= nng_http_server_add_handler(3http)
//
// 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_http_server_add_handler - add HTTP server handler

== SYNOPSIS

[source, c]
----
#include <nng/nng.h>
#include <nng/supplemental/http/http.h>

int nng_http_server_add_handler(nng_http_server *s, nng_http_handler *h);
----

== DESCRIPTION

The `nng_http_server_add_handler()` adds the handler _h_ to the server
instance _s_.

If another handler is already added to the server that would conflict
with handler _h_, then the operation will fail with `NNG_EADDRINUSE`.

If a handler is added to a server, and the server is subsequently
deallocated, the handler and any of its resources will also be deallocated.

Handlers that are added to a server may be subsequently removed using the
xref:nng_http_server_del_handler.3http.adoc[`nng_http_server_del_handler()`] function.

== RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

== ERRORS

[horizontal]
`NNG_EADDRINUSE`:: Handler conflicts with another handler.
`NNG_ENOMEM`:: Insufficient free memory exists.
`NNG_ENOTSUP`:: HTTP not supported.

== SEE ALSO


[.text-left]
xref:nng_http_handler_alloc.3http.adoc[nng_http_handler_alloc(3http)],
xref:nng_http_server_del_handler.3http.adoc[nng_http_server_del_handler(3http)],
xref:nng_http_server_hold.3http.adoc[nng_http_server_hold(3http)],
xref:nng_strerror.3.adoc[nng_strerror(3)],
xref:nng.7.adoc[nng(7)]