Problem with streaming SSE server behind traefik

Traefik Traefik v2
1

Hi,

I'm currently working on a fastapi server with StreamingResponse that is sending server side events.

In nginx I the stream is working with following configuration

            proxy_http_version 1.1;
            proxy_set_header Connection '';
            proxy_buffering off;

however I am not sure how to replicate this on traefik, currently the full response is coming back once in the end.

2

I am running on traefik:2.8.4

3

Would also be helpful if someone could confirm whether proxy_buffering behaviour exists in general in traefik, that would eliminate a possibility. I wasn't able to find much on the subject.

4

Solution:

  • Turning off buffering middleware allowed the chunked response to come back in a streamed fashion
5

Did you have an explicit Traefik middleware enabled?

6

buffering middleware was enabled to increase max request body size, and removing it allowed the response to come back in streamed chunks