user also asks for it with the +CURLU_URLDECODE flag set in the fourth bitmask argument. + +Remember to free the returned string with \fIcurl_free(3)\fP when you're done +with it! +.SH "SET PARTS" +A user set individual URL parts, either after having parsed a full URL or +instead of parsing such. + +.nf + rc = curl_url_set(urlp, CURLUPART_HOST, "www.example.com", 0); + rc = curl_url_set(urlp, CURLUPART_SCHEME, "https", 0); + rc = curl_url_set(urlp, CURLUPART_USER, "john", 0); + rc = curl_url_set(urlp, CURLUPART_PASSWORD, "doe", 0); + rc = curl_url_set(urlp, CURLUPART_PORT, "443", 0); + rc = curl_url_set(urlp, CURLUPART_PATH, "/index.html", 0); + rc = curl_url_set(urlp, CURLUPART_QUERY, "name=john", 0); + rc = curl_url_set(urlp, CURLUPART_FRAGMENT, "anchor", 0); +.fi + +Set parts are not URL encoded unless the user asks for it with the +`CURLU_URLENCODE` flag. +.SH "APPENDQUERY" +An application can append a string to the right end of the query part with the +`CURLU_APPENDQUERY` flag to \fIcurl_url_set(3)\fP. + +Imagine a handle that holds the URL `https://example.com/?shoes=2`. An +application can then add the string `hat=1` to the query part like this: + +.nf + rc = curl_url_set(urlp, CURLUPART_QUERY, "hat=1", CURLU_APPENDQUERY); +.fi + +It will even notice the lack of an ampersand (`&`) separator so it will inject +one too, and the handle's full URL will then equal +`https://example.com/?shoes=2&hat=1`. + +The appended string can of course also get URL encoded on add, and if asked to +URL encode, the encoding process will skip the '=' character. For example, +append `candy=N&N` to what we already have, and URL encode it to deal with the +ampersand in the data: + +.nf + rc = curl_url_set(urlp, CURLUPART_QUERY, "candy=N&N", + CURLU_APPENDQUERY | CURLU_URLENCODE); +.fi + +Now the URL looks like +.nf + https://example.com/?shoes=2&hat=1&candy=N%26N` +.fi +.SH "SEE ALSO" +.BR curl_url "(3), " curl_url_cleanup "(3), " curl_url_get "(3), " +.BR curl_url_dup "(3), " curl_url_set "(3), " CURLOPT_URL "(3), " |