keep alive after upstream restart - SERP Analysis

https://serverfault.com/questions/1098985/risks-of-enabling-nginx-upstream-keepalive

http://nginx.org/en/docs/http/ngx_http_upstream_module.html

https://github.com/caddyserver/caddy/issues/6452

https://stackoverflow.com/questions/49799046/dont-let-nginx-reset-established-connection-if-upstream-down

https://medium.com/%40xemoro/reverse-proxy-with-keepalive-and-re-resolve-dns-according-to-ttl-in-nginx-047dc556273b

https://www.reddit.com/r/nginx/comments/1h6dqu1/http_keepalive_on_upstream_servers_in_nginx/

https://www.f5.com/company/blog/nginx/avoiding-top-10-nginx-configuration-mistakes

https://stackoverflow.com/questions/10395807/nginx-close-upstream-connection-after-request

https://discuss.istio.io/t/how-to-handle-downstream-keep-alive-connections-not-closed-when-upstream-closes/15380

https://nginx-devel.nginx.narkive.com/X2V5uk6A/module-add-http-upstream-keep-alive-timeout-parameter

https://superuser.com/questions/1441276/nginx-keepalive-behavior-with-upstream

https://theantway.com/2017/11/analyze-connection-reset-error-in-nginx-upstream-with-keep-alive-enabled/

https://www.f5.com/company/blog/nginx/http-keepalives-and-web-performance

https://www.haproxy.com/blog/http-keep-alive-pipelining-multiplexing-and-connection-pooling

https://blog.wtcx.dev/posts/2023/09/23/troubleshooting-connection-reset-incident/

https://mailman.nginx.org/pipermail/nginx-devel/2017-November/010618.html

https://groups.google.com/g/openresty-en/c/qmdgOTGbqtg

https://discuss.konghq.com/t/104-connection-reset-by-peer-while-reading-response-header-from-upstream/249

https://medium.com/%40in.live.in/puzzling-503s-and-istio-1bf504b9aae6

https://www.ruby-forum.com/t/trying-to-understand-upstream-keepalive/240966

https://discuss.qovery.com/t/nginx-ingress-random-error-recv-failed-104-connection-reset-by-peer/2590

https://www.netdata.cloud/academy/how-to-diagnose-and-fix-504-gateway-timeout-errors-in-nginx/

https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/core/v3/protocol.proto

https://jfrog.com/community/devops/how-to-resolve-server-timeouts/

https://betterstack.com/community/questions/nginx-reverse-proxy-causing-504/

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/

https://www.uvicorn.org/server-behavior/

https://docs.nginx.com/nginx/admin-guide/basic-functionality/runtime-control/

https://api7.ai/blog/how-nginx-reload-work

https://www.envoyproxy.io/docs/envoy/latest/intro/life_of_a_request

https://signoz.io/guides/upstream-connect-error-or-disconnect-reset-before-headers-reset-reason-connection-failure-spring-boot-and-java-11/

https://talk.plesk.com/threads/upstream-timed-out-110-connection-timed-out-while-connecting-to-upstream.371563/

https://learn.netdata.cloud/docs/netdata-agent/configuration/securing-agents/running-the-agent-behind-a-reverse-proxy/nginx

https://loadforge.com/guides/setting-up-your-nginx-configuration-for-load-balancing

https://caddy.community/t/tcp-keepalives-from-client-to-caddy-not-to-upstream/16466

https://kasmweb.com/docs/latest/guide/troubleshooting/reverse_proxies.html

https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/linux-nginx?view=aspnetcore-9.0

https://community.atlassian.com/forums/Confluence-questions/upstream-connect-error-or-disconnect-reset-before-headers-reset/qaq-p/2635529

https://community.ebay.com/t5/Report-eBay-Technical-Issues/upstream-connect-error-or-disconnect-reset-before-headers-reset/td-p/32928440/page/2

https://www.redswitches.com/blog/nginx-502-bad-gateway-error/

https://www.telerik.com/forums/502-proxy-gateway-connection-failed

https://groups.google.com/g/envoy-users/c/Vh_b4V2Z--g

https://httpd.apache.org/docs/2.4/mod/mod_proxy.html

https://docs.nginx.com/nginx/admin-guide/load-balancer/http-load-balancer/

https://docs.konghq.com/gateway/latest/reference/configuration/

https://github.com/yegor-usoltsev/nginx-upstream-keepalive

https://docs.pantheon.io/guides/git/undo-commits

https://blog.ni18.in/how-to-fix-upstream-connect-error-or-disconnect-reset-before-headers-reset-overflow/

https://docs.datadoghq.com/integrations/nginx/

https://www.baeldung.com/linux/nginx-timeouts

https://www.uptimia.com/questions/how-to-solve-110-connection-timed-out-while-reading-response-header-from-upstream-nginx-error

https://superuser.com/questions/1706823/using-nginx-as-load-balancer-and-random-requests-hang-for-a-while-then-throughp

https://www.quora.com/I-cant-open-the-link-Im-accessing-and-I-keep-getting-this-error-message-upstream-connect-error-or-disconnect-reset-before-headers-What-does-it-mean-and-how-can-I-fix-it

https://discourse.haproxy.org/t/keepalive-requests-equivalent/9403

https://www.cloudpanel.io/blog/nginx-performance/

https://www.haproxy.com/documentation/haproxy-configuration-manual/latest/

https://discuss.istio.io/t/random-tcp-connection-reset/14529

https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http-504-gateway-timeout.html

https://www.cnblogs.com/lizexiong/p/15358894.html

https://community.spotify.com/t5/Desktop-Mac/Upstream-request-timeout/td-p/5854984

https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/aspnetcore/practice-troubleshoot-linux/2-2-install-nginx-configure-it-reverse-proxy

https://karlstoney.com/istio-503s-ucs-and-tcp-fun-times/

https://www.apachelounge.com/viewtopic.php?t=9146

https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/

https://djangocas.dev/blog/nginx-reverse-proxy-configuration-and-troubleshooting/

https://www.uvicorn.org/deployment/

https://www.quora.com/What-does-it-mean-when-my-computer-says-upstream-connect-error-or-disconnect-reset-before-headers-reset-reason-overflow-What-should-I-do-to-fix-this-error

https://nginxproxymanager.com/advanced-config/

https://caddy.community/t/unreliable-reverse-proxying-to-nginx-upstream-periodic-502-bad-gateway-from-caddy/10968

https://docs.cilium.io/en/stable/cmdref/cilium-agent.html

https://www.beyondlogic.org/usbnutshell/usb2.shtml

https://docs.frrouting.org/en/latest/pim.html

https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound.conf.html

https://grpc.io/docs/guides/keepalive/

https://pm2.keymetrics.io/docs/tutorials/pm2-nginx-production-setup

https://forums.docker.com/t/nginx-swarm-redeploy-timeouts/68904

https://www.youtube.com/watch?v=K7ns3hS4HvY

https://docs.brew.sh/Formula-Cookbook

https://community.ebay.com/t5/Report-eBay-Technical-Issues/Message-Problem-upstream-connect-error-or-disconnect-reset/td-p/34547241

https://forum.vestacp.com/viewtopic.php?t=11439

https://ntfy.sh/docs/config/

https://stackify.com/error-502-bad-gateway-in-nginx-what-it-is-and-how-to-fix-it/

https://www.cisco.com/c/en/us/support/docs/content-networking/keepalives/118390-technote-keepalive-00.html

https://grafana.com/tutorials/run-grafana-behind-a-proxy/

https://discourse.linuxserver.io/t/bookstack-always-getting-504-gateway-time-out-error/4815

https://documentation.meraki.com/MX/Site-to-site_VPN/Meraki_Auto_VPN_-_Configuration_and_Troubleshooting

https://docs.stoplight.io/docs/prism/beeaad4dc0227-prism-cli

https://docs.digi.com/resources/documentation/digidocs/pdfs/90001085.pdf

https://forums.xfinity.com/conversations/your-home-network/internet-keeps-going-out-modem-reboot-resolves/66a918451466ce252a85da03

https://www.postgresql.org/docs/current/warm-standby.html

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html

https://bobcares.com/blog/nginx-upstream-error/

https://www.audiocodes.com/media/13244/gateway-and-sbc-cli-reference-guide-ver-72.pdf

https://kinsta.com/blog/504-gateway-timeout/

https://blog.logrocket.com/how-to-run-node-js-server-nginx/

https://prometheus.io/docs/prometheus/latest/configuration/configuration/

https://www.baeldung.com/linux/nginx-clear-cache

https://www.nps.gov/grsa/planyourvisit/medano-creek.htm

https://www.broadcom.com/