The gopher URL specifies the host and optionally the port to which the client should connect. This is followed by a slash and a single gopher type code. This type code is used by the client to determine how to interpret the server's reply and is is not for sending to server. The command string to be sent to the server immediately follows the gopher type character. It consists of the gopher selector string followed by any "Gopher plus" syntax, but always omitting the trainling CR LF pair.
When the gopher command string contains characters (such a embedded CR LF and HT characters) not allowed in a URL, these are encoded using the conventional encoding.
Note that some gopher selector strings begin with a copy of the gopher type character, in which case that character will occur twice consecutively. Also note that the gopher selector string may be an empty string since this is how gopher clients refer to the top-level directory on a gopher server.
If the encoded command string (with trailing CR LF stripped) would be void then the gopher type character may be omiited and "1" (ASCII 31 hex) is assumed.
Note that slash "/" in gopher selector strings may not correspond to a level in a hierarchical structure.