{"action":"opened","issue":{"url":"https://api.github.com/repos/Automattic/mongoose/issues/4509","repository_url":"https://api.github.com/repos/Automattic/mongoose","labels_url":"https://api.github.com/repos/Automattic/mongoose/issues/4509/labels{/name}","comments_url":"https://api.github.com/repos/Automattic/mongoose/issues/4509/comments","events_url":"https://api.github.com/repos/Automattic/mongoose/issues/4509/events","html_url":"https://github.com/Automattic/mongoose/issues/4509","id":176339630,"number":4509,"title":"At the same time to send two requests，can't set headers after they are sent","user":{"login":"hclscut","id":5268064,"avatar_url":"https://avatars.githubusercontent.com/u/5268064?v=3","gravatar_id":"","url":"https://api.github.com/users/hclscut","html_url":"https://github.com/hclscut","followers_url":"https://api.github.com/users/hclscut/followers","following_url":"https://api.github.com/users/hclscut/following{/other_user}","gists_url":"https://api.github.com/users/hclscut/gists{/gist_id}","starred_url":"https://api.github.com/users/hclscut/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hclscut/subscriptions","organizations_url":"https://api.github.com/users/hclscut/orgs","repos_url":"https://api.github.com/users/hclscut/repos","events_url":"https://api.github.com/users/hclscut/events{/privacy}","received_events_url":"https://api.github.com/users/hclscut/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-09-12T10:11:05Z","updated_at":"2016-09-12T10:11:05Z","closed_at":null,"body":"when I send two requests, express give the error can't set headers after they are sent.\r\n\r\nExcluded other reasons，In an mongoose findOne asynchronous callback，the error exist。\r\n\r\nwhen I remove the mongoose findOne asynchronous callback, the error disappear。"}}
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