anchor.diff:  code_to_phrase(305) -> "Use Proxy";
   code_to_phrase(306) -> "(Unused)";
   code_to_phrase(307) -> "Temporary Redirect";
  +code_to_phrase(308) -> "Permanent Redirect";
   code_to_phrase(400) -> "Bad Request";
   code_to_phrase(401) -> "Unauthorized";
   code_to_phrase(402) -> "Payment Required";
  
positive.code: code_to_phrase(503) -> "Service Unavailable";
  code_to_phrase(504) -> "Gateway Timeout";
  code_to_phrase(505) -> "HTTP Version Not Supported";
  code_to_phrase(511) -> "Network Authentication Required";
  
  %% Below are some non-HTTP status codes from other protocol standards that
  
negative.code: 
  code_to_phrase(100) -> "Continue";
  code_to_phrase(101) -> "Switching Protocols ";
  code_to_phrase(102) -> "Processing";
  code_to_phrase(200) -> "OK";
  code_to_phrase(201) -> "Created";
  code_to_phrase(202) -> "Accepted";
  