= cowboy_req:resp_header(3)

== Name

cowboy_req:resp_header - Access the named HTTP header set for the response

== Description

[source,erlang]
----
resp_header(Name, Req)          -> resp_header(Name, Req, undefined)
resp_header(Name, Req, Default) -> binary() | Default

Name    :: binary()
Req     :: cowboy_req:req()
Default :: any()
----

Return the currently set response header value for the given HTTP header.

== Arguments

Name::

Desired response HTTP header name as a binary.

Req::

The Req object.

Default::

Default value returned when the header is missing.

== Return value

The binary value for the given HTTP header name.

== Changelog

* *2.0*: Function introduced.

== Examples

.Get the response header with the given name
[source,erlang]
----
HeaderValue = cowboy_req:resp_header(<<"x-test-header">>, Req).
----

.Get the response header with the given name and a default
[source,erlang]
----
HeaderValue = cowboy_req:resp_header(<<"x-test-header">>, Req, <<"bar">>).
----

== See also

link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:set_resp_headers(3)[cowboy_req:resp_headers(3)]
link:man:cowboy_req:set_resp_header(3)[cowboy_req:set_resp_header(3)]
