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When called with just an HTTP header as a parameter, this method returns the current value for the header. For example, $myobject->('content-type') would return the value for the object's Content-Type header. To define a new header value, invoke header with a hash of header=>value pairs, where the value is a scalar or reference to an array. For example, to define the Content-Type header, you would do this:

$h->header('content-type' => 'text/plain');

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