Refactor reverse proxy path handling and enhance documentation. Updated reverse.go to improve upstream URL construction and added a new test for nested API routes in reverse_test.go. Revised GATEWAY_RUN.md to clarify API path behavior and configuration requirements for Nginx. Adjusted comments in config.example.yaml for better understanding of HTTPS and API prefix usage.

internal/proxy/reverse_test.go

@@ -45,3 +45,24 @@ func TestReverseProxyPathRewriteWithAPIBasePath(t *testing.T) {
 		t.Fatalf("status %d", rec.Code)
 	}
 }
+
+func TestReverseProxyPathNestedStatsUsers(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/stats/users" {
+			t.Fatalf("path %q", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+	up, err := url.Parse(srv.URL + "/api/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	rp := NewReverseProxy(up, "/api/gt2", "/v1", "")
+	req := httptest.NewRequest(http.MethodGet, "/api/gt2/stats/users", nil)
+	rec := httptest.NewRecorder()
+	rp.ServeHTTP(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status %d", rec.Code)
+	}
+}