QueryInfo

$request->QueryInfo(header, [flags])

Queries information about an HTTP request object ($request) created with OpenRequest. You can specify a header (for example, "Content-type") and/or one or more flags. If you don't specify flags, HTTP_QUERY_CUSTOM will be used by default; this means that the header should contain a valid HTTP header name. For the possible values of flags, refer to the Microsoft Win32 Internet Functions documentation.