+* PARSE_QUERY
+ Parse URL querystring (same as http\Params::PARSE_URLENCODED|http\Params::PARSE_DIMENSION).
+* PARSE_RFC5987
+ Parse [RFC5987](http://tools.ietf.org/html/rfc5987) style encoded character set and language information embedded in HTTP header params.
+* PARSE_RFC5988
+ Parse [RFC5988](http://tools.ietf.org/html/rfc5988) (Web Linking) tags of Link headers.