I can't reproduce your issue on Azure App Service with Express. However, the following is what I tried so far.
My folder structure:

My app.js code looks like:
var express = require('express') var app = express() app.use(express.static('public')) app.get('/', function (req, res) { res.send('Hello Azure!') }) app.get('/search', function(req, res) { res.send(200, 'Test') }) app.listen(process.env.PORT || 3000, function () { console.log('Example app listening on port 3000!') })
My test.html code:
<html> <head> <title>Test</title> </head> <body> <form action="search" method="GET"> <input type="text" name="q" /> <button type="submit">Search</button> </form> </body> </html>
web.config:
<?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 app.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 To debug your node.js application: * set the debuggingEnabled option to "true" * enable web sockets from the portal at https://manage.windowsazure.com/#Workspaces/WebsiteExtension/Website/aaronexpress/configure * browse to https://aaronexpress.azurewebsites.net/app.js/debug/ See https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config for a full list of options --> <iisnode watchedFiles="web.config;*.js" debuggingEnabled="false" /> </system.webServer> </configuration>
Tested result:

And could you share the web.config file which you are using? My guess is you're missing out on a simple thing there.