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front-door-limits.md

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title description services author ms.service ms.topic ms.date ms.author ms.custom
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frontdoor
duongau
frontdoor
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06/25/2021
duau
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Resource Limit
Azure Front Door resources per subscription 100
Front-end hosts, which includes custom domains per resource 500
Routing rules per resource 500
Back-end pools per resource 50
Back ends per back-end pool 100
Path patterns to match for a routing rule 25
URLs in a single cache purge call 100
Custom web application firewall rules per policy 100
Web application firewall policy per subscription 100
Web application firewall match conditions per custom rule 10
Web application firewall IP address ranges per match condition 600
Web application firewall string match values per match condition 10
Web application firewall string match value length 256
Web application firewall POST body parameter name length 256
Web application firewall HTTP header name length 256
Web application firewall cookie name length 256
Web application firewall exclusion limit 100
Web application firewall HTTP request body size inspected 128 KB
Web application firewall custom response body length 2 KB

Azure Front Door Standard/Premium (Preview) Service Limits

*** Maximum 500 total Standard and Premium profiles per subscription.

Resource Standard SKU Limit Premium SKU Limit
Maximum endpoint per profile 10 25
Maximum custom domain per profile 100 200
Maximum origin group per profile 100 200
Maximum secrets per profile 100 200
Maximum security policy per profile 100 200
Maximum rule set per profile 100 200
Maximum rules per rule set 100 100
Maximum origin per origin group 50 50
Maximum routes per endpoint 100 200
URLs in a single cache purge call 100 100
Custom web application firewall rules per policy 100 100
Web application firewall match conditions per custom rule 10 10
Web application firewall IP address ranges per match condition 600 600
Web application firewall string match values per match condition 10 10
Web application firewall string match value length 256 256
Web application firewall POST body parameter name length 256 256
Web application firewall HTTP header name length 256 256
Web application firewall cookie name length 256 256
Web application firewall HTTP request body size inspected 128 KB 128 KB
Web application firewall custom response body length 2 KB 2 KB

Timeout values

Client to Front Door
  • Front Door has an idle TCP connection timeout of 61 seconds.
Front Door to application back-end
  • If the response is a chunked response, a 200 is returned if or when the first chunk is received.
  • After the HTTP request is forwarded to the back end, Front Door waits for 30 seconds for the first packet from the back end. Then it returns a 503 error to the client. This value is configurable via the field sendRecvTimeoutSeconds in the API.
    • If a request is cached and it takes more than 30 seconds for the first packet from Front Door or from the backend, then a 504 error is returned to the client.
  • After the first packet is received from the back end, Front Door waits for 30 seconds in an idle timeout. Then it returns a 503 error to the client. This timeout value is not configurable.
  • Front Door to the back-end TCP session timeout is 90 seconds.

Upload and download data limit

With chunked transfer encoding (CTE) Without HTTP chunking
Download There's no limit on the download size. There's no limit on the download size.
Upload There's no limit as long as each CTE upload is less than 2 GB. The size can't be larger than 2 GB.

Other limits

  • Maximum URL size - 8,192 bytes - Specifies maximum length of the raw URL (scheme + hostname + port + path + query string of the URL)
  • Maximum Query String size - 4,096 bytes - Specifies the maximum length of the query string, in bytes.
  • Maximum HTTP response header size from health probe URL - 4,096 bytes - Specified the maximum length of all the response headers of health probes.
  • Maximum rules engine action header value character: 640 characters.
  • Maximum rules engine condition header value character: 256 characters.