FTP proxy based on AbstractFtpProxy, enabling read-only access (i.e. only downloading) to anonymous users (uploads and usernames other than 'anonymous' or 'ftp' are disabled). Commands and return codes are strictly checked, unknown commands and responses are rejected. Every feature is accepted.

The ABOR; ACCT; AUTH; CDUP; CWD; EPRT; EPSV; FEAT; LIST; MODE; MDTM; NLST; NOOP; OPTS; PASV; PASS; PORT; PWD; QUIT; REST; RETR; SIZE; STAT; STRU; SYST; TYPE; and USER commands are permitted, the CLNT; XPWD; MACB commands are rejected.