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= nng_http_req_set_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_req_set_header - set HTTP request header
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
int nng_http_req_set_header(nng_http_req *req, const char *key,
const char *val);
-----------
== DESCRIPTION
The `nng_http_req_set_header()` sets the HTTP header for the request
_req_ and the _key_ to the _val_. The _key_ and _val_ are copied.
Any previous header with the same _key_ is replaced.
TIP: See <<nng_http_req_add_header#,nng_http_req_add_header(3)>> to
add additional headers with the same _key_ without replacing them.
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:` is not a legal header key.
== RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
== ERRORS
`NNG_ENOMEM`:: Insufficient memory to perform the operation.
`NNG_ENOTSUP`:: No support for HTTP in the library.
== SEE ALSO
<<nng_http_req_alloc#,nng_http_req_alloc(3)>>,
<<nng_http_req_add_header#,nng_http_req_add_header(3)>>,
<<nng_http_req_del_header#,nng_http_req_del_header(3)>>,
<<nng_http_req_get_header#,nng_http_req_get_header(3)>>,
<<nng#,nng(7)>>
== COPYRIGHT
{copyright}
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