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= nng_http_res_set_data(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_set_data - set HTTP response body
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
#include <nng/supplemental/http/http.h>
int nng_http_res_set_data(nng_http_res *res, const void *body, size_t size);
-----------
== DESCRIPTION
The `nng_http_res_set_data()` sets the HTTP body associated with
the response _res_ to _body_, and the size of the body to _size_.
This body data will be automatically sent with the response when it
is sent using <<nng_http_conn_write_res#,nni_http_conn_write_res(3)>>.
This also updates the relevant `Content-Length` header of _res_.
NOTE: The current framework does not support sending data via chunked
transfer-encoding.
The _body_ is *not* copied, and the caller must ensure that it is available
until the _res_ is deallocated.
TIP: To have a local copy allocated with _res_ that will be automatically
deallocated when _res_ is freed,
see <<nng_http_res_copy_data#,nng_http_res_copy_data(3)>>.
TIP: It is a good idea to also set the `Content-Type` header.
== 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_conn_write_res#,nng_http_conn_write_res(3)>>,
<<nng_http_res_alloc#,nng_http_res_alloc(3)>>,
<<nng_http_res_copy_data#,nng_http_res_copy_data(3)>>,
<<nng_http_res_set_header#,nng_http_res_set_header(3)>>,
<<nng#,nng(7)>>
== COPYRIGHT
{copyright}
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