diff --git a/server.go.tmpl b/server.go.tmpl
index 17837f1..67dc7f3 100644
--- a/server.go.tmpl
+++ b/server.go.tmpl
@@ -49,14 +49,14 @@ func (s *{{$serviceName}}) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		handler = s.serve{{$method.Name | firstLetterToUpper}}JSON{{if $method.StreamOutput}}Stream{{end}}
 	{{- end}}
 	default:
-		err := ErrWebrpcBadRoute.WithCause(fmt.Errorf("no handler for path %q", r.URL.Path))
+		err := ErrWebrpcBadRoute.WithCause(fmt.Errorf("no WebRPC method defined for path %v", r.URL.Path))
 		s.sendErrorJSON(w, r, err)
 		return
 	}
 
 	if r.Method != "POST" {
 		w.Header().Add("Allow", "POST") // RFC 9110.
-		err := ErrWebrpcBadMethod.WithCause(fmt.Errorf("unsupported method %q (only POST is allowed)", r.Method))
+		err := ErrWebrpcBadMethod.WithCause(fmt.Errorf("unsupported method %v (only POST is allowed)", r.Method))
 		s.sendErrorJSON(w, r, err)
 		return
 	}
@@ -71,7 +71,7 @@ func (s *{{$serviceName}}) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case "application/json":
 		handler(ctx, w, r)
 	default:
-		err := ErrWebrpcBadRequest.WithCause(fmt.Errorf("unexpected Content-Type: %q", r.Header.Get("Content-Type")))
+		err := ErrWebrpcBadRequest.WithCause(fmt.Errorf("unsupported Content-Type %q (only application/json is allowed)", r.Header.Get("Content-Type")))
 		s.sendErrorJSON(w, r, err)
 	}
 }