HTTP/1.0 500 Internal Server Error Cache-Control: must-revalidate Connection: close Content-Length: 60 Content-Type: application/json Date: Thu, 25 May 2017 08:36:50 GMT Server: CouchDB/2.0.0 (Erlang OTP/17) X-Couch-Request-ID: 01fef48ae2 X-Couch-Stack-Hash: 3754817947 X-CouchDB-Body-Time: 0 {"error":"unknown_error","reason":"undef","ref":3754817947}