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See header file and man pages for API. All documented API details work
and are tested in the 1560 test case.

Closes #2842
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.\" **************************************************************************
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.\" *
.\" * 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 curl_url_set 3 "6 Aug 2018" "libcurl" "libcurl Manual"
.SH NAME
curl_url_set - set a part from a URL
.SH SYNOPSIS
.B #include <curl/curl.h>
CURLUcode curl_url_set(CURLU *url,
CURLUPart part,
const char *content,
unsigned int flags)
.fi
.SH DESCRIPTION
Given the \fIurl\fP handle of an already parsed URL, this function lets the
user set/update individual pieces of it.
The \fIpart\fP argument should identify the particular URL part (see list
below) to set or change, with \fIcontent\fP pointing to a zero terminated
string with the new contents for that URL part. The contents should be in the
form and encoding they'd use in a URL: URL encoded.
Setting a part to a NULL pointer will effectively remove that part's contents
from the CURLU handle.
The \fIflags\fP argument is a bitmask with independent features.
.SH PARTS
.IP CURLUPART_URL
Allows the full URL of the handle to be replaced. If the handle already is
populated with a URL, the new URL can be relative to the previous.
When successfully setting a new URL, relative or absolute, the handle contents
will be replaced with the information of the newly set URL.
Pass a pointer to a zero terminated string to the \fIurl\fP parameter. The
string must point to a correctly formatted "RFC 3986+" URL or be a NULL
pointer.
.IP CURLUPART_SCHEME
Scheme cannot be URL decoded on set.
.IP CURLUPART_USER
.IP CURLUPART_PASSWORD
.IP CURLUPART_OPTIONS
.IP CURLUPART_HOST
The host name can use IDNA. The string must then be encoded as your locale
says or UTF-8 (when winidn is used).
.IP CURLUPART_PORT
Port cannot be URL encoded on set.
.IP CURLUPART_PATH
If a path is set in the URL without a leading slash, a slash will be inserted
automatically when this URL is read from the handle.
.IP CURLUPART_QUERY
The query part will also get spaces converted to pluses when asked to URL
encode on set with the CURLU_URLENCODE bit.
If used in with \fICURLU_APPENDQUERY\fP, the provided part will be appended on
the end of the existing query - and if the previous part didn't end with an
ampersand (&), an ampersand will be inserted before the new appended part.
When \fCURLU_APPENDQUERY\fP is used together with \fICURLU_URLENCODE\fP,
the '=' symbols will not be URL encoded.
The question mark in the URL is not part of the actual query contents.
.IP CURLUPART_FRAGMENT
The hash sign in the URL is not part of the actual fragment contents.
.SH FLAGS
The flags argument is zero, one or more bits set in a bitmask.
.IP CURLU_NON_SUPPORT_SCHEME
If set, allows \fIcurl_url_set(3)\fP to set a non-supported scheme.
.IP CURLU_URLENCODE
When set, \fIcurl_url_set(3)\fP URL encodes the part on entry, except for
scheme, port and URL.
When setting the path component with URL encoding enabled, the slash character
will be skipped.
The query part gets space-to-plus conversion before the URL conversion.
This URL encoding is charset unaware and will convert the input on a
byte-by-byte manner.
.SH RETURN VALUE
Returns a CURLUcode error value, which is CURLUE_OK (0) if everything went
fine.
If this function returns an error, no URL part is returned.
.SH EXAMPLE
.nf
CURLUcode rc;
CURLU *url = curl_url();
rc = curl_url_set(url, CURLUPART_URL, "https://example.com", 0);
if(!rc) {
char *scheme;
/* change it to an FTP URL */
rc = curl_url_set(url, CURLUPART_SCHEME, "ftp", 0);
}
curl_url_cleanup(url);
.fi
.SH AVAILABILITY
Added in curl 7.63.0
.SH "SEE ALSO"
.BR curl_url_cleanup "(3), " curl_url "(3), " curl_url_get "(3), "
.BR curl_url_dup "(3), "