Caching

How to enable and configure caching of responses received?

Overview

When caching is enabled, WAF saves responses in a directory and uses them to respond to clients without having to proxy requests for the same content every time.

Caching Settings

How to use:

1. Go to WAF > Listeners > Performance > Caching

2. Add the caching settings

3. Click on save changes.

PARAMETERS	ACCEPTED VALUES	DEFAULT
Enable Caching	Enabled/Disabled	Disabled
Re-validate Cache	Enabled/Disabled	Enabled
Enable Background Update	Enabled/Disabled	Disabled
Enable Cache Locking	Enabled/Disabled	Disabled
Cache Methods	HTTP Methods	GET, HEAD
Maximum Request Cache Size	Integer	Blank
URI Filter	Regex	Blank
Mime Type Filter	String	Blank
Use Stale Cache	Type of errors to be cached	HTTP 500 Errors
Response Codes	Response Codes	blank
Minimum Use Before Caching	Integer	3
Cache Validity	Minutes	5
Browser Cache Expiry	Days	0

Caching Settings

Description

Enable Caching

To enable caching, enable the toggle button. It stores data so that future requests for that data can be served faster.

Re-validate Cache

This toggle button allows the re-validation of expired cache items. It helps in storing the updated data.

Enable Background Update

This toggle button enables the caching mechanism to update the cache in the background and store the updated data.

Enable Cache Locking

Enable to force caching a resource item to complete before allowing new requests to the same resource item.

Cache Methods

To cache responses to requests with methods other than GET and HEAD, list them along with GET and HEAD as parameters to this field. It specifies the HTTP Methods for which caching will be enforced.

Maximum Request Cache Size

This field specifies the maximum request size allowed for the caching to store data exceeding which will not be cached.

URI Filter

This field allows to perform caching on the specific URI using one or more regex. If the field is empty then no filter perform

Mime Type Filter

This field allows to perform caching on the specific Mime type.

Use Stale Cache

This field allows to specify the use of stale cache for errors when the back-end server is unavailable.

Response Codes

This field specifies the list of HTTP status codes for which response will be cached.

Minimum Use Before Caching

To define the minimum number of times that a request with the same key must be made before the response is cached. It is specified in terms of a number of requests.

Cache Validity

To limit how long cached responses with specific status codes are considered valid. It is specified in terms of minutes.

Browser Cache Expiry

Specify the duration of the cached item after which it will be marked in the client's browser. It is specified in terms of days.