New: ServiceBase migrated from shortener

server/server.go

@@ -0,0 +1,27 @@
+package server
+
+import (
+	"log/slog"
+	"net/http"
+
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+)
+
+// ListenAndServeH2C starts an HTTP server with HTTP/1.1 and unencrypted HTTP/2 support (h2c),
+// wrapped with OpenTelemetry HTTP handler for tracing and metrics.
+func ListenAndServeH2C(addr string, handler http.Handler, telemetryName string) error {
+	instrumentedHandler := otelhttp.NewHandler(handler, telemetryName)
+
+	p := new(http.Protocols)
+	p.SetHTTP1(true)
+	// Use h2c so we can serve HTTP/2 without TLS.
+	p.SetUnencryptedHTTP2(true)
+	s := http.Server{
+		Addr:      addr,
+		Handler:   instrumentedHandler,
+		Protocols: p,
+	}
+
+	slog.Info("Starting server on " + addr)
+	return s.ListenAndServe()
+}