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HttpWebRequst中https的验证处理问题

2024-07-17 05:25:41   215人阅读

最近在公司项目中使用了HttpWebRequst相关API，运行环境为.Net/Mono 2.0，是一款针对Unity平台的工具。开发过程中碰到了大家可能都碰到过的问题，Http还是Https？ 为什么Http可以正常响应，Https就会失败，返回结果为authorize or decrypt failed.

by th way, .Net 4.0及以上版本好像已经没有这个问题了，巨硬默默把坑填了。

使用Http的写法：

public void Get(string Url){HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create (Url);webRequest.Method="GET";webRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36";webRequest.BeginGetResponse(GetResponseCallback,webRequest);}private void GetResponseCallback(IAsyncResult ar){//RequestState myRequestState = (RequestState)ar.AsyncState;HttpWebRequest webRequest = (HttpWebRequest)ar.AsyncState;try{WebResponse response = webRequest.EndGetResponse(ar);streamReader = new StreamReader(response.GetResponseStream ());}catch(Exception es){Debug.Log (es.Message);}if (GetDataCompleted != null) {GetDataCompleted(this,new GetDataCompletedArgs(streamReader.ReadToEnd ()));}}

这里使用了异步，同步的写法效果相同。

但是如果此时使用了Https的Url，结果会一直返回失败。这是为什么呢？原因是Https基于SSL/TLS协议，需要在请求之前进行证书验证，而我们上面的写法并没有进行相关的验证，所以导致通信失败。怎么解决此问题呢？很简单，我们在请求发出前进行验证，在.Net 2.0或更高版本，我们加入回调函数即可。

解决办法：

public void Get(string Url)        {            //SSL/TLS certificate method            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create (Url);            webRequest.Method="GET";            webRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36";            webRequest.BeginGetResponse(GetResponseCallback,webRequest);        }/// <summary>        /// SSL/TLS certificate callback method        /// Must return true        /// </summary>        /// <returns><c>true</c>, if validation result was checked, <c>false</c> otherwise.</returns>        /// <param name="sender">Sender.</param>        /// <param name="certificate">Certificate.</param>        /// <param name="chain">Chain.</param>        /// <param name="sslPolicyErrors">Ssl policy errors.</param>        public bool CheckValidationResult (object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, SslPolicyErrors sslPolicyErrors)        {            //Debug.LogWarning (certificate.GetSerialNumberString ());            return true;        }        /// <summary>        /// Gets the response callback.        /// </summary>        /// <param name="ar">Ar.</param>        private void GetResponseCallback(IAsyncResult ar)        {            //RequestState myRequestState = (RequestState)ar.AsyncState;            HttpWebRequest webRequest = (HttpWebRequest)ar.AsyncState;            try{                WebResponse response = webRequest.EndGetResponse(ar);                streamReader = new StreamReader(response.GetResponseStream ());            }            catch(Exception es)            {                Debug.Log (es.Message);            }            if (GetDataCompleted != null) {                GetDataCompleted(this,new GetDataCompletedArgs(streamReader.ReadToEnd ()));            }        }

 

至此就可以，解决此问题，这类问题说大不大，说小不小，属于我们开发中遇到的小坑之一，.Net4.0以上版本不需注意此问题。

关于更低的.Net 1.1的写法，大家可以去看一下博客，本篇博文也是参照他的解决方案：

http://blog.sina.com.cn/s/blog_4ae95c270101qnn1.html

　　

 


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