Why does a Azure Front Door Rule Set Rule has an Order instead of a Weight?

Question

When I programatically create Rules, it shows me that:

The delivery rules order values cannot have duplicates. RestError: The delivery rules order values cannot have duplicates.

Why is that? If I have to update a Rule Set this is really hard on me to find an Order number that is not duplicated (additional requests on the API). Would it be not more beneficial to use a Weight instead so that several Rules can have the same weight like when a path hat the same "depth"?

Answer 1

Hello, Welcome to MS Q&A

Azure Front Door does not allow duplicate order values for delivery rules because each rule must have a unique priority value to ensure that the rules are processed in the correct sequence. This uniqueness prevents conflicts in rule evaluation and ensures that the system can determine which rule to apply first when multiple rules are triggered.

References:

• What is a rule set in Azure Front Door? (front-door-standard-premium)
• What is a rule set in Azure Front Door? (front-door-classic)
• To avoid duplicate order values when programmatically creating rules, you can implement a mechanism to dynamically assign unique order values. Here are some strategies:

1. Incremental Order Assignment: Start with an initial order value and increment it for each new rule.
2. Check Existing Rules: Retrieve the existing rules and their order values, then assign a new order value that is not already in use.
3. Use a Hashing Mechanism: Generate a unique hash based on rule properties and use it as the order value.

By ensuring that each rule has a unique order value, you can avoid the error and ensure that your rules are processed correctly.

Please let us know if any further questions

Kindly accept answer if it helps

Thanks

Deepanshu