Useful excerpt from Gopher+ specification
==========================================

Data transfer - Basic
~~~~~~~~~~~~~~~~~~~~~~

Request:
  selector [TAB] "+" [CRLF]

Successful response (static response size):
  [+] response_size [CRLF] response_body

Successful response (dot mode):
  [+] "-1" [CRLF] response_body [CRLF] . [CRLF]

Successful response (plain)
  [+] "-2" [CRLF] response_body

Error response
  [-] error_code [CRLF] error_data [CRLF] "." [CRLF]

Error codes:
  -1 - Not available
  -2 - Server busy
  -3 - Moved/Redirect (data contains new location)

Data transfer - Advanced
~~~~~~~~~~~~~~~~~~~~~~~~~

Request specific representation
  selector [TAB] "+" representation [CRLF]
  selector [TAB] "+" representation [TAB] "0" [CRLF]

Request with data sent
  selector [TAB] "+" representation [TAB] "1" [CRLF] data_block

Datablock format (same as response)
  [+] data_size [CRLF] data_body
  [+] "-1" [CRLF] data_body [CRLF] . [CRLF]
  [+] "-2" [CRLF] data_body