C# 实现 HTTP 请求代理以解决 JS 跨域问题

C# 实现 HTTP 请求代理以解决 JS 跨域问题

以下代码展示了如何通过一般处理程序作为代理，由 JavaScript 发起调用以解决跨域问题。若业务场景中涉及频繁的跨域交互，建议采用此方案。

public string GetInfo(HttpContext context)
{ 
string post = "a=XX&b=XX";
return CreateHttpRequest("https://www.XXXX.com", post, "POST");
} 
#region 构造请求
/// <summary>
/// 构造请求
/// </summary>
/// <param name="requestUrl">请求地址</param>
/// <param name="requestParam">请求参数</param>
/// <param name="requestMethod">请求方式</param>
/// <returns></returns>
public string CreateHttpRequest(string requestUrl, string requestParam, string requestMethod)
{ 
try
{ 
System.Net.HttpWebRequest request = System.Net.HttpWebRequest.Create(requestUrl) as System.Net.HttpWebRequest;
request.Method = requestMethod;
string post = requestParam;
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(post);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = bytes.Length;
System.IO.Stream stream = request.GetRequestStream();
stream.Write(bytes, 0, bytes.Length);
System.Net.HttpWebResponse response = request.GetResponse() as System.Net.HttpWebResponse;
System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
return sr.ReadToEnd();
} 
catch (Exception)
{ 
return "";
} 
} 
#endregion