ethod adds a filter to the handler, which checks whether the request matches the provided condition or not.
Every ACL method can be accompanied by a condition block, which should return boolean value. 
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The filter defined by the method that first matched the accompanying condition gets applied (e.g. response <code>403 Forbidden</code>, redirect to somewhere).
If a condition block is omitted, all requests matches.
If none of the conditions matches the request, the handler returns <code>399</code> an