Ensure Web App Redirects All HTTP traffic to HTTPS in Azure App Service

Description:

Azure Web Apps allows sites to run under both HTTP and HTTPS by default. Web apps can be accessed by anyone using non-secure HTTP links by default.
Non-secure HTTP requests can be restricted and all HTTP requests redirected to the secure HTTPS port. It is recommended to enforce HTTPS-only traffic.

Rationale:

Enabling HTTPS-only traffic will redirect all non-secure HTTP requests to HTTPS ports. HTTPS uses the TLS/SSL protocol to provide a secure connection which is both encrypted and authenticated. It is therefore important to support HTTPS for the security benefits.

When it is enabled, every incoming HTTP request is redirected to the HTTPS port. This means an extra level of security will be added to the HTTP requests made to the app.

From Azure Portal

1. Login to Azure Portal using https://portal.azure.com/
2. Go to 'App Services'
3. Click on each App
4. Under 'Setting' section, Click on 'TLS/SSL settings'
5. Under the 'Bindings' pane, set 'HTTPS Only' to 'On' under 'Protocol Settings' section

From Azure CLI

To set HTTPS-only traffic value for an existing app, run the following command:

az webapp update --resource-group --name --set httpsOnly=true

From PowerShell

Set-AzWebApp -ResourceGroupName -Name -HttpsOnly $true