所以我在使用 vercel 的 nuxt 实现上遇到了这个问题，随机时刻该网站无法加载并抛出 502 http 错误，这是 vercel 的堆栈跟踪：
ERROR Unhandled Promise Rejection {"errorType":"Runtime.UnhandledPromiseRejection","errorMessage":"FetchError: request to {api_url} failed, reason: Client network socket disconnected before secure TLS connection was established","reason":{"errorType":"FetchError","errorMessage":"request to {api_url} failed, reason: Client network socket disconnected before secure TLS connection was established","code":"ECONNRESET","message":"request to {api_url} failed, reason: Client network socket disconnected before secure TLS connection was established","type":"system","errno":"ECONNRESET","stack":["FetchError: request to {api_url} failed, reason: Client network socket disconnected before secure TLS connection was established"," at ClientRequest.<anonymous> (server.js:16011:11)"," at ClientRequest.emit (events.js:315:20)"," at …