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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                ### Cookie 和安全 Cookie 你可以使用 `set_cookie` 方法在用戶的瀏覽中設置 cookie: ``` class MainHandler(tornado.web.RequestHandler): def get(self): if not self.get_cookie("mycookie"): self.set_cookie("mycookie", "myvalue") self.write("Your cookie was not set yet!") else: self.write("Your cookie was set!") ``` Cookie 很容易被惡意的客戶端偽造。加入你想在 cookie 中保存當前登陸用戶的 id 之類的信息,你需要對 cookie 作簽名以防止偽造。Tornado 通過 `set_secure_cookie` 和 `get_secure_cookie` 方法直接支持了這種功能。 要使用這些方法,你需要在創建應用時提供一個密鑰,名字為 `cookie_secret`。 你可以把它作為一個關鍵詞參數傳入應用的設置中: ``` application = tornado.web.Application([ (r"/", MainHandler), ], cookie_secret="61oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=") ``` 簽名過的 cookie 中包含了編碼過的 cookie 值,另外還有一個時間戳和一個 [HMAC](http://en.wikipedia.org/wiki/HMAC) 簽名。如果 cookie 已經過期或者 簽名不匹配,`get_secure_cookie` 將返回 `None`,這和沒有設置 cookie 時的 返回值是一樣的。上面例子的安全 cookie 版本如下: ``` class MainHandler(tornado.web.RequestHandler): def get(self): if not self.get_secure_cookie("mycookie"): self.set_secure_cookie("mycookie", "myvalue") self.write("Your cookie was not set yet!") else: self.write("Your cookie was set!") ```
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