AppServiceで作成したwebサイトがFrontDoor経由のURLで接続してた際にリダイレクトしてしまう、

Hi @土屋 大輝
To resolve the URL redirection issue between Azure App Service and Azure Front Door, you need to ensure that App Service is configured to use the correct redirect URI. By default, App Service may use its fully qualified domain name (FQDN) as the redirect URI, which can lead to unwanted redirections back to App Service instead of staying within the Front Door URL.

Set forwardProxy to Standard: This will make App Service respect the X-Forwarded-Host header set by Azure Front Door. You cannot change this setting through the Azure portal; you will need to use the Azure CLI.

Export the current settings:

   az rest --uri /subscriptions/REPLACE-ME-SUBSCRIPTIONID/resourceGroups/REPLACE-ME-RESOURCEGROUP/providers/Microsoft.Web/sites/REPLACE-ME-APPNAME/config/authsettingsV2?api-version=2020-09-01 --method get > auth.json

Update the settings in the exported JSON file: Look for the httpSettings section and ensure that forwardProxy is set to Standard.

   "httpSettings": {
     "forwardProxy": {
       "convention": "Standard"
     }
   }

Import the updated settings:

az rest --uri /subscriptions/REPLACE-ME-SUBSCRIPTIONID/resourceGroups/REPLACE-ME-RESOURCEGROUP/providers/Microsoft.Web/sites/REPLACE-ME-APPNAME/config/authsettingsV2?api-version=2020-09-01 --method put --body @auth.json

By ensuring that the forwardProxy is set correctly, you should be able to prevent the unwanted redirection from App Service back to its own URL.

References:

• Authentication and authorization in Azure App Service and Azure Functions
• FrontDoor interface
  Let me know if you have any further assistances needed.

Thank you for your prompt response.

I followed your instructions, but the issue with redirection still persists.

One thing I noticed is that when I exported the configuration as a JSON file, the "httpsSettings" header was missing.

So this time, I manually added it to the exported JSON file—was that the correct approach?

Also, even though I’ve applied the settings, are there any other possible causes I should consider?