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