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= nng_http_res_get_header(3)
:doctype: manpage
:manmanual: nng
:mansource: nng
:manvolnum: 3
:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
{blank} + \
This document is supplied under the terms of the \
https://opensource.org/licenses/MIT[MIT License].
== 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
<<nng_http_res_alloc#,nng_http_res_alloc(3)>>,
<<nng_http_res_add_header#,nng_http_res_add_header(3)>>,
<<nng_http_res_set_header#,nng_http_res_set_header(3)>>,
<<nng#,nng(7)>>
== COPYRIGHT
{copyright}
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