同源策略 英文Same-origin policy ，主要是針對 Web瀏覽器跨域安全性的專有名詞。
同源策略可防止惡意腳本通過頁面修改等方式，使網頁訪問不再規範內的惡意檔案 or 敏感資訊。
同源策略的條件必須符合 :
- 域名相同
- 埠號相同
- 協定相同
以上條件一項不符，均視為不符合同源策略。
以 https://domain.com/aaa.html?abc=1為例子，以下列舉範例，來判斷是否符合同源策略
| URL | Outcome | Reason |
|---|---|---|
| https://domain.com/aaa.html?aaa/b.html | 同源 | |
| http://domain.com/aaa.html?abc=1 | 不同源 | 協定不同 |
| https://sub.domain.com/aaa.html?abc=1 | 不同源 | 域名不同 |
| https://domain.com:55/aaa.html?abc=1 | 不同源 | 埠號不同 |
| https://domain.com/aaa?s=123 | 同源 |
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