Mongo DB: Message exceeds allowed max message size

¡Hi! I've just developed RoR application to work with MongoDB and works fine. I tried few http requests to the app with postman, also worked fine!

When I deployed the app using Docker, I got a MongoDB error that follows after any request:

MONGODB | Message exceeds allowed max message size. The max is 50331648. ms_notifications_1 | 2017-09-29 21:16:48 +0000: HTTP parse error, malformed request (): # Puma::HttpParserError: Invalid HTTP format, parsing fails.

I'll be very thankful If anybody have the solution for this error. Thanks!