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Settings mapped between Azure Front Door (classic) and Standard/Premium tier

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Important

Azure Front Door (classic) will be retired on March 31, 2027. To avoid any service disruption, it is important that you migrate your Azure Front Door (classic) profiles to Azure Front Door Standard or Premium tier by March 2027. For more information, see Azure Front Door (classic) retirement.

When migrating from Azure Front Door (classic) to Azure Front Door Standard or Premium, some configurations are changed or relocated for a better management experience. This article explains how routing rules, cache duration, rules engine configuration, WAF policy, and custom domains are mapped in the new Azure Front Door tier.

Routing rules

Azure Front Door (classic) settings Mapping in Azure Front Door Standard and Premium
Route status - enable/disable Changes to Enable route with a checkbox. Location remains the same.
Accepted protocol Copied from Azure Front Door (classic) profile.
Frontend/domains Changes to Domains. Copied from Azure Front Door (classic) profile.
Patterns to match Copied from Azure Front Door (classic) profile.
Rules engine configuration The rules engine configuration name changes to rule set but retains its association with routes from the Azure Front Door (classic) profile.
Route type: Forwarding Backend pool changes to origin group. Forwarding protocol is copied from the Azure Front Door (classic) profile.
- If URL rewrite is disabled, the origin path in the Standard or Premium profile is blank.
- If URL rewrite is enabled, the Custom forwarding path of the Azure Front Door (classic) profile is set as the origin path.
Route type: Redirect A URL redirect rule set called URLRedirectMigratedRuleSet1 is created with a URL redirect rule.

Cache duration

In Azure Front Door (classic), the Minimum cache duration is configured in the routing rules settings, and the Use default cache duration is set in the Rules engine configuration. Azure Front Door Standard and Premium only support changing caching duration in a Rule set rule.

Azure Front Door (classic) Mapping in Azure Front Door Standard and Premium
Caching is disabled and default caching is used. Caching is set to disabled.
Caching is enabled and the default caching duration is used. Caching is set to enabled, and the origin caching behavior is honored.
Caching is enabled and minimum caching duration is set. Caching is set to enabled and the cache behavior is set to override always with the minimum cache duration from Azure Front Door (classic).
N/A Caching is set to enabled. The caching behavior is set to override if the origin is missing, and the input cache duration is used.

Route configuration override in rules engine configuration

In Azure Front Door Standard and Premium, the route configuration override in a rules engine configuration from Azure Front Door (classic) is divided into three separate actions: URL redirect, URL rewrite, and route configuration override.

Actions in rules engine configuration Mapping in Azure Front Door Standard and Premium
Route type set to Forward 1. If URL rewrite is disabled, all settings are copied to the Standard or Premium profile.
2. If URL rewrite is enabled, two rule actions are created: one for URL rewrite and one for the route configuration override. The custom forwarding path in the Azure Front Door (classic) profile is set as the destination for the URL rewrite action.
Route type set to Redirect URL redirect action settings are copied over.
Route configuration override Backend pool is mapped to an origin group. Caching settings remain the same. Query string is mapped to query string caching behavior, and dynamic compression is mapped to compression.
Use default cache duration For more information, see the cache duration section.

Next steps