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:param hash_vars: which of the vars to include in our hmac signature
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True (default) - hash all vars, False - hash none of the vars,
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iterable - hash only the included vars ['key1','key2']
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:param scheme: URI scheme (True, 'http' or 'https', etc); forces absolute URL (optional)
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:param host: string to force absolute URL with host (True means http_host)
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:param port: optional port number (forces absolute URL)