version 2.1.0: optimize for log only scenario

version 2.0.17: fix execution time calculation

version 2.0.16: clean and flush in cache interface

version 2.0.15: fastcgi_finish_request

version 2.0.14: delete from cache, blocked status

version 2.0.13: better default Request configuration

version 2.0.12: reworked context

version 2.0.11: addContext

version 2.0.10: memcache fix

version 2.0.9: memcache prefix, siteUrl in httpClient