【Azure 应用服务】Azure Mobile App (NodeJS) 的服务端部署在App S

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"?>


<configuration>
  <system.webServer>
    
    <webSocket enabled="false" />
    <handlers>
      
      <add name="iisnode" path="app.js" verb="*" modules="iisnode"/>
    handlers>
    
       <rewrite>
      <rules>
        
        <rule name="NodeInspector" patternSyntax="ECMAScript" stopProcessing="true">
          <match url="^app.js\/debug[\/]?" />
        rule>

        
        <rule name="StaticContent">
          <action type="Rewrite" url="public{REQUEST_URI}"/>
        rule>

        
        <rule name="DynamicContent">
          <conditions>
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="True"/>
          conditions>
          <action type="Rewrite" url="app.js"/>
        rule>
      rules>
    rewrite>

    
    <security>
      <requestFiltering>
        <hiddenSegments>
          <remove segment="bin"/>
        hiddenSegments>
      requestFiltering>
    security>

    
    <httpErrors existingResponse="PassThrough" />

    
    
  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. (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. (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. (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. (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/lul

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