把自己的小项目放在 heroku 上，但是所有牵扯到数据库的页面都不能访问， heroku run rake db:migrate 这条命令出现错误： A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. 这个错误， database.yml 配置： production: adapter: postgresql encoding: unicode database: DATABASE_URL pool: 5

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