Javascript ng服务工作者不缓存数据

ng service worker仅在缓存控制响应标头中指定的时间内缓存数据：public，max age=60，s-maxage=60。脱机模式下60秒后，响应504网关超时（来自ServiceWorker）到达请求

  {
      "$schema": "./node_modules/@angular/service-worker/config/schema.json",
      "index": "/index.html",
      "assetGroups": [
        {
          "name": "app",
          "installMode": "prefetch",
          "resources": {
            "files": [
              "/favicon.ico",
              "/index.html",
              "/manifest.webmanifest",
              "/*.css",
              "/*.js"
            ]
          }
        },
         {
          "name": "assets",
          "installMode": "lazy",
          "updateMode": "prefetch",
          "resources": {
            "files": [
              "/assets/**",
              "/app/app.component.ts",
              "/*.(pdf|odt|eot|svg|cur|jpg|png|webp|gif|otf|ttf|woff|woff2|ani)"
            ]
          }
        }
      ],
      "dataGroups": [
      {
              "name": "github-api",
          "urls": ["**//api.github.com/**"],
          "cacheConfig": {
            "strategy": "performance",
            "maxSize": "100",
            "maxAge": "7d"

        }
      }
    ]
    }

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可能有什么问题？

您是如何配置服务人员的？运行哪个命令将service worker安装到angular应用程序？使用以下命令：ng add@angular/pwa--项目名称