Add man pages for the reply functions

1 files changed, 54 insertions, 0 deletions

diff --git a/doc/src/manual/cowboy_req.has_resp_header.asciidoc b/doc/src/manual/cowboy_req.has_resp_header.asciidoc
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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)]