Reference manual for squid's configuraiton directives
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Configures an ordered set of similar, redundant services. This is
useful when hot standby or backup adaptation servers are available.
adaptation_service_set set_name service_name1 service_name2 ...
applicable adaptation service from the set is used first. The next
applicable service is tried if and only if the transaction with the
previous service fails and the message waiting to be adapted is still
intact.
When adaptation starts, broken services are ignored as if they were
not a part of the set. A broken service is a down optional service.
The services in a set must be attached to the same vectoring point
(e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
If all services in a set are optional then adaptation failures are
bypassable. If all services in the set are essential, then a
transaction failure with one service may still be retried using
another service from the set, but when all services fail, the master
transaction fails as well.
A set may contain a mix of optional and essential services, but that
is likely to lead to surprising results because broken services become
ignored (see above), making previously bypassable failures fatal.
Technically, it is the bypassability of the last failed service that
matters.
See also: adaptation_access adaptation_service_chain
Example: adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup adaptation service_set svcLogger loggerLocal loggerRemote
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