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                ## 簡單請求 只要同時滿足以下兩大條件,就屬于簡單請求。: (1) 請求方法是以下三種方法之一: * HEAD * GET * POST (2)HTTP的頭信息不超出以下幾種字段: * Accept * Accept-Language * Content-Language * Last-Event-ID * Content-Type:只限于三個值`application/x-www-form-urlencoded`、`multipart/form-data`、`text/plain` 當瀏覽器發現發起的ajax請求是簡單請求時,會在請求頭中攜帶一個字段:`Origin`. 就是當前的域名. ![](https://box.kancloud.cn/28f0662e3975ba1542892c526e4366ed_1554x672.png) Origin中會指出當前請求屬于哪個域(協議+域名+端口)。服務會根據這個值決定是否允許其跨域。 如果服務器允許跨域,需要在返回的響應頭中攜帶下面信息: ``` Access-Control-Allow-Origin: http://manage.leyou.com Access-Control-Allow-Credentials: true Content-Type: text/html; charset=utf-8 ``` * Access-Control-Allow-Origin:可接受的域,是一個具體域名或者\*(代表任意域名) * Access-Control-Allow-Credentials:是否允許攜帶cookie,默認情況下,cors不會攜帶cookie,除非這個值是true > 有關cookie: 要想操作cookie,需要滿足3個條件: * 服務的響應頭中需要攜帶Access-Control-Allow-Credentials并且為true。 * 瀏覽器發起ajax需要指定withCredentials 為true * 響應頭中的Access-Control-Allow-Origin一定不能為\*,必須是指定的域名
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