Deploying a Vite-based React application that uses React Router to Azure App

Deploying a Vite-based React application that uses React Router to Azure App Service involves several steps. Here’s a detailed guide to help you through the process:

1. Prepare Your Application

First, ensure your React application is ready for deployment:

**Install Dependencies**: Make sure all necessary dependencies are installed in your project. If you haven’t already, initialize your project with Vite:
```
npm create vite@latest my-react-app -- --template react

cd my-react-app

npm install

\`\`\`
```
**Set Up React Router**: If React Router isn't set up yet, install it and configure your routes:
```
npm install react-router-dom

\`\`\`
```
**Configure Base Path**: Vite requires you to specify the base path if your app is served from a subdirectory. Update the `vite.config.js` file:
```
export default defineConfig({

  base: '/production-sub-path/',

  plugins: [react()]

});

\`\`\`
```

2. Build Your Application

Build your React application using Vite. This process bundles your app into static files for production.


npm run build

3. Prepare for Azure Deployment

**Create a `web.config` File**: Azure App Service uses IIS, so you need to configure it to correctly handle the client-side routing set up by React Router.

Create a `web.config` file in your project's root directory with the following content:


<?xml version="1.0"?>

<configuration>

  <system.webServer>

    <rewrite>

      <rules>

        <rule name="React Routes" stopProcessing="true">

          <match url=".*" />

          <conditions logicalGrouping="MatchAll">

            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />

            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />

          </conditions>

          <action type="Rewrite" url="/" />

        </rule>

      </rules>

    </rewrite>

  </system.webServer>

</configuration>

\`\`\`

4. Deploy to Azure App Service

**Create an Azure App Service**: Go to the Azure Portal, create a new App Service, and configure it according to your preferences.
**Set up Deployment**: You can deploy your application to Azure App Service using FTP, local Git, GitHub, or Azure DevOps. Choose the one that best fits your workflow.

**Example: Deploy using Azure CLI**
- Install Azure CLI if you haven't already.
- Log in to your Azure account:
```
az login

\`\`\`
```
- Deploy your app:
```
az webapp up --name <your-app-name> --resource-group <your-resource-group> --location <region> --html

\`\`\`
```

5. Verify Deployment

After deployment, access your Azure App Service URL to see if the application is running correctly. Make sure that client-side routing works as expected and that all routes are accessible.

6. Troubleshooting

If you encounter issues:

Check the Azure App Service logs for any errors.
Ensure the `web.config` file is correctly set up to handle React Router.
Verify that all environment variables and settings in Azure match those required by your application.

By following these steps, your Vite-based React app with React Router should be successfully deployed and running on Azure App Service.