全文标题:【Azure 应用服务】Azure Mobile App (NodeJS) 的服务端部署在App Service for Windows中出现404 Not Found -- The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
问题描述
使用NodeJS的后端应用，开发一个Mobile App的服务端，手机端通过REST API来访问获取后端数据。在本地编译好后，通过npm start启动项目，访问效果如下:
但是，当把项目文件通过FTP，或者直接VS Code 部署到App Service for windows后，访问首页并不是mobile app的页面，而是默认的App Service页面，访问项目里面的API也是404错误？
问题解决
从访问默认URL和测试API为404的效果来看，这是NodeJS项目并没有启动。因为是App Service For Windows环境，非ASP.NET的项目都需要通过IIS启用对于的进程文件来执行代码。如NodeJS项目则会启动一个 node.exe 用于执行 js 文件。
所以第一步是进入到App Service的高级工具 (Kudu）站点中，查看以下图片中的两点：
1： node.exe 进程是否存在
2： node.exe 进程中所加载的js文件是否是正确的启动文件
如果缺少了Web.config文件，则以下面的内容来创建它：
<?xml version="1.0" encoding="utf-8"?> <!-- This configuration file is required if iisnode is used to run node processes behind IIS or IIS Express. For more information, visit: https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config --> <configuration> <system.webServer> <!-- Visit http://blogs.msdn.com/b/windowsazure/archive/2013/11/14/introduction-to-websockets-on-windows-azure-web-sites.aspx for more information on WebSocket support --> <webSocket enabled="false" /> <handlers> <!-- Indicates that the server.js file is a node.js site to be handled by the iisnode module --> <add name="iisnode" path="app.js" verb="*" modules="iisnode"/> </handlers> <rewrite> <rules> <!-- Do not interfere with requests for node-inspector debugging --> <rule name="NodeInspector" patternSyntax="ECMAScript" stopProcessing="true"> <match url="^app.js\/debug[\/]?" /> </rule> <!-- First we consider whether the incoming URL matches a physical file in the /public folder --> <rule name="StaticContent"> <action type="Rewrite" url="public{REQUEST_URI}"/> </rule> <!-- All other URLs are mapped to the node.js site entry point --> <rule name="DynamicContent"> <conditions> <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="True"/> </conditions> <action type="Rewrite" url="app.js"/> </rule> </rules> </rewrite> <!-- 'bin' directory has no special meaning in node.js and apps can be placed in it --> <security> <requestFiltering> <hiddenSegments> <remove segment="bin"/> </hiddenSegments> </requestFiltering> </security> <!-- Make sure error responses are left untouched --> <httpErrors existingResponse="PassThrough" /> <!-- You can control how Node is hosted within IIS using the following options: * watchedFiles: semi-colon separated list of files that will be watched for changes to restart the server * node_env: will be propagated to node as NODE_ENV environment variable * debuggingEnabled - controls whether the built-in debugger is enabled See https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config for a full list of options --> <!--<iisnode watchedFiles="web.config;*.js"/>--> </system.webServer> </configuration>
PS: handlers 和 rewrite 部分是必须的，其中 app.js 的名称可以根据实际项目中的启动文件而修改。
当web.config添加后，问题解决，再次访问效果为：
附录一：如果是遇见的其他错误，如 Module 缺少，则可以在 Logfiles中的 Application 文件夹中的 logging-errors.txt 中查看详细错误，如：
Mon Jan 24 2022 10:59:28 GMT+0000 (Greenwich Mean Time): Application has thrown an uncaught exception and is terminated: Error: Cannot find module 'express' Require stack: - D:\home\site\wwwroot\index.js - D:\Program Files (x86)\iisnode\interceptor.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15) at Function.Module._load (internal/modules/cjs/loader.js:667:27) at Module.require (internal/modules/cjs/loader.js:887:19) at require (internal/modules/cjs/helpers.js:74:18) at Object.<anonymous> (D:\home\site\wwwroot\index.js:1:17) at Module._compile (internal/modules/cjs/loader.js:999:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10) at Module.load (internal/modules/cjs/loader.js:863:32) at Function.Module._load (internal/modules/cjs/loader.js:708:14) at Module.require (internal/modules/cjs/loader.js:887:19) Mon Jan 24 2022 11:09:37 GMT+0000 (Greenwich Mean Time): Application has thrown an uncaught exception and is terminated: Error: Cannot find module 'depd' Require stack: - D:\home\site\wwwroot\node_modules\body-parser\index.js - D:\home\site\wwwroot\node_modules\express\lib\express.js - D:\home\site\wwwroot\node_modules\express\index.js - D:\home\site\wwwroot\index.js - D:\Program Files (x86)\iisnode\interceptor.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15) at Function.Module._load (internal/modules/cjs/loader.js:667:27) at Module.require (internal/modules/cjs/loader.js:887:19) at require (internal/modules/cjs/helpers.js:74:18) at Object.<anonymous> (D:\home\site\wwwroot\node_modules\body-parser\index.js:14:17) at Module._compile (internal/modules/cjs/loader.js:999:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10) at Module.load (internal/modules/cjs/loader.js:863:32) at Function.Module._load (internal/modules/cjs/loader.js:708:14) at Module.require (internal/modules/cjs/loader.js:887:19) Mon Jan 24 2022 11:10:24 GMT+0000 (Greenwich Mean Time): Application has thrown an uncaught exception and is terminated: Error: Cannot find module 'merge-descriptors' Require stack: - D:\home\site\wwwroot\node_modules\express\lib\express.js - D:\home\site\wwwroot\node_modules\express\index.js - D:\home\site\wwwroot\index.js - D:\Program Files (x86)\iisnode\interceptor.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15) at Function.Module._load (internal/modules/cjs/loader.js:667:27) at Module.require (internal/modules/cjs/loader.js:887:19) at require (internal/modules/cjs/helpers.js:74:18) at Object.<anonymous> (D:\home\site\wwwroot\node_modules\express\lib\express.js:17:13) at Module._compile (internal/modules/cjs/loader.js:999:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10) at Module.load (internal/modules/cjs/loader.js:863:32) at Function.Module._load (internal/modules/cjs/loader.js:708:14) at Module.require (internal/modules/cjs/loader.js:887:19) Mon Jan 24 2022 11:11:35 GMT+0000 (Greenwich Mean Time): Application has thrown an uncaught exception and is terminated: Error: Cannot find module 'finalhandler' Require stack: - D:\home\site\wwwroot\node_modules\express\lib\application.js - D:\home\site\wwwroot\node_modules\express\lib\express.js - D:\home\site\wwwroot\node_modules\express\index.js - D:\home\site\wwwroot\index.js - D:\Program Files (x86)\iisnode\interceptor.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15) at Function.Module._load (internal/modules/cjs/loader.js:667:27) at Module.require (internal/modules/cjs/loader.js:887:19) at require (internal/modules/cjs/helpers.js:74:18) at Object.<anonymous> (D:\home\site\wwwroot\node_modules\express\lib\application.js:16:20) at Module._compile (internal/modules/cjs/loader.js:999:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10) at Module.load (internal/modules/cjs/loader.js:863:32) at Function.Module._load (internal/modules/cjs/loader.js:708:14) at Module.require (internal/modules/cjs/loader.js:887:19)
然后，直接从本地项目文件夹 node_modules 中的内容 上传到 App Service 中，即可解决 connot find module ‘ **** ’ 错误。
附录二：示例代码
下载地址：https://files.cnblogs.com/files/lulight/nodejs-express-azuermobileapp-web.confg.zip?t=1643031258
参考资料
Create a Node.js web app in Azure：https://docs.microsoft.com/en-us/azure/app-service/quickstart-nodejs?tabs=windows&pivots=development-environment-vscode
Node.js Hello World in App Service: https://github.com/Azure-Samples/nodejs-docs-hello-world
