= nng_http_server_add_handler(3http)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_http_server_add_handler - add HTTP server handler
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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#include <nng/supplemental/http/http.h>
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int nng_http_server_add_handler(nng_http_server *s, nng_http_handler *h);
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----
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== DESCRIPTION
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The `nng_http_server_add_handler()` adds the handler _h_ to the server
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instance _s_.
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If another handler is already added to the server that would conflict
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with handler _h_, then the operation will fail with `NNG_EADDRINUSE`.
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If a handler is added to a server, and the server is subsequently
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deallocated, the handler and any of its resources will also be deallocated.
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Handlers that are added to a server may be subsequently removed using the
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xref:nng_http_server_del_handler.3http.adoc[`nng_http_server_del_handler()`] function.
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== RETURN VALUES
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This function returns 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_EADDRINUSE`:: Handler conflicts with another handler.
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`NNG_ENOMEM`:: Insufficient free memory exists.
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`NNG_ENOTSUP`:: HTTP not supported.
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== SEE ALSO
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[.text-left]
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xref:nng_http_handler_alloc.3http.adoc[nng_http_handler_alloc(3http)],
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xref:nng_http_server_del_handler.3http.adoc[nng_http_server_del_handler(3http)],
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xref:nng_http_server_hold.3http.adoc[nng_http_server_hold(3http)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng.7.adoc[nng(7)]
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