NGINX Error: upstream sent invalid chunked response while reading upstream

Question

We have tomcat with Jersey serving APIs behind NGINX. A new streaming API we have developed worked great when we call Tomcat directly, but started getting no response when calling it through NGINX.

Looking at NGINX logs we got:

upstream sent invalid chunked response while reading upstream

Answer 1

We have solved the issue by adding the following to NGINX:

proxy_http_version 1.1

I guess NGINX proxies traffic by default with http version 1.0, but chunked transfer encoding is a http 1.1 feature.

https://forum.nginx.org/read.php?2,247883,247906#msg-247906

Answer 2

In my case, only setting proxy_http_version 1.1 did not work. I had to set these -

proxy_http_version 1.1;
proxy_set_header Connection "";