chrome.proxy插件问题

Question

_function setProxy(){
var pac = "var FindProxyForURL = function(url, host){"+
"if(shExpMatch(url, 'https:*www.baidu.com*')"+
"){"+
"return 'PROXY 115.239.210.27:443';"+
"}"+
"return 'DIRECT'"+
"}";

var config = {
    mode: "pac_script",
    pacScript: {
        data: pac
    }
}


chrome.proxy.settings.set({value: config, scope: 'regular'}, function(){});

}
setProxy();

开发了个chrome proxy插件，测试了下http走代理是可以的，https走代理报ERR_TUNNEL_CONNECTION_FAILED错误，帮忙看下哪里错了，对chrome不熟