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# nng_url | ||
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## NAME | ||
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nng_url --- Universal Resource Locator object | ||
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## SYNOPSIS | ||
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```c | ||
#include <nng/nng.h> | ||
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typedef struct nng_url { | ||
char *u_rawurl; | ||
char *u_scheme; | ||
char *u_userinfo; | ||
char *u_host; | ||
char *u_hostname; | ||
char *u_port; | ||
char *u_path; | ||
char *u_query; | ||
char *u_fragment; | ||
char *u_requri; | ||
} nng_url; | ||
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int nng_url_parse(nng_url **urlp, const char *str); | ||
int nng_url_clone(nng_url **dup, nng_url *url); | ||
void nng_url_free(nng_url *url); | ||
``` | ||
## DESCRIPTION | ||
An {{i:`nng_url`}}{{hi:URL}}{{hi:Universal Resource Locator}} is a structure used for representing URLs. | ||
These structures are created by parsing string formatted URLs with {{i:`nng_url_parse`}}. | ||
An `nng_url` may be cloned using the {{i:`nng_url_clone`}} function. | ||
The original _url_ is duplicated into the location specified by _dup_. | ||
When no longer needed, `nng_url` objects may be freed using {{i:`nng_url_free`}}. | ||
> [!IMPORTANT] | ||
> Only `nng_url_free` should be used to deallocate `nng_url` objects. | ||
### URL Fields | ||
Applications may access individual fields, but must not free or | ||
alter them, as the underlying memory is managed by the library. | ||
The fields of an `nng_url` object are as follows: | ||
- `u_rawurl`: The unparsed URL string. This will never be `NULL`. | ||
- `u_scheme`: The URL scheme, such as "http" or "inproc". Always lower case. This will never be `NULL`. | ||
- `u_userinfo`: This username and password if supplied in the URL string. Will be `NULL` when not present. | ||
- `u_host`: The full host part of the URL, including the port if present (separated by a colon.) | ||
- `u_hostname`: The name of the host, and may be the empty string in some cases. | ||
- `u_port`: The port. May be empty if irrelevant or not specified. | ||
- `u_path`: The path, typically used with HTTP or WebSockets. Will be empty string if not specified. | ||
- `u_query`: The query info (typically following `?` in the URL.) Will be `NULL` if not present. | ||
- `u_fragment`: This is used for specifying an anchor, the part after `#` in a URL. Will be `NULL` if not present. | ||
- `u_requri`: The full Request-URI. Will be the empty string if not specified. | ||
> [!NOTE] | ||
> Other fields may also be present, but only those documented here are safe for application use. | ||
> [!TIP] | ||
> More information about Universal Resource Locators can be found in | ||
> [RFC 3986](https://tools.ietf.org/html/rfc3986). | ||
## RETURN VALUES | ||
The `nng_url_parse` and `nng_url_clone` functions return zero on success, or a non-zero | ||
error value. | ||
## ERRORS | ||
- `NNG_ENOMEM`: Insufficient free memory exists. | ||
- `NNG_EINVAL`: The supplied string does not represent a valid URL. |