【Azure应用服务】AzureMobileApp(NodeJS)的服务端部署在AppServiceforWindows中出现404NotFound--Theresourceyouarelookingforhasbeenremoved,haditsnamechanged,oristemporarilyunavailable.

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