大佬教程收集整理的这篇文章主要介绍了调试 NodeJS 中的 404 和 502 错误，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我有一台运行 NodeJs 的服务器。我有两个类似的错误，我不明白。第一个显示 502：
[2021-03-26T11:30:09.714Z] (node:16944) UnhandledPromiseRejectionWarning: Error: request Failed with status code 502
at createError (/path/to/root/server/node_modules/axios/lib/core/createError.Js:16:15)
at settle (/path/to/root/server/node_modules/axios/lib/core/settle.Js:17:12)
at Incomingmessage.handleStreamEnd (/path/to/root/server/node_modules/axios/lib/adapters/http.Js:260:11)
at Incomingmessage.emit (events.Js:323:22)
at Incomingmessage.EventEmitter.emit (domain.Js:482:12)
at endReadableNT (_stream_readable.Js:1204:12)
at processticksAndRejections (internal/process/task_queues.Js:84:21)
[2021-03-26T11:30:09.714Z] (node:16944) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing insIDe of an async function without a catch block,or by rejecTing a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection,use the Cli flag `--unhandled-rejections=Strict` (see https://nodeJs.org/API/cli.HTML#cli_unhandled_rejections_modE). (rejection ID: 2)
[2021-03-26T11:30:09.714Z] (node:16944) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future,promise rejections that are not handled will terminate the Node.Js process with a non-zero exit code.
它发生在白天的某个使用时间，但带有 URL 和用户代理的标准输出日志没有将请求显示为发生错误时的明显罪魁祸首：
[2021-03-26T11:29:27.753Z] /r?u=https://vimeo.com/emotionathletes :: Mozilla/5.0 (compatible; barkrowler/0.9; +https://babbar.tech/crawler)
[0mGET /r?u=https://vimeo.com/emotionathletes [36m302[0m 0.653 ms - 110[0m
[0mGET /health [32m200[0m 1.397 ms - 2[0m
[2021-03-26T11:30:00.688Z] / :: Mozilla/5.0 (windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/72.0.3626.109 Safari/537.36
[2021-03-26T11:30:42.524Z] /gift/3 :: Mozilla/5.0 (windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/89.0.4389.90 Safari/537.36
第二个错误显示 404：
[2021-04-11T00:05:42.097Z] (node:30418) UnhandledPromiseRejectionWarning: Error: request Failed with status code 404
at createError (/path/to/root/server/node_modules/axios/lib/core/createError.Js:16:15)
at settle (/path/to/root/server/node_modules/axios/lib/core/settle.Js:17:12)
at Incomingmessage.handleStreamEnd (/path/to/root/server/node_modules/axios/lib/adapters/http.Js:260:11)
at Incomingmessage.emit (events.Js:323:22)
at Incomingmessage.EventEmitter.emit (domain.Js:482:12)
at endReadableNT (_stream_readable.Js:1204:12)
at processticksAndRejections (internal/process/task_queues.Js:84:21)
[2021-04-11T00:05:42.097Z] (node:30418) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing insIDe of an async function without a catch block,use the Cli flag `--unhandled-rejections=Strict` (see https://nodeJs.org/API/cli.HTML#cli_unhandled_rejections_modE). (rejection ID: 2)
[2021-04-11T00:05:42.097Z] (node:30418) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future,promise rejections that are not handled will terminate the Node.Js process with a non-zero exit code.
它发生在晚上，几乎没有网站使用。该请求似乎来自用户代理中带有 root@ 的黑客：
[2021-04-11T00:05:41.972Z] / :: Mozilla/5.0 (X11; linux x86_64; rv:73.0) Gecko/20100101 firefox/73.0 root@user-agent.ipmap.io
[0mGET / [0m-[0m - ms - -[0m
我将服务器请求记录到 stdout：
let ua = req.get('User-Agent');
console.log(req.originalUrl," :: ",ua);
我怎样才能了解错误的原因并修复它？
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