Mongodb Connection Dropped could not reconnect

[weiztech]

2017/02/26 13:26:01 [error] 14472#0: *11 Mongo connection dropped, could not reconnect, client: 127.0.0.1, server: localhost, request: "GET /gridfs/label2.jpeg HTTP/1.1", host: "localhost"
2017/02/26 13:26:01 [alert] 14472#0: *11 header already sent while sending response to client, client: 127.0.0.1, server: localhost, request: "GET /gridfs/label2.jpeg HTTP/1.1", host: "localhost"

this is happend when try to access it from url

[dennisit]

me too

[huhu-jin]

with branch master + nginx 1.7.9 has some problem