HTTP/1.1 400 Bad Request
Content-Type: text/plain; charset=utf-8
Connection: close

400 Bad Request
Prometheus Node Exporter:
  node_exporter_build_info:
    branch: HEAD
    goversion: go1.15.8
    revision: b597c1244d7bef49e6f3359c87a56dd7707f6719
    version: 1.1.2
  node_uname_info:
    d...

220 ProFTPD 1.3.5b Server (Debian) [::ffff:144.217.90.86]
530 Login incorrect.
214-The following commands are recognized (* =>'s unimplemented):
214-CWD     XCWD    CDUP    XCUP    SMNT*   QUIT    PORT    PASV    
214-EPRT    EPSV    ALLO*   RNFR    RNTO    DELE    MDTM    RMD     
214-XRMD    ...