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= nng_http_res_get_header(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_res_get_header - return HTTP response header
== SYNOPSIS
[source, c]
----
#include <nng/nng.h>
#include <nng/supplemental/http/http.h>
const char *nng_http_res_get_header(nng_http_res *res, const char *key);
----
== DESCRIPTION
The `nng_http_res_get_header()` looks for an HTTP header _key_ in
the response _res_, and returns the associated value if found,
or `NULL` if not found.
The value of _key_ is case insensitive, and should not include the final
colon in an HTTP header.
For example, specifying `Host` or `hOSt` are
equivalent, whereas the value `Host:` will not find anything.
== RETURN VALUES
HTTP header value for _key_, if it exists, or NULL otherwise.
== ERRORS
None.
== SEE ALSO
[.text-left]
<<nng_http_res_alloc.3http#,nng_http_res_alloc(3http)>>,
<<nng_http_res_add_header.3http#,nng_http_res_add_header(3http)>>,
<<nng_http_res_set_header.3http#,nng_http_res_set_header(3http)>>,
<<nng.7#,nng(7)>>
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