同一個瀏覽器打開多個標籤訪問同一個網站，只能等待其中一個執行完畢才能執行下一個（php的session鎖機制）

Many people are aware that modern browsers limit the number of concurrent connections to a specific domain to between 4 or 6. This means that if your web page loads dozens of asset files (js, images,

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