linnaea opened a new issue #7525: URL: https://github.com/apache/trafficserver/issues/7525
https://github.com/apache/trafficserver/blob/926dd71b32ade8615fbba6737816240d6df0c9ad/proxy/http/HttpTransact.cc#L6541 By the very definition of transparent proxying, this will detect a loop when it's trying to connect to origin server. Diag traces captured: ``` Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:3239 (HandleCacheOpenReadMiss)> (http_seq) [633] [HttpTransact::HandleCacheOpenReadMiss] Miss in cache Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:5182 (get_ka_info_from_config)> (http_trans) [633] get_ka_info_from_config, server_info->http_version 65537, check_hostdb 0 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:7821 (build_request)> (http_trans) [633] [build_request] removing host name from url Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:7834 (build_request)> (http_trans) [633] [build_request] request like cacheable and conditional headers removed Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:7863 (build_request)> (http_trans) [633] [build_request] request_sent_time: 1613411433 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: +++++++++ Proxy's Request +++++++++ Feb 16 01:50:33 vpn-hub traffic_manager[1043]: -- State Machine Id: 633 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: GET / HTTP/1.1 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Host: lab.linnaea.local Feb 16 01:50:33 vpn-hub traffic_manager[1043]: User-Agent: curl/7.66.0 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Accept: */* Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Via: http/1.1 traffic_server[745d2a80-67e3-4654-8bdd-49ee740d488c] (ApacheTrafficServer/9.0.0) Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:7319 (call_transact_and_set_next_state)> (http) [633] State Transition: SM_ACTION_CACHE_LOOKUP -> SM_ACTION_CACHE_ISSUE_WRITE Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:4715 (do_cache_prepare_action)> (http_cache_write) [633] writing to cache with URL http://lab.linnaea.local/ Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpCacheSM.cc:160 (state_cache_open_write)> (http_cache) [633] [&HttpCacheSM::state_cache_open_write, CACHE_EVENT_OPEN_WRITE/TS_EVENT_CACHE_OPEN_WRITE] Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:2611 (main_handler)> (http) [633] [HttpSM::main_handler, CACHE_EVENT_OPEN_WRITE/TS_EVENT_CACHE_OPEN_WRITE] Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:2423 (state_cache_open_write)> (http) [633] [&HttpSM : state_cache_open_write, CACHE_EVENT_OPEN_WRITE/TS_EVENT_CACHE_OPEN_WRITE] Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:3207 (handle_cache_write_lock)> (http_trans) Next action next; nullptr Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:7319 (call_transact_and_set_next_state)> (http) [633] State Transition: SM_ACTION_CACHE_ISSUE_WRITE -> SM_ACTION_ORIGIN_SERVER_OPEN Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:4820 (do_http_server_open)> (http_track) entered inside do_http_server_open ][ipv4] Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:4852 (do_http_server_open)> (http) [633] open connection to lab.linnaea.local: 10.141.0.2:80 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpSM.cc:4864 (do_http_server_open)> (http_seq) [HttpSM::do_http_server_open] Sending request to server Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:6667 (will_this_request_self_loop)> (http_transact) [633] host ip and port same as local ip and port - bailing Feb 16 01:50:33 vpn-hub traffic_manager[1043]: +++++++++ Proxy's Response 2 +++++++++ Feb 16 01:50:33 vpn-hub traffic_manager[1043]: -- State Machine Id: 633 Feb 16 01:50:33 vpn-hub traffic_manager[1043]: HTTP/1.1 400 Cycle Detected Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Date: Mon, 15 Feb 2021 17:50:33 GMT Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Connection: close Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Via: http/1.1 traffic_server (ATS [uEcMs f p eH:t cCMp s ] [http/1.1]) Feb 16 01:50:33 vpn-hub traffic_manager[1043]: Feb 16 01:50:33 vpn-hub traffic_manager[1043]: [Feb 16 01:50:33.718] [ET_NET 3] DEBUG: <HttpTransact.cc:801 (SelfLoop)> (http_trans) [633] [Loop]Request will selfloop. ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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