'Duplicated content-type in Google Cloud application

I'm encontering a problem that I have never seen. My application is in production since 2021, but it is a few days that I'm having an issue:

  • The content type that the client is receiving is Content-Type: 'application/json,application/json'.

The application is composed by a python Google Cloud Functions called from a NGINX proxy server.

Application code in Google Cloud Functions seems ok and should never return multiple content-type.



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