基于C#后臺(tái)調(diào)用跨域MVC服務(wù)及帶Cookie驗(yàn)證的實(shí)現(xiàn)

2020-01-24 03:24:21

字體：大中小

供稿：網(wǎng)友

背景
隨著富客戶端框架的盛行，以及眾多優(yōu)秀的前端js框架，很多情況我們會(huì)遇到跨域的問題，而js的ajax請(qǐng)求是不允許直接跨域訪問的，當(dāng)然你會(huì)說可以用JSONP等，但是由于代碼潔癖，不想在前端和后臺(tái)添加callback，而且很多情況你是無法控制的，需要牽連考慮太多的情況。

所以我直接繞過了，每個(gè)前端應(yīng)用，自帶一個(gè)通用后端服務(wù)代理，該服務(wù)解決跨域問題，自動(dòng)代理幫前臺(tái)獲取跨域的數(shù)據(jù)。

如何算跨域
雖然是個(gè)老問題，但是還是要提醒注意下兩點(diǎn)：同IP，不同端口，數(shù)據(jù)訪問是跨域的，但是Cookie訪問是可以的（這個(gè)讓我很難理解）

解決，源碼

復(fù)制代碼代碼如下:

　　　　CookieContainer cookieContainer = new CookieContainer();

　　　　 [HttpPost]
        public string CommonPost(string url)
        {
            log.Info(CookieHelper.GetCookie("ITDC_UserName") + "進(jìn)入方法CommonPost Url=" + url);
            Uri address = new Uri(System.Configuration.ConfigurationManager.AppSettings["RESTfulAPI"].ToString() + url);
            HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
　　　　　　　//遠(yuǎn)程服務(wù),需要加入cookie驗(yàn)證
            cookieContainer.Add(address, GetCookie("ITDC_UserName"));
            cookieContainer.Add(address, GetCookie("ITDC_UserRole"));
            request.CookieContainer = cookieContainer;
            StringBuilder data = new StringBuilder();
            for (int i = 0; i < Request.QueryString.Count; i++)
            {
                if (Request.QueryString.Keys[i].ToString() == "url") continue;
                data.Append("&" + Request.QueryString.Keys[i].ToString() + "=" + Request.QueryString[i].ToString());
            }
            // Create a byte array of the data we want to send
            byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString().TrimStart('&'));
            // Set the content length in the request headers
            request.ContentLength = byteData.Length;
            // Write data
            using (Stream postStream = request.GetRequestStream())
            {
                postStream.Write(byteData, 0, byteData.Length);
            }
            string result = "";
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                result = reader.ReadToEnd();
            }
            log.Info(CookieHelper.GetCookie("ITDC_UserName") + " 執(zhí)行完成 CommonPost Url=" + url);
            return (result);
        }

前臺(tái)調(diào)用

復(fù)制代碼代碼如下:

Ext.Ajax.request({url: APIUrl + '/Nebula/CommonPost?url=/Nebula/PostComment/&KlId=1&Msg=ok&Author=admin&Title=文章標(biāo)題',
                  method: "POST",
                  success: function (response) {
                              Ext.Viewport.unmask();
                              var obj = Ext.decode(response.responseText);
                              Ext.Msg.alert("提示", obj.Msg, Ext.emptyFn);
                           },
                  failure: function (response) {
                              Ext.Viewport.unmask();
                              Ext.Msg.alert("提示", "操作失敗，請(qǐng)檢查網(wǎng)絡(luò)！", Ext.emptyFn);
                           }
});