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-= nng_url_parse(3)
-//
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_url_parse - create URL structure from a string
-
-== SYNOPSIS
-
-[source, c]
------------
-#include <nng/nng.h>
-
-int nng_url_parse(nng_url **urlp, const char *str);
------------
-
-== DESCRIPTION
-
-The `nng_url_parse()` function parses the string _str_ containing an
-https://tools.ietf.org/html/rfc3986[RFC 3986] compliant URL, and creates
-a structure containing the results.  A pointer to the resulting structure
-is stored in _urlp_.
-
-The `nng_url` structure has at least the following members:
-
-[source, c]
-----
-struct nng_url {
-    char *u_scheme;   // Scheme, such as "http"; always lower case.
-    char *u_rawurl;   // Unparsed URL, with minimal canonicalization.
-    char *u_userinfo; // Userinfo component, or NULL.
-    char *u_host;     // Full host, including port if present.
-    char *u_hostname; // Hostname only (or address), or empy string.
-    char *u_port;     // Port number, may be default or empty string.
-    char *u_path;     // Path if present, empty string otherwise.
-    char *u_query;    // Query info if present, NULL otherwise.
-    char *u_fragment; // Fragment if present, NULL otherwise.
-    char *u_requri;   // Request-URI (path[?query][#fragment])
-};
-----
-
-=== URL Canonicalization
-
-The `nng_url_parse()` function also canonicalizes the results, as
-follows:
-
-  1. The URL is parsed into the various components.
-  2. The `u_scheme`, `u_hostname`, `u_host`, and `u_port` members are
-     converted to lower case.
-  3. Percent-encoded values for
-     https://tools.ietf.org/html/rfc3986#section-2.3[unreserved characters]
-     converted to their unencoded forms.
-  4. Additionally URL percent-encoded values for characters in the path
-     and with numeric values larger than 127 (i.e. not ASCII) are decoded.
-  5. The resulting `u_path` is checked for invalid UTF-8 sequences, consisting
-     of surrogate pairs, illegal byte sequences, or overlong encodings.
-     If this check fails, then the entire URL is considered invalid, and
-     the function returns `NNG_EINVAL`.
-  6. Path segments consisting of `.` and `..` are resolved as per
-     https://tools.ietf.org/html/rfc3986#section-6.2.2.3[RFC 3986 6.2.2.3].
-  7. Further, empty path segments are removed, meaning that duplicate
-     slash (`/`) separators are removed from the path.
-  8. If a port was not specified, but the scheme defines a default
-     port, then `u_port` will be filled in with the value of the default port.
-
-TIP: Only the `u_userinfo`, `u_query`, and `u_fragment` members will ever be
-     `NULL`.  The other members will be filled in with either default values
-     or the empty string if they cannot be determined from _str_.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-
-== ERRORS
-
-`NNG_ENOMEM`:: Insufficient free memory exists to allocate a message.
-`NNG_EINVAL`:: An invalid URL was supplied.
-
-
-== SEE ALSO
-
-<<nng_url_clone#,nng_url_clone(3)>>,
-<<nng_url_free#,nng_url_free(3)>>,
-<<nng_strerror#,nng_strerror(3)>>,
-<<nng#,nng(7)>>