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net/http: make Transport's idle connection management aware of DNS changes? · Issue #23427 · golang/go · GitHub
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class="octicon octicon-device-desktop"> <path d="M14.25 1c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 14.25 12h-3.727c.099 1.041.52 1.872 1.292 2.757A.752.752 0 0 1 11.25 16h-6.5a.75.75 0 0 1-.565-1.243c.772-.885 1.192-1.716 1.292-2.757H1.75A1.75 1.75 0 0 1 0 10.25v-7.5C0 1.784.784 1 1.75 1ZM1.75 2.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25ZM9.018 12H6.982a5.72 5.72 0 0 1-.765 2.5h3.566a5.72 5.72 0 0 1-.765-2.5Z"></path> </svg> </template> <div class="position-relative"> <ul role="listbox" class="ActionListWrap QueryBuilder-ListWrap" aria-label="Suggestions" data-action=" combobox-commit:query-builder#comboboxCommit mousedown:query-builder#resultsMousedown " data-target="query-builder.resultsList" data-persist-list=false id="query-builder-test-results" ></ul> </div> <div class="FormControl-inlineValidation" id="validation-678b6ea2-2507-4dcb-a80a-8fdad8fc8597" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> 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1.75V13.5h13.75a.75.75 0 0 1 0 1.5H.75a.75.75 0 0 1-.75-.75V1.75a.75.75 0 0 1 1.5 0Zm14.28 2.53-5.25 5.25a.75.75 0 0 1-1.06 0L7 7.06 4.28 9.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.25-3.25a.75.75 0 0 1 1.06 0L10 7.94l4.72-4.72a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Insights </span> </a> </li> </ul> </div></action-list> </div> </div></anchored-position> </focus-group> </action-menu></div> </nav> </div> <turbo-frame id="repo-content-turbo-frame" target="_top" data-turbo-action="advance" class=""> <div id="repo-content-pjax-container" class="repository-content " > <react-app app-name="issues-react" initial-path="/golang/go/issues/23427" style="display: block; min-height: calc(100vh - 64px);" data-attempted-ssr="true" data-ssr="true" data-lazy="false" data-alternate="false" data-data-router-enabled="false" > <script type="application/json" data-target="react-app.embeddedData">{"payload":{"preloaded_records":{},"preloadedQueries":[{"queryId":"98fbce80c1210854fef52742786b67c3","queryName":"IssueViewerViewQuery","variables":{"id":"repository","number":23427,"owner":"golang","repo":"go"},"result":{"data":{"repository":{"isOwnerEnterpriseManaged":false,"issue":{"id":"MDU6SXNzdWUyODgwODk4OTk=","updatedAt":"2024-10-07T11:25:23Z","title":"net/http: make Transport's idle connection management aware of DNS changes?","number":23427,"repository":{"nameWithOwner":"golang/go","id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","login":"golang","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI=","url":"https://github.com/golang"},"isArchived":false,"isPrivate":false,"databaseId":23096959,"slashCommandsEnabled":false,"viewerCanInteract":false,"viewerInteractionLimitReasonHTML":"","planFeatures":{"maximumAssignees":10},"visibility":"PUBLIC","pinnedIssues":{"totalCount":0},"viewerCanPinIssues":false,"issueTypes":{"edges":[{"node":{"id":"IT_kwDOAEHT7M4ABYTN"}},{"node":{"id":"IT_kwDOAEHT7M4ABYTO"}},{"node":{"id":"IT_kwDOAEHT7M4ABYTQ"}}]}},"titleHTML":"net/http: make Transport's idle connection management aware of DNS changes?","url":"https://github.com/golang/go/issues/23427","viewerCanUpdateNext":false,"issueType":null,"state":"OPEN","stateReason":null,"duplicateOf":null,"linkedPullRequests":{"nodes":[{"repository":{"nameWithOwner":"golang/go","id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","login":"golang","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI="}},"state":"OPEN","isDraft":false,"url":"https://github.com/golang/go/pull/46714","number":46714,"id":"MDExOlB1bGxSZXF1ZXN0NjY4NzIwNjMx"}]},"subIssuesSummary":{"total":0,"completed":0},"__isLabelable":"Issue","labels":{"edges":[{"node":{"id":"MDU6TGFiZWwzNzMzOTk5OTg=","color":"ededed","name":"NeedsFix","nameHTML":"NeedsFix","description":"The path to resolution is known, but the work has not been done.","url":"https://github.com/golang/go/labels/NeedsFix","__typename":"Label"},"cursor":"MQ"}],"pageInfo":{"endCursor":"MQ","hasNextPage":false}},"__isNode":"Issue","assignees":{"nodes":[]},"milestone":{"id":"MDk6TWlsZXN0b25lNDczNzA1OA==","title":"Backlog","closed":false,"dueOn":null,"progressPercentage":47.66860116069642,"url":"https://github.com/golang/go/milestone/117","closedAt":null},"databaseId":288089899,"viewerDidAuthor":false,"locked":false,"author":{"__typename":"User","__isActor":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy","profileUrl":"https://github.com/szuecs","avatarUrl":"https://avatars.githubusercontent.com/u/50872?u=47269ffb81654b5b574dc29e337178394bb4fe1d\u0026v=4"},"__isComment":"Issue","body":"\r\n\r\n### What version of Go are you using (`go version`)?\r\n\r\ngo version go1.9 linux/amd64\r\n\r\nand \r\n\r\ngo version go1.9.2 linux/amd64\r\n\r\n### Does this issue reproduce with the latest release?\r\n\r\nYes\r\n\r\n### What operating system and processor architecture are you using (`go env`)?\r\n\r\n% go env \r\nGOARCH=\"amd64\"\r\nGOBIN=\"/home/sszuecs/go/bin\"\r\nGOEXE=\"\"\r\nGOHOSTARCH=\"amd64\"\r\nGOHOSTOS=\"linux\"\r\nGOOS=\"linux\"\r\nGOPATH=\"/home/sszuecs/go\"\r\nGORACE=\"\"\r\nGOROOT=\"/usr/share/go\"\r\nGOTOOLDIR=\"/usr/share/go/pkg/tool/linux_amd64\"\r\nGCCGO=\"gccgo\"\r\nCC=\"gcc\"\r\nGOGCCFLAGS=\"-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build505089582=/tmp/go-build -gno-record-gcc-switches\"\r\nCXX=\"g++\"\r\nCGO_ENABLED=\"1\"\r\nCGO_CFLAGS=\"-g -O2\"\r\nCGO_CPPFLAGS=\"\"\r\nCGO_CXXFLAGS=\"-g -O2\"\r\nCGO_FFLAGS=\"-g -O2\"\r\nCGO_LDFLAGS=\"-g -O2\"\r\nPKG_CONFIG=\"pkg-config\"\r\n\r\n### What did you do?\r\n\r\nI am running `go run main.go` and change the /etc/hosts to change www.google.de to 127.0.0.1.\r\nDepending on the order it fails to switch DNS after IdleConnTimeout or it will never request DNS again. DNS will be tried to lookup in case you first target it to 127.0.0.1 and after that comment the entry in /etc/hosts. The problem is that if you want to change your target loadbalancers via DNS lookup, this will not be done. The workaround is commented in the code, which reliably will do the DNS failover. The problem seems to be that IdleConnTimeout is bigger then the time.Sleep duration in the code, which you can also change to see that this works. In case of being an edge proxy with high number of requests, the case IdleConnTimeout \u003c process-next-request will never happen.\r\n\r\n\r\n package main\r\n \r\n import (\r\n \t\"log\"\r\n \t\"net\"\r\n \t\"net/http\"\r\n \t\"time\"\r\n )\r\n \r\n func main() {\r\n \r\n \ttr := \u0026http.Transport{\r\n \t\tDialContext: (\u0026net.Dialer{\r\n \t\t\tTimeout: 5 * time.Second,\r\n \t\t\tKeepAlive: 30 * time.Second,\r\n \t\t\tDualStack: true,\r\n \t\t}).DialContext,\r\n \t\tTLSHandshakeTimeout: 5 * time.Second,\r\n \t\tIdleConnTimeout: 5 * time.Second,\r\n \t}\r\n \r\n \tgo func(rt http.RoundTripper) {\r\n \t\tfor {\r\n \t\t\ttime.Sleep(1 * time.Second)\r\n \r\n \t\t\treq, err := http.NewRequest(\"GET\", \"https://www.google.de/\", nil)\r\n \t\t\tif err != nil {\r\n \t\t\t\tlog.Printf(\"Failed to do request: %v\", err)\r\n \t\t\t\tcontinue\r\n \t\t\t}\r\n \r\n \t\t\tresp, err := rt.RoundTrip(req)\r\n \t\t\tif err != nil {\r\n \t\t\t\tlog.Printf(\"Failed to do roundtrip: %v\", err)\r\n \t\t\t\tcontinue\r\n \t\t\t}\r\n \t\t\t//io.Copy(ioutil.Discard, resp.Body)\r\n \t\t\tresp.Body.Close()\r\n \t\t\tlog.Printf(\"resp status: %v\", resp.Status)\r\n \t\t}\r\n \t}(tr)\r\n \r\n \t// FIX:\r\n \t// go func(transport *http.Transport) {\r\n \t// \tfor {\r\n \t// \t\ttime.Sleep(3 * time.Second)\r\n \t// \t\ttransport.CloseIdleConnections()\r\n \t// \t}\r\n \t// }(tr)\r\n \r\n \tch := make(chan struct{})\r\n \t\u003c-ch\r\n }\r\n\r\n\r\n### What did you expect to see?\r\n\r\nI want to to see that IdleConnTimeout will reliably close idle connections, such that DNS is queried for new connections again, similar to the goroutine case in the code. We need to slowly being able to fade traffic.\r\n\r\n### What did you see instead?\r\n\r\nIn case you start the application with /etc/hosts entry is not set, and then change it, it will never fail the request, so the new DNS lookup is not being made.","bodyHTML":"\u003ch3 dir=\"auto\"\u003eWhat version of Go are you using (\u003ccode class=\"notranslate\"\u003ego version\u003c/code\u003e)?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003ego version go1.9 linux/amd64\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eand\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ego version go1.9.2 linux/amd64\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eDoes this issue reproduce with the latest release?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eYes\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eWhat operating system and processor architecture are you using (\u003ccode class=\"notranslate\"\u003ego env\u003c/code\u003e)?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003e% go env\u003cbr\u003e\nGOARCH=\"amd64\"\u003cbr\u003e\nGOBIN=\"/home/sszuecs/go/bin\"\u003cbr\u003e\nGOEXE=\"\"\u003cbr\u003e\nGOHOSTARCH=\"amd64\"\u003cbr\u003e\nGOHOSTOS=\"linux\"\u003cbr\u003e\nGOOS=\"linux\"\u003cbr\u003e\nGOPATH=\"/home/sszuecs/go\"\u003cbr\u003e\nGORACE=\"\"\u003cbr\u003e\nGOROOT=\"/usr/share/go\"\u003cbr\u003e\nGOTOOLDIR=\"/usr/share/go/pkg/tool/linux_amd64\"\u003cbr\u003e\nGCCGO=\"gccgo\"\u003cbr\u003e\nCC=\"gcc\"\u003cbr\u003e\nGOGCCFLAGS=\"-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build505089582=/tmp/go-build -gno-record-gcc-switches\"\u003cbr\u003e\nCXX=\"g++\"\u003cbr\u003e\nCGO_ENABLED=\"1\"\u003cbr\u003e\nCGO_CFLAGS=\"-g -O2\"\u003cbr\u003e\nCGO_CPPFLAGS=\"\"\u003cbr\u003e\nCGO_CXXFLAGS=\"-g -O2\"\u003cbr\u003e\nCGO_FFLAGS=\"-g -O2\"\u003cbr\u003e\nCGO_LDFLAGS=\"-g -O2\"\u003cbr\u003e\nPKG_CONFIG=\"pkg-config\"\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eWhat did you do?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eI am running \u003ccode class=\"notranslate\"\u003ego run main.go\u003c/code\u003e and change the /etc/hosts to change \u003ca href=\"http://www.google.de\" rel=\"nofollow\"\u003ewww.google.de\u003c/a\u003e to 127.0.0.1.\u003cbr\u003e\nDepending on the order it fails to switch DNS after IdleConnTimeout or it will never request DNS again. DNS will be tried to lookup in case you first target it to 127.0.0.1 and after that comment the entry in /etc/hosts. The problem is that if you want to change your target loadbalancers via DNS lookup, this will not be done. The workaround is commented in the code, which reliably will do the DNS failover. The problem seems to be that IdleConnTimeout is bigger then the time.Sleep duration in the code, which you can also change to see that this works. In case of being an edge proxy with high number of requests, the case IdleConnTimeout \u0026lt; process-next-request will never happen.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"package main\n\nimport (\n\t\u0026quot;log\u0026quot;\n\t\u0026quot;net\u0026quot;\n\t\u0026quot;net/http\u0026quot;\n\t\u0026quot;time\u0026quot;\n)\n\nfunc main() {\n\n\ttr := \u0026amp;http.Transport{\n\t\tDialContext: (\u0026amp;net.Dialer{\n\t\t\tTimeout: 5 * time.Second,\n\t\t\tKeepAlive: 30 * time.Second,\n\t\t\tDualStack: true,\n\t\t}).DialContext,\n\t\tTLSHandshakeTimeout: 5 * time.Second,\n\t\tIdleConnTimeout: 5 * time.Second,\n\t}\n\n\tgo func(rt http.RoundTripper) {\n\t\tfor {\n\t\t\ttime.Sleep(1 * time.Second)\n\n\t\t\treq, err := http.NewRequest(\u0026quot;GET\u0026quot;, \u0026quot;https://www.google.de/\u0026quot;, nil)\n\t\t\tif err != nil {\n\t\t\t\tlog.Printf(\u0026quot;Failed to do request: %v\u0026quot;, err)\n\t\t\t\tcontinue\n\t\t\t}\n\n\t\t\tresp, err := rt.RoundTrip(req)\n\t\t\tif err != nil {\n\t\t\t\tlog.Printf(\u0026quot;Failed to do roundtrip: %v\u0026quot;, err)\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\t//io.Copy(ioutil.Discard, resp.Body)\n\t\t\tresp.Body.Close()\n\t\t\tlog.Printf(\u0026quot;resp status: %v\u0026quot;, resp.Status)\n\t\t}\n\t}(tr)\n\n\t// FIX:\n\t// go func(transport *http.Transport) {\n\t// \tfor {\n\t// \t\ttime.Sleep(3 * time.Second)\n\t// \t\ttransport.CloseIdleConnections()\n\t// \t}\n\t// }(tr)\n\n\tch := make(chan struct{})\n\t\u0026lt;-ch\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003epackage main\n\nimport (\n\t\"log\"\n\t\"net\"\n\t\"net/http\"\n\t\"time\"\n)\n\nfunc main() {\n\n\ttr := \u0026amp;http.Transport{\n\t\tDialContext: (\u0026amp;net.Dialer{\n\t\t\tTimeout: 5 * time.Second,\n\t\t\tKeepAlive: 30 * time.Second,\n\t\t\tDualStack: true,\n\t\t}).DialContext,\n\t\tTLSHandshakeTimeout: 5 * time.Second,\n\t\tIdleConnTimeout: 5 * time.Second,\n\t}\n\n\tgo func(rt http.RoundTripper) {\n\t\tfor {\n\t\t\ttime.Sleep(1 * time.Second)\n\n\t\t\treq, err := http.NewRequest(\"GET\", \"https://www.google.de/\", nil)\n\t\t\tif err != nil {\n\t\t\t\tlog.Printf(\"Failed to do request: %v\", err)\n\t\t\t\tcontinue\n\t\t\t}\n\n\t\t\tresp, err := rt.RoundTrip(req)\n\t\t\tif err != nil {\n\t\t\t\tlog.Printf(\"Failed to do roundtrip: %v\", err)\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\t//io.Copy(ioutil.Discard, resp.Body)\n\t\t\tresp.Body.Close()\n\t\t\tlog.Printf(\"resp status: %v\", resp.Status)\n\t\t}\n\t}(tr)\n\n\t// FIX:\n\t// go func(transport *http.Transport) {\n\t// \tfor {\n\t// \t\ttime.Sleep(3 * time.Second)\n\t// \t\ttransport.CloseIdleConnections()\n\t// \t}\n\t// }(tr)\n\n\tch := make(chan struct{})\n\t\u0026lt;-ch\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003ch3 dir=\"auto\"\u003eWhat did you expect to see?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eI want to to see that IdleConnTimeout will reliably close idle connections, such that DNS is queried for new connections again, similar to the goroutine case in the code. We need to slowly being able to fade traffic.\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eWhat did you see instead?\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eIn case you start the application with /etc/hosts entry is not set, and then change it, it will never fail the request, so the new DNS lookup is not being made.\u003c/p\u003e","bodyVersion":"3f2cb90d98736faf3cb95abf5e3b83c6588265fcdc6ae93815966f61337c8149","createdAt":"2018-01-12T11:28:45Z","__isReactable":"Issue","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":30,"nodes":[{"__typename":"User","login":"addityasingh","__isNode":"User","id":"MDQ6VXNlcjUzNTEyNjI="},{"__typename":"User","login":"albertjin","__isNode":"User","id":"MDQ6VXNlcjY0MDE1MQ=="},{"__typename":"User","login":"paulquerna-okta","__isNode":"User","id":"MDQ6VXNlcjQxMjY3MTkw"},{"__typename":"User","login":"umiyosh","__isNode":"User","id":"MDQ6VXNlcjUxMzM5Ng=="},{"__typename":"User","login":"ruiaraujo","__isNode":"User","id":"MDQ6VXNlcjMwMzgzMw=="}]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"viewerCanUpdateMetadata":false,"viewerCanComment":false,"viewerCanAssign":false,"viewerCanLabel":false,"__isIssueOrPullRequest":"Issue","projectItemsNext":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"viewerCanSetMilestone":false,"isPinned":false,"viewerCanDelete":false,"viewerCanTransfer":false,"viewerCanConvertToDiscussion":false,"viewerCanLock":false,"viewerCanType":false,"frontTimelineItems":{"pageInfo":{"hasNextPage":true,"endCursor":"Y3Vyc29yOnYyOpPPAAABY94UWtACqTY5NzIyNjE0Ng=="},"totalCount":98,"edges":[{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":1421975849,"createdAt":"2018-01-12T15:36:58Z","actor":{"__typename":"User","login":"bradfitz","id":"MDQ6VXNlcjI2MjE=","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/2621?s=64\u0026u=6deb06d9916328265486504f364c80ec2d969f2c\u0026v=4"},"currentTitle":"net/http: 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made."},"__isNode":"UnlabeledEvent","id":"MDE0OlVubGFiZWxlZEV2ZW50MTQyMTk3ODMyNQ=="},"cursor":"Y3Vyc29yOnYyOpPPAAABYOsFdqABqjE0MjE5NzgzMjU="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":357271226,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy"},"id":"MDU6SXNzdWUyODgwODk4OTk=","number":23427,"locked":false,"databaseId":288089899},"author":{"__typename":"User","login":"bradfitz","avatarUrl":"https://avatars.githubusercontent.com/u/2621?u=6deb06d9916328265486504f364c80ec2d969f2c\u0026v=4","id":"MDQ6VXNlcjI2MjE="},"id":"MDEyOklzc3VlQ29tbWVudDM1NzI3MTIyNg==","body":"/cc @tombergan ","bodyHTML":"\u003cp dir=\"auto\"\u003e/cc \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/tombergan/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/tombergan\"\u003e@tombergan\u003c/a\u003e\u003c/p\u003e","bodyVersion":"505512e5eaad5f3a86496f66f25b6871681443c896966189e36bd46e68b2606d","viewerCanUpdate":false,"url":"https://github.com/golang/go/issues/23427#issuecomment-357271226","createdAt":"2018-01-12T15:38:17Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI=","login":"golang","url":"https://github.com/golang"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"golang/go","databaseId":23096959},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABYOsFiigAqTM1NzI3MTIyNg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":368765024,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy"},"id":"MDU6SXNzdWUyODgwODk4OTk=","number":23427,"locked":false,"databaseId":288089899},"author":{"__typename":"User","login":"meirf","avatarUrl":"https://avatars.githubusercontent.com/u/2043305?v=4","id":"MDQ6VXNlcjIwNDMzMDU="},"id":"MDEyOklzc3VlQ29tbWVudDM2ODc2NTAyNA==","body":"**Possible Signals**\r\n\r\nIf `persistConn.conn` is dialed via hostname:\r\n- _TTL expiration_. If TTL expires, take action. This would require an API change since [`net`'s TTL doesn't appear to be exposed](https://github.com/golang/go/blob/ed6c6c9c11496ed8e458f6e0731103126ce60223/src/net/dnsmsg.go#L130).\r\n- _Poll `LookupIP`_. Store initial ip set and keep updating with new polling response; if ip set changes (or more strictly if dialed ip is not longer in ip set), take action. How frequently would we poll? Are we willing to store this extra state, spend this time polling, using system resourced even with [optimizations](https://github.com/golang/go/issues/23866)?\r\n\r\n**Action**\r\n\r\n- _Close/mark for closure_. If the connection is idle, close it. If the connection is in use, mark it as not reusable. This would be similar to current usage of `persistConn.broken` though \"broken\" maybe too harsh language for this case. (The OP uses `CloseIdleConnections`, which \"does not interrupt any connections currently in use\", so calling `CloseIdleConnections` once could leave many connections on the old ips.)\r\n\r\nI guess the use of \"?\" in the title was due to implementation complexity/propriety of addressing this in the standard library. Please let me know if I've gotten something wrong or if there are other issues I'm missing.","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003cstrong\u003ePossible Signals\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf \u003ccode class=\"notranslate\"\u003epersistConn.conn\u003c/code\u003e is dialed via hostname:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cem\u003eTTL expiration\u003c/em\u003e. If TTL expires, take action. This would require an API change since \u003ca href=\"https://github.com/golang/go/blob/ed6c6c9c11496ed8e458f6e0731103126ce60223/src/net/dnsmsg.go#L130\"\u003e\u003ccode class=\"notranslate\"\u003enet\u003c/code\u003e's TTL doesn't appear to be exposed\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003e\u003cem\u003ePoll \u003ccode class=\"notranslate\"\u003eLookupIP\u003c/code\u003e\u003c/em\u003e. Store initial ip set and keep updating with new polling response; if ip set changes (or more strictly if dialed ip is not longer in ip set), take action. How frequently would we poll? Are we willing to store this extra state, spend this time polling, using system resourced even with \u003ca href=\"https://github.com/golang/go/issues/23866\" data-hovercard-type=\"issue\" data-hovercard-url=\"/golang/go/issues/23866/hovercard\"\u003eoptimizations\u003c/a\u003e?\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eAction\u003c/strong\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cem\u003eClose/mark for closure\u003c/em\u003e. If the connection is idle, close it. If the connection is in use, mark it as not reusable. This would be similar to current usage of \u003ccode class=\"notranslate\"\u003epersistConn.broken\u003c/code\u003e though \"broken\" maybe too harsh language for this case. (The OP uses \u003ccode class=\"notranslate\"\u003eCloseIdleConnections\u003c/code\u003e, which \"does not interrupt any connections currently in use\", so calling \u003ccode class=\"notranslate\"\u003eCloseIdleConnections\u003c/code\u003e once could leave many connections on the old ips.)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eI guess the use of \"?\" in the title was due to implementation complexity/propriety of addressing this in the standard library. Please let me know if I've gotten something wrong or if there are other issues I'm missing.\u003c/p\u003e","bodyVersion":"0f7be92d16a2eab2e17fd0183fdb26e9a679e5ebe800c45b2d7c14dc9f81c64d","viewerCanUpdate":false,"url":"https://github.com/golang/go/issues/23427#issuecomment-368765024","createdAt":"2018-02-27T06:47:34Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI=","login":"golang","url":"https://github.com/golang"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"golang/go","databaseId":23096959},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABYdYEL3AAqTM2ODc2NTAyNA=="},{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":1493948714,"createdAt":"2018-02-27T09:46:39Z","actor":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/50872?s=64\u0026u=47269ffb81654b5b574dc29e337178394bb4fe1d\u0026v=4"},"currentTitle":"net/http: make Transport's idle connection management aware of DNS changes","previousTitle":"net/http: make Transport's idle connection management aware of DNS changes?","__isNode":"RenamedTitleEvent","id":"MDE3OlJlbmFtZWRUaXRsZUV2ZW50MTQ5Mzk0ODcxNA=="},"cursor":"Y3Vyc29yOnYyOpPPAAABYdaoJBgBqjE0OTM5NDg3MTQ="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":368812025,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy"},"id":"MDU6SXNzdWUyODgwODk4OTk=","number":23427,"locked":false,"databaseId":288089899},"author":{"__typename":"User","login":"szuecs","avatarUrl":"https://avatars.githubusercontent.com/u/50872?u=47269ffb81654b5b574dc29e337178394bb4fe1d\u0026v=4","id":"MDQ6VXNlcjUwODcy"},"id":"MDEyOklzc3VlQ29tbWVudDM2ODgxMjAyNQ==","body":"@meirf For us `CloseIdleConnections` works pretty well, we use it in our internet facing central ingress http proxy and it's fast enough to do the DNS lookup while we do DNS based traffic switching (AWS route53 Weighted DNS records). If you would use `IdleConnTimeout` to call `CloseIdleConnections` would not do a breaking change of the API. I bet it would be in 99.999% of the cases fine, because applications, also proxies, are most of the time CPU bound.\r\nMy question would be why you want to expose additional data if you already have `IdleConnTimeout`?\r\n\r\nTo answer your question about \"?\" in the title: I don't remember the why. I deleted it from the title. I am only digging from time to time into the Go src code, mostly in the `net` package. I guess with the \"?\" I wanted to reflect that. I hope it's now more clear. :)","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/meirf/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/meirf\"\u003e@meirf\u003c/a\u003e For us \u003ccode class=\"notranslate\"\u003eCloseIdleConnections\u003c/code\u003e works pretty well, we use it in our internet facing central ingress http proxy and it's fast enough to do the DNS lookup while we do DNS based traffic switching (AWS route53 Weighted DNS records). If you would use \u003ccode class=\"notranslate\"\u003eIdleConnTimeout\u003c/code\u003e to call \u003ccode class=\"notranslate\"\u003eCloseIdleConnections\u003c/code\u003e would not do a breaking change of the API. I bet it would be in 99.999% of the cases fine, because applications, also proxies, are most of the time CPU bound.\u003cbr\u003e\nMy question would be why you want to expose additional data if you already have \u003ccode class=\"notranslate\"\u003eIdleConnTimeout\u003c/code\u003e?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo answer your question about \"?\" in the title: I don't remember the why. I deleted it from the title. I am only digging from time to time into the Go src code, mostly in the \u003ccode class=\"notranslate\"\u003enet\u003c/code\u003e package. I guess with the \"?\" I wanted to reflect that. I hope it's now more clear. :)\u003c/p\u003e","bodyVersion":"e0f0d1bda2807708116c54464fc5b664c3d97bf9b2d6dee42f2b56787c045b7d","viewerCanUpdate":false,"url":"https://github.com/golang/go/issues/23427#issuecomment-368812025","createdAt":"2018-02-27T09:48:39Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI=","login":"golang","url":"https://github.com/golang"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"golang/go","databaseId":23096959},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABYdap-NgAqTM2ODgxMjAyNQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":369137319,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy"},"id":"MDU6SXNzdWUyODgwODk4OTk=","number":23427,"locked":false,"databaseId":288089899},"author":{"__typename":"User","login":"meirf","avatarUrl":"https://avatars.githubusercontent.com/u/2043305?v=4","id":"MDQ6VXNlcjIwNDMzMDU="},"id":"MDEyOklzc3VlQ29tbWVudDM2OTEzNzMxOQ==","body":"tl;dr (1) Idle connections' awareness of dns changes appears to be absent from the API. (2) The easy part is forcing a redial via closure. (3) IMO the hard part is figuring out what signal the code should use to redial.\r\n\r\n@szuecs\r\nMy first comment was directed to bradfitz, who set the title to [\"net/http: make Transport's idle connection management aware of DNS changes?\"](https://github.com/golang/go/issues/23427#event-1421975849).\r\n\r\nBased on my reading of your most recent comment, you think idle connections' awareness of dns changes is already promised by the current API. I (and bradfitz based on his title) do not agree that idle connections' awareness of dns changes is already promised.\r\n\r\nI think we agree that currently the only way to be aware of a dns change is to force a redial by not having connections kept alive, but IdleConnTimeout won't force a keep-alive connection to be closed unless your situation meet its definition. If you have a keep-alive connection and it never becomes idle, by definition it will never close itself due to IdleConnTimeout. _The cumulative amount of time a keep-alive connection is idle doesn't matter. The only way the keep-alive connection will be closed due to IdleConnTimeout is if it's idle for IdleConnTimeout consecutive/contiguous time._\r\n\r\n1. To prevent any connections from being kept alive you can set DisableKeepAlives.\r\n2. To increase the likelihood of a keep-alive connection being closed, you can decrease IdleConnTimeout.\r\n3. To close all currently idle keep-alive connections, you can call CloseIdleConnections.\r\n\r\nIt's clear that all these would be helpful to you in redialing and therefore connecting to the new ip. This indirectly results in dns awareness (and possibly a lot of inefficiency). But in terms of the standard library, there is no promise of direct dns awareness.\r\n\r\n\u003e If you would use IdleConnTimeout to call CloseIdleConnections would not do a breaking change of the API.\r\n\r\nBriefly touching upon implementation, I don't think dns awareness in the standard library would use CloseIdleConnections since that blindly closes all keep-alive connections and I'd guess that we'd want dns change detection to be done per connection.","bodyHTML":"\u003cp dir=\"auto\"\u003etl;dr (1) Idle connections' awareness of dns changes appears to be absent from the API. (2) The easy part is forcing a redial via closure. (3) IMO the hard part is figuring out what signal the code should use to redial.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/szuecs/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/szuecs\"\u003e@szuecs\u003c/a\u003e\u003cbr\u003e\nMy first comment was directed to bradfitz, who set the title to \u003ca href=\"https://github.com/golang/go/issues/23427#event-1421975849\" data-hovercard-type=\"issue\" data-hovercard-url=\"/golang/go/issues/23427/hovercard\"\u003e\"net/http: make Transport's idle connection management aware of DNS changes?\"\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBased on my reading of your most recent comment, you think idle connections' awareness of dns changes is already promised by the current API. I (and bradfitz based on his title) do not agree that idle connections' awareness of dns changes is already promised.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think we agree that currently the only way to be aware of a dns change is to force a redial by not having connections kept alive, but IdleConnTimeout won't force a keep-alive connection to be closed unless your situation meet its definition. If you have a keep-alive connection and it never becomes idle, by definition it will never close itself due to IdleConnTimeout. \u003cem\u003eThe cumulative amount of time a keep-alive connection is idle doesn't matter. The only way the keep-alive connection will be closed due to IdleConnTimeout is if it's idle for IdleConnTimeout consecutive/contiguous time.\u003c/em\u003e\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003eTo prevent any connections from being kept alive you can set DisableKeepAlives.\u003c/li\u003e\n\u003cli\u003eTo increase the likelihood of a keep-alive connection being closed, you can decrease IdleConnTimeout.\u003c/li\u003e\n\u003cli\u003eTo close all currently idle keep-alive connections, you can call CloseIdleConnections.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003eIt's clear that all these would be helpful to you in redialing and therefore connecting to the new ip. This indirectly results in dns awareness (and possibly a lot of inefficiency). But in terms of the standard library, there is no promise of direct dns awareness.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf you would use IdleConnTimeout to call CloseIdleConnections would not do a breaking change of the API.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eBriefly touching upon implementation, I don't think dns awareness in the standard library would use CloseIdleConnections since that blindly closes all keep-alive connections and I'd guess that we'd want dns change detection to be done per connection.\u003c/p\u003e","bodyVersion":"08798b0c337e5371c849b8d025b92abb021ff6ad40552df058c9578b21c29644","viewerCanUpdate":false,"url":"https://github.com/golang/go/issues/23427#issuecomment-369137319","createdAt":"2018-02-28T06:39:18Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMzA5Njk1OQ==","name":"go","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjQzMTQwOTI=","login":"golang","url":"https://github.com/golang"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"golang/go","databaseId":23096959},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2018-02-28T07:12:46Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/meirf","login":"meirf","id":"MDQ6VXNlcjIwNDMzMDU="},"id":"MDE1OlVzZXJDb250ZW50RWRpdDY0NTcxNzEz"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABYdsi-fAAqTM2OTEzNzMxOQ=="},{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":1496801111,"createdAt":"2018-02-28T14:17:18Z","actor":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/50872?s=64\u0026u=47269ffb81654b5b574dc29e337178394bb4fe1d\u0026v=4"},"currentTitle":"net/http: make Transport's idle connection management aware of DNS changes?","previousTitle":"net/http: make Transport's idle connection management aware of DNS changes","__isNode":"RenamedTitleEvent","id":"MDE3OlJlbmFtZWRUaXRsZUV2ZW50MTQ5NjgwMTExMQ=="},"cursor":"Y3Vyc29yOnYyOpPPAAABYdzGSbABqjE0OTY4MDExMTE="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":369252909,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"szuecs","id":"MDQ6VXNlcjUwODcy"},"id":"MDU6SXNzdWUyODgwODk4OTk=","number":23427,"locked":false,"databaseId":288089899},"author":{"__typename":"User","login":"szuecs","avatarUrl":"https://avatars.githubusercontent.com/u/50872?u=47269ffb81654b5b574dc29e337178394bb4fe1d\u0026v=4","id":"MDQ6VXNlcjUwODcy"},"id":"MDEyOklzc3VlQ29tbWVudDM2OTI1MjkwOQ==","body":"@meirf Ok I was not sure if questions were asked to me. As far as I understand now you did not asked me. :)\r\nI put again the \"?\" in the title, because the change was not done by me (I should read the events). \r\nThanks for your comments!","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/meirf/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/meirf\"\u003e@meirf\u003c/a\u003e Ok I was not sure if questions were asked to me. As far as I understand now you did not asked me. :)\u003cbr\u003e\nI put again the \"?\" in the title, because the change was not done by me (I should read the events).\u003cbr\u003e\nThanks for your 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class="Avatar-module__avatarLink--S36bm Avatar-module__avatarOuter--MZJZH prc-Link-Link-85e08" href="/szuecs" data-hovercard-url="/users/szuecs/hovercard" aria-label="@szuecs's profile"><img data-component="Avatar" class="Avatar-module__issueViewerAvatar--grA_h prc-Avatar-Avatar-ZRS-m" alt="@szuecs" width="40" height="40" style="--avatarSize-regular:40px" src="https://avatars.githubusercontent.com/u/50872?u=47269ffb81654b5b574dc29e337178394bb4fe1d&v=4&size=80" data-testid="github-avatar"/></a><div data-testid="issue-body" class="Box-sc-g0xbh4-0 bDlPR react-issue-body" data-hpc="true"><h2 class="sr-only">Description</h2><div class="Box-sc-g0xbh4-0 crMLA-D"><div class="Box-sc-g0xbh4-0 bjwYme"><div class="Box-sc-g0xbh4-0 jSpDiO"><div class="Box-sc-g0xbh4-0 fnEhwD ActivityHeader-module__activityHeader--Flalv"><div class="Box-sc-g0xbh4-0 iKiGfw Avatar-module__avatarInner--rVuJD"><a class="Avatar-module__avatarLink--S36bm prc-Link-Link-85e08" href="/szuecs" data-hovercard-url="/users/szuecs/hovercard" aria-label="@szuecs's profile"><img data-component="Avatar" class="prc-Avatar-Avatar-ZRS-m" alt="@szuecs" width="24" height="24" style="--avatarSize-regular:24px" src="https://avatars.githubusercontent.com/u/50872?u=47269ffb81654b5b574dc29e337178394bb4fe1d&v=4&size=48" data-testid="github-avatar"/></a></div><div class="Box-sc-g0xbh4-0 koxHLL ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 dqmClk"><a class="Box-sc-g0xbh4-0 cRhwji prc-Link-Link-85e08" href="https://github.com/szuecs" data-hovercard-url="/users/szuecs/hovercard" data-testid="issue-body-header-author">szuecs</a></div><div class="Box-sc-g0xbh4-0 bJQcYY ActivityHeader-module__footer--FVHp7"><span>opened </span><a class="Box-sc-g0xbh4-0 bjFvWy prc-Link-Link-85e08" href="https://github.com/golang/go/issues/23427#issue-288089899" data-testid="issue-body-header-link"><relative-time sx="[object Object]" class="sc-aXZVg gcWyXp">on <!-- -->Jan 12, 2018</relative-time></a></div></div><div class="Box-sc-g0xbh4-0 kgTqOk ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 izrTon ActivityHeader-module__edits--LwHTE"></div><div class="Box-sc-g0xbh4-0 kpoUe"><div class="Box-sc-g0xbh4-0 ezcJRX"></div><div class="Box-sc-g0xbh4-0 dnyPuu"><button data-component="IconButton" type="button" aria-label="Issue body actions" aria-haspopup="true" aria-expanded="false" tabindex="0" class="Box-sc-g0xbh4-0 ffkqe prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":R15bd5db:-loading-announcement" id=":R15bd5db:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button></div></div></div></div></div><div class="IssueBodyViewer-module__IssueBody--MXyFt"><div data-testid="markdown-body" data-team-hovercards-enabled="true" class="markdown-body" data-turbolinks="false"><div class="Box-sc-g0xbh4-0 markdown-body NewMarkdownViewer-module__safe-html-box--cRsz0"><h3 dir="auto">What version of Go are you using (<code class="notranslate">go version</code>)?</h3> <p dir="auto">go version go1.9 linux/amd64</p> <p dir="auto">and</p> <p dir="auto">go version go1.9.2 linux/amd64</p> <h3 dir="auto">Does this issue reproduce with the latest release?</h3> <p dir="auto">Yes</p> <h3 dir="auto">What operating system and processor architecture are you using (<code class="notranslate">go env</code>)?</h3> <p dir="auto">% go env<br> GOARCH="amd64"<br> GOBIN="/home/sszuecs/go/bin"<br> GOEXE=""<br> GOHOSTARCH="amd64"<br> GOHOSTOS="linux"<br> GOOS="linux"<br> GOPATH="/home/sszuecs/go"<br> GORACE=""<br> GOROOT="/usr/share/go"<br> GOTOOLDIR="/usr/share/go/pkg/tool/linux_amd64"<br> GCCGO="gccgo"<br> CC="gcc"<br> GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build505089582=/tmp/go-build -gno-record-gcc-switches"<br> CXX="g++"<br> CGO_ENABLED="1"<br> CGO_CFLAGS="-g -O2"<br> CGO_CPPFLAGS=""<br> CGO_CXXFLAGS="-g -O2"<br> CGO_FFLAGS="-g -O2"<br> CGO_LDFLAGS="-g -O2"<br> PKG_CONFIG="pkg-config"</p> <h3 dir="auto">What did you do?</h3> <p dir="auto">I am running <code class="notranslate">go run main.go</code> and change the /etc/hosts to change <a href="http://www.google.de" rel="nofollow">www.google.de</a> to 127.0.0.1.<br> Depending on the order it fails to switch DNS after IdleConnTimeout or it will never request DNS again. DNS will be tried to lookup in case you first target it to 127.0.0.1 and after that comment the entry in /etc/hosts. The problem is that if you want to change your target loadbalancers via DNS lookup, this will not be done. The workaround is commented in the code, which reliably will do the DNS failover. The problem seems to be that IdleConnTimeout is bigger then the time.Sleep duration in the code, which you can also change to see that this works. In case of being an edge proxy with high number of requests, the case IdleConnTimeout < process-next-request will never happen.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="package main import ( "log" "net" "net/http" "time" ) func main() { tr := &http.Transport{ DialContext: (&net.Dialer{ Timeout: 5 * time.Second, KeepAlive: 30 * time.Second, DualStack: true, }).DialContext, TLSHandshakeTimeout: 5 * time.Second, IdleConnTimeout: 5 * time.Second, } go func(rt http.RoundTripper) { for { time.Sleep(1 * time.Second) req, err := http.NewRequest("GET", "https://www.google.de/", nil) if err != nil { log.Printf("Failed to do request: %v", err) continue } resp, err := rt.RoundTrip(req) if err != nil { log.Printf("Failed to do roundtrip: %v", err) continue } //io.Copy(ioutil.Discard, resp.Body) resp.Body.Close() log.Printf("resp status: %v", resp.Status) } }(tr) // FIX: // go func(transport *http.Transport) { // for { // time.Sleep(3 * time.Second) // transport.CloseIdleConnections() // } // }(tr) ch := make(chan struct{}) <-ch }"><pre class="notranslate"><code class="notranslate">package main import ( "log" "net" "net/http" "time" ) func main() { tr := &http.Transport{ DialContext: (&net.Dialer{ Timeout: 5 * time.Second, KeepAlive: 30 * time.Second, DualStack: true, }).DialContext, TLSHandshakeTimeout: 5 * time.Second, IdleConnTimeout: 5 * time.Second, } go func(rt http.RoundTripper) { for { time.Sleep(1 * time.Second) req, err := http.NewRequest("GET", "https://www.google.de/", nil) if err != nil { log.Printf("Failed to do request: %v", err) continue } resp, err := rt.RoundTrip(req) if err != nil { log.Printf("Failed to do roundtrip: %v", err) continue } //io.Copy(ioutil.Discard, resp.Body) resp.Body.Close() log.Printf("resp status: %v", resp.Status) } }(tr) // FIX: // go func(transport *http.Transport) { // for { // time.Sleep(3 * time.Second) // transport.CloseIdleConnections() // } // }(tr) ch := make(chan struct{}) <-ch } </code></pre></div> <h3 dir="auto">What did you expect to see?</h3> <p dir="auto">I want to to see that IdleConnTimeout will reliably close idle connections, such that DNS is queried for new connections again, similar to the goroutine case in the code. We need to slowly being able to fade traffic.</p> <h3 dir="auto">What did you see instead?</h3> <p dir="auto">In case you start the application with /etc/hosts entry is not set, and then change it, it will never fail the request, so the new DNS lookup is not being made.</p></div></div><div class="IssueBodyViewer-module__IssueBodyTaskList--r4XEH"><!--$--><div role="toolbar" aria-label="Reactions" class="d-flex gap-1 flex-wrap"><span role="tooltip" aria-label="addityasingh, albertjin, paulquerna-okta, umiyosh, ruiaraujo and 25 more" id=":R3el5db:" class="Tooltip__TooltipBase-sc-17tf59c-0 dNXcPh tooltipped-ne tooltipped-align-left-2 tooltipped-multiline"><button type="button" aria-label="Unreact with 👍 (5 👍 reactions so far, including addityasingh, albertjin, paulquerna-okta, umiyosh, ruiaraujo and 25 more)" role="switch" aria-checked="false" class="Box-sc-g0xbh4-0 iwvKpZ prc-Button-ButtonBase-c50BI" data-loading="false" data-size="small" data-variant="default" 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