在asp.net中转发请求(转发请求)

Question

我有一个Web应用程序,它在两个不同的Web应用程序之间进行通信(一个接收者和一个发送者,发送者与我的应用程序通信,我的应用程序与两者通信).

常规方案是发件人向我的应用程序发送HttpRequest,然后我在HttpHandler中收到它.这反过来将HttpContext发送到一些businesslogic来做一些管道.

在我的业务类完成存储数据(一些日志记录等)后,我想将所有头,表单数据等的相同请求中继到接收器应用程序.这必须从类发送,而不是HttpHandler.

问题是 - 我如何获取HttpContext对象,转发/转发完全相同的请求,只修改从http://myserver.com/到http://receiver.com的URL .

优选的c#中的任何代码示例都会很棒!

Answer 1

我有一个扩展方法HttpResponseBase来将传入请求复制到传出请求.

用法:

    var externalRequest = (HttpWebRequest)WebRequest.Create("http://stackoverflow.com");
    this.Request.CopyTo(externalRequest);
    var externalResponse = (HttpWebResponse)externalRequest.GetResponse();

资源:

/// <summary>
/// Copies all headers and content (except the URL) from an incoming to an outgoing
/// request.
/// </summary>
/// <param name="source">The request to copy from</param>
/// <param name="destination">The request to copy to</param>
public static void CopyTo(this HttpRequestBase source, HttpWebRequest destination)
{
    destination.Method = source.HttpMethod;

    // Copy unrestricted headers (including cookies, if any)
    foreach (var headerKey in source.Headers.AllKeys)
    {
        switch (headerKey)
        {
            case "Connection":
            case "Content-Length":
            case "Date":
            case "Expect":
            case "Host":
            case "If-Modified-Since":
            case "Range":
            case "Transfer-Encoding":
            case "Proxy-Connection":
                // Let IIS handle these
                break;

            case "Accept":
            case "Content-Type":
            case "Referer":
            case "User-Agent":
                // Restricted - copied below
                break;

            default:
                destination.Headers[headerKey] = source.Headers[headerKey];
                break;
        }
    }

    // Copy restricted headers
    if (source.AcceptTypes.Any())
    {
        destination.Accept = string.Join(",", source.AcceptTypes);
    }
    destination.ContentType = source.ContentType;
    destination.Referer = source.UrlReferrer.AbsoluteUri;
    destination.UserAgent = source.UserAgent;

    // Copy content (if content body is allowed)
    if (source.HttpMethod != "GET"
        && source.HttpMethod != "HEAD"
        && source.ContentLength > 0)
    {
        var destinationStream = destination.GetRequestStream();
        source.InputStream.CopyTo(destinationStream);
        destinationStream.Close();
    }
}

Answer 2

实际上,这样的事情运作良好

HttpRequest original = context.Request;
HttpWebRequest newRequest = (HttpWebRequest)WebRequest.Create(newUrl);

newRequest .ContentType = original.ContentType;
newRequest .Method = original.HttpMethod;
newRequest .UserAgent = original.UserAgent;

byte[] originalStream = ReadToByteArray(original.InputStream, 1024);

Stream reqStream = newRequest .GetRequestStream();
reqStream.Write(originalStream, 0, originalStream.Length);
reqStream.Close();


newRequest .GetResponse();

编辑:ReadToByteArray方法只是从流中生成一个字节数组