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: go1.12.5
    revision: 3db77732e925c08f675d7404a8c46466b2ece83e
    version: 0.18.1
  node_uname_info:
    ...