XMLHttpRequest（Ajax）沒法修改header中的Cookie

在調試接口的時候發現Jquery Ajax怎麼修改headers的Cookie都沒法生效，因而獲得了這個答案

另外還有一些也沒法修改，下面是不能修改的項目的數組

var forbiddenRequestHeaders = [
    "accept-charset",
    "accept-encoding",
    "access-control-request-headers",
    "access-control-request-method",
    "connection",
    "content-length",
    "content-transfer-encoding",
    "cookie",
    "cookie2",
    "date",
    "expect",
    "host",
    "keep-alive",
    "origin",
    "referer",
    "te",
    "trailer",
    "transfer-encoding",
    "upgrade",
    "via"   ];