Mark Nelson 6a1ad7c677 MDL-65794 core: allow ajax calls to specify a cache key
This allows for better caching capabilities on servers. If a
cache key is passed and the web service call does not require
the user to be logged in we will attempt to use GET for the
request. This allows for things like proxy caching on URLs.
The cache key must be changed if we do not want to retrieve
what has been cached and want to perform the request again.
2019-07-16 14:23:34 +08:00
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