Improve serve mux path

pkg/srv/http/http.go

@@ -59,17 +59,30 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 	// Inject extra handlers if given
 	// Used for grpc-gateway runtime.ServeMux handlers
 	for _, h := range opts.Handlers {
+		var servePath string
+
+		if h.Pattern != "" && h.Prefix != "" {
+			l.Fatal().Str("ExactPath", h.Pattern).Str("Prefix", h.Prefix).
+				Msg("Can't have both pattern and prefix match for http handler")
+		}
+
+		if h.Prefix != "" {
 			// prefix must end in / to route sub-paths
 			if !strings.HasSuffix(h.Prefix, "/") {
 				h.Prefix = h.Prefix + "/"
 			}
+			servePath = h.Prefix
 
 			// if enabled, the path prefix is stripped before
 			// requests are sent to the handler
 			if h.StripPrefix {
 				h.Handler = http.StripPrefix(h.Prefix[:len(h.Prefix)-1], h.Handler)
 			}
-		mux.Handle(h.Prefix, otelhttp.WithRouteTag(h.Prefix, h.Handler))
+		} else {
+			servePath = h.Pattern
+		}
+
+		mux.Handle(h.Prefix, otelhttp.WithRouteTag(servePath, h.Handler))
 	}
 
 	// Add OTEL instrumentation, filter noise, set span names

pkg/srv/http/opts/http_config.go

@@ -22,7 +22,8 @@ type HTTPFunc struct {
 }
 
 type HTTPHandler struct {
-	Prefix      string // path prefix under which to serve this handler/mux
+	Prefix      string // path prefix under which to serve this handler/mux, used for convenience
+	Pattern     string // pattern match
 	StripPrefix bool   // strip path before sending to handler/mux
 	Handler     http.Handler
 }