My current setup is using NGINX (1.19) as a reverse proxy that handles TLS termination and supports HTTP/2. This server connects to a backend service in the internal network trough plain HTTP.
To connect to the upstream server, NGINX only uses HTTP/1.0 or HTTP/1.1 (proxy_http_version directive) because HTTP/2 only works with secure connections.
I'm trying to understand if this setup will supose an increased overhead. As, if I undestand correctly, if the client connects to the proxy using a single TCP connection, and send requests trough N streams, the reverse proxy will have to stablish N new TCP connections to the upstream.
I've tried to run a few tests with this setup but have not found great differences.
Is it better to just enable HTTP/1.1 in the proxy instead of HTTP/2 if the backend service will just use HTTP/1.1?
