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= cowboy_req:has_resp_header(3)
== Name
cowboy_req:has_resp_header - Is the given response header set?
== Description
[source,erlang]
----
has_resp_header(Name, Req :: cowboy_req:req()) -> boolean()
Name :: binary() %% lowercase; case insensitive
----
Return whether the given response header has been set.
The header name must be given as a lowercase binary string.
While header names are case insensitive, Cowboy requires them
to be given as lowercase to function properly.
== Arguments
Name::
Header name as a lowercase binary string.
Req::
The Req object.
== Return value
A boolean indicating whether the given response header has been set.
== Changelog
* *1.0*: Function introduced.
== Examples
.Check whether the content-type header has been set
[source,erlang]
----
false = cowboy_req:has_resp_header(<<"content-type">>, Req0),
Req = cowboy_req:set_resp_header(<<"content-type">>, <<"text/html">>, Req0),
true = cowboy_req:has_resp_header(<<"content-type">>, Req).
----
== See also
link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:set_resp_header(3)[cowboy_req:set_resp_header(3)],
link:man:cowboy_req:delete_resp_header(3)[cowboy_req:delete_resp_header(3)]
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