{"action":"created","issue":{"url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/210","labels_url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/210/labels{/name}","comments_url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/210/comments","events_url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/210/events","html_url":"https://github.com/aspnet/KestrelHttpServer/pull/210","id":107229150,"number":210,"title":"Fast path default header collection type","user":{"login":"benaadams","id":1142958,"avatar_url":"https://avatars.githubusercontent.com/u/1142958?v=3","gravatar_id":"","url":"https://api.github.com/users/benaadams","html_url":"https://github.com/benaadams","followers_url":"https://api.github.com/users/benaadams/followers","following_url":"https://api.github.com/users/benaadams/following{/other_user}","gists_url":"https://api.github.com/users/benaadams/gists{/gist_id}","starred_url":"https://api.github.com/users/benaadams/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/benaadams/subscriptions","organizations_url":"https://api.github.com/users/benaadams/orgs","repos_url":"https://api.github.com/users/benaadams/repos","events_url":"https://api.github.com/users/benaadams/events{/privacy}","received_events_url":"https://api.github.com/users/benaadams/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/aspnet/KestrelHttpServer/labels/cla-already-signed","name":"cla-already-signed","color":"009800"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":11,"created_at":"2015-09-18T15:55:55Z","updated_at":"2015-09-19T20:18:47Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/aspnet/KestrelHttpServer/pulls/210","html_url":"https://github.com/aspnet/KestrelHttpServer/pull/210","diff_url":"https://github.com/aspnet/KestrelHttpServer/pull/210.diff","patch_url":"https://github.com/aspnet/KestrelHttpServer/pull/210.patch"},"body":"Don't use interface's enumerable as it allocates"},"comment":{"url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/comments/141702860","html_url":"https://github.com/aspnet/KestrelHttpServer/pull/210#issuecomment-141702860","issue_url":"https://api.github.com/repos/aspnet/KestrelHttpServer/issues/210","id":141702860,"user":{"login":"benaadams","id":1142958,"avatar_url":"https://avatars.githubusercontent.com/u/1142958?v=3","gravatar_id":"","url":"https://api.github.com/users/benaadams","html_url":"https://github.com/benaadams","followers_url":"https://api.github.com/users/benaadams/followers","following_url":"https://api.github.com/users/benaadams/following{/other_user}","gists_url":"https://api.github.com/users/benaadams/gists{/gist_id}","starred_url":"https://api.github.com/users/benaadams/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/benaadams/subscriptions","organizations_url":"https://api.github.com/users/benaadams/orgs","repos_url":"https://api.github.com/users/benaadams/repos","events_url":"https://api.github.com/users/benaadams/events{/privacy}","received_events_url":"https://api.github.com/users/benaadams/received_events","type":"User","site_admin":false},"created_at":"2015-09-19T20:18:47Z","updated_at":"2015-09-19T20:18:47Z","body":"ThrowingInOnStartingResultsIn500Response\r\n\r\n> Assert.StartsWith() Failure:\r\nExpected: Date:\r\nActual:   Conte...\r\n\r\nIf I change https://github.com/aspnet/KestrelHttpServer/blob/dev/src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs#L391 to clearing the headers rather than creating a new set and add a Date header; then Kestrel produces the wrong output.\r\n\r\nTesting using coreclr"}}