const net/http.StatusHTTPVersionNotSupported

4 uses

	net/http (current package)
		server.go#L1057: 		return nil, statusError{StatusHTTPVersionNotSupported, "unsupported protocol version"}
		status.go#L71: 	StatusHTTPVersionNotSupported       = 505 // RFC 9110, 15.6.6
		status.go#L195: 	case StatusHTTPVersionNotSupported:

	google.golang.org/grpc/internal/transport
		handler_server.go#L70: 		http.Error(w, msg, http.StatusHTTPVersionNotSupported)