Nodejs Express Router REST APIs using azure app service - node.js

Question

I have an app service in my azure account, Which is running a node application (Express, Angular and websockets). I am able to serve static contents to my users but the REST APIs are failing with 404 not found error.
Following is my code in my index.js
var os = require('os');
var fs = require("fs");
var bodyParser = require('body-parser');
var express = require('express'),
expressApp = express(),
socketio = require('socket.io'),
http = require('http'),
uuid = require('node-uuid'),
config = require('../config/config.json');
var httpServer = http.createServer(expressApp),
rooms = {},
userIds = {};
expressApp.use(express.static(__dirname + '/../public/dist/'));
expressApp.use(bodyParser.urlencoded({ extended: true }));
expressApp.use(bodyParser.json());
var router = express.Router();
expressApp.use('/api', router);
router.get('/getsomethings', function(req, res) {
res.json(something);
});
expressApp.use('/api', router);
expressApp.listen = function listen() {
httpServer.listen(config.PORT);
};
expressApp.listen();
exports.run = function(config) {
//some code
};
And following is my web.config for app.service
<configuration>
<system.webServer>
<handlers>
<!-- indicates that the app.js file is a node.js application to be handled by the iisnode module -->
<add name="iisnode" path="index.js" verb="*" modules="iisnode" />
</handlers>
<rewrite>
<rules>
<!-- Don't interfere with requests for node-inspector debugging -->
<clear />
<rule name="Redirect to https" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTPS}" pattern="off" ignoreCase="true" />
</conditions>
<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" appendQueryString="false" />
</rule>
<rule name="NodeInspector" patternSyntax="ECMAScript" stopProcessing="true">
<match url="^index.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 application entry point -->
<rule name="DynamicContent">
<conditions>
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="True" />
</conditions>
<action type="Rewrite" url="index.js" />
</rule>
</rules>
</rewrite>
<security>
<requestFiltering>
<hiddenSegments>
<add segment="node_modules" />
</hiddenSegments>
</requestFiltering>
</security>
<!-- You can control how Node is hosted within IIS using the following options -->
<!--<iisnode
node_env="%node_env%"
nodeProcessCountPerApplication="1"
maxConcurrentRequestsPerProcess="1024"
maxNamedPipeConnectionRetry="3"
namedPipeConnectionRetryDelay="2000"
maxNamedPipeConnectionPoolSize="512"
maxNamedPipePooledConnectionAge="30000"
asyncCompletionThreadCount="0"
initialRequestBufferSize="4096"
maxRequestBufferSize="65536"
watchedFiles="*.js"
uncFileChangesPollingInterval="5000"
gracefulShutdownTimeout="60000"
loggingEnabled="true"
logDirectoryNameSuffix="logs"
debuggingEnabled="true"
debuggerPortRange="5058-6058"
debuggerPathSegment="debug"
maxLogFileSizeInKB="128"
appendToExistingLog="false"
logFileFlushInterval="5000"
devErrorsEnabled="true"
flushResponse="false"
enableXFF="false"
promoteServerVars=""
/>-->
</system.webServer>
</configuration>
When I access my site Everything is working fine except that /getsomethings XHR is giving 404 error. All static contents are served fine.
Can anyone help me to figure out what is wrong?

Answer 1

You say "I am able to serve static contents to my users", because you have this in web.config.
<!-- 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>
Based on the code you provided above, please make sure your folder structure looks like:
D:\home\site
├── config
│ └── config.json
├── deployments
│ └── ...
├── locks
│ └── ...
├── Diagnostics
│ └── ...
├── public
│ └── dist
│ └── ...
└── wwwroot
├── node_modules
│ └── ...
├── index.js
├── package.json
└── web.config
Also, Please try changing the following line of code:
httpServer.listen(config.PORT);
to:
httpServer.listen(process.env.PORT || config.PORT);