'TCP Sequence interpretation

How to interpret this flow diagram? What happened?

It represents the communication between NGINX Proxy server on the left and NGINX App server on the right.

There does not seem to be any relevant NGINX log record on App server. The Proxy server NGINX log recorded this:

21:19:17 [error] 2276#2276: *1108 upstream prematurely closed connection while reading response header from upstream

Wireshark TCP Flow Chart

nginxnetworkingtcpwireshark


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