Rule Engine Configuration: Add "Request Host Name" as a test condition field
The only option currently available within Azure Front Door to test the incoming request host name is through the "Request Url" field; since regexes are not supported - and the incoming request url value can be incredibly long - it is not economical to test against this field.
Enabling developers to test conditions against a "Request Host Name" field would let them to implement high-level, domain-specific rules without any difficulty.
An example rule with "Request Host Name" "Ends With" "mx" "To Lowercase" would be applicable to these incoming requests:
But it would not be applicable to these incoming requests: