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= nng_http_req_add_header(3)
:doctype: manpage
:manmanual: nng
:mansource: nng
:manvolnum: 3
:copyright: Copyright 2018 Staysail Systems, Inc. <info@staysail.tech> \
Copyright 2018 Capitar IT Group BV <info@capitar.com> \
This software 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_req_add_header - add HTTP request header
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
int nng_http_req_add_header(nng_http_req *req, const char *key,
const char *val);
-----------
== DESCRIPTION
The `nng_http_req_add_header()` adds an HTTP header for the request
_req_ and the _key_ to the _val_. The _key_ and _val_ are copied.
If a header with the value of _key_ already exists, then a comma
and whitespace separate are appended to it, followed by _val_.
If no such header already exists, then one is created with the value _val_.
TIP: The HTTP specification requires that duplicate headers be treated
identically to a single header with multiple comma-delimited values.
TIP: See <<nng_http_req_set_header#,nng_http_req_set_header(3)>> if
replacement of an existing header rather than appending to it is desired.
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_del_header#,nng_http_req_del_header(3)>>,
<<nng_http_req_get_header#,nng_http_req_get_header(3)>>,
<<nng_http_req_set_header#,nng_http_req_set_header(3)>>,
<<nng#,nng(7)>>
== COPYRIGHT
Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] +
Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV]
This document is supplied under the terms of the
https://opensource.org/licenses/MIT[MIT License].
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