[Ur] fastCGI backend and POST /.msgs HTTP/1.1 requests

[Sergey Mironov]

Hi. I am facing a problem running the application compiled in FastCGI
mode with nginx. The error on server says

2017/04/14 01:19:13 [error] 11847#0: *2 upstream sent unexpected
FastCGI request id low byte: 0 while reading response header from
upstream, client: 127.0.0.1, server: , request: "POST /.msgs
HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"127.0.0.1:8081", referrer: "http://127.0.0.1:8081/App/convertFile/48"

On the client, there is an alert "Server: Error querying remote server
for messages: 502"

Any ideas what may go wrong there?

Regards,
Sergey