scheme = ( alpha | digit | "+" | "-" | "." )* ;
  absolute_uri = (scheme ":" (uchar | reserved )*);

  path = (pchar+ ( "/" (pchar*) )* ) ;
  query = ( uchar | reserved )* ;
  param = ( pchar | "/" )* ;
  params = (param ( ";" param )*) ;
  rel_path = (path? (";" params)?)  ("?" query)? ;
  absolute_path = ("/"+ rel_path);

  Request_URI = ("*" | absolute_uri | absolute_path) ;