HH-45307 fix calling template_postprocessor after HTTPError
HH-45307 add send_error implementation for backwards compatibility
Merge remote-tracking branch 'origin/HH-45307' into EXP-11937
release 2.20.19 [an.sumin@hh.ru]
HH-45231 move ApplicationGlobals back to handler
HH-45231 remove port argument usages in tests
HH-45231 introduce http_client module
HH-45231 add explicit parse_on_error and parse_response options
HH-45231 move all http-client methods to http_client module
HH-45231 add more http client tests
HH-45231 update docs