#grpc

hi

Is is possible to load balance grpc and https/web traffic on the same ip. I tried it with caddy but i get a http preface error

same ip and same port

so both on port 443?

altr: you should be able to if you are proxying. But gRPC requires HTTP/2, so that may be your problem.

mm ok. Probably did something wrong :)

Any suggestions for the proxy software?

using https://caddyserver.com/ now

I've not used caddy myself, but I have looked at it some. I thought it would be able to do HTTP/2.

nghttpx is pretty common right now, or things built on the same library, like envoy.

Caddy can do HTTP/2

Yeah, I thought Caddy should be able to do both inbound and outbound HTTP/2.

It's not clear to me that Caddy can do *outbound* HTTP/2

But it can definitely do inbound HTTP/2

Actually, it would probably only do outbound HTTP/2 if using TLS, which probably isn't the case.

altr: Is it safe to assume you're doing plaintext (no SSL/TLS) from the proxy to the backend?

yes

im using an insecure connection there

Then I'd expect the error you got was when Caddy is acting as a client to the backend.

or could it be that caddy is proxying the traffic from http2 -> http

and grpc always expects http2 right?

The grpc protocol is HTTP/1.1-safe (assuming trailer support), but the implementations only speak HTTP/2.

So yeah, grpc expects http/2.

mm maybe that is the issue. Ill do some more testing

thanks