node中express的，res.send() 或res.json()這類客戶端返回的方法僅返回一次，如果多次返回就會出現這個錯誤！
一般是因為 if…else 判斷時出錯
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Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
Express Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
Cannot set headers after they are sent to the client
node.js：Cannot set headers after they are sent to the client
Yii2 報錯 Headers already sent in
laravel 報錯 AUTH` failed: ERR Client sent AUTH, but no password is set
解決ERR Client sent AUTH, but no password is set
解決Warning: Cannot modify header information - headers already sent by
Warning: Cannot modify header information - headers already sent in Unknown on line 0
解決"ERR Client sent AUTH, but no password is set” 錯誤