HttpListener-如何发送WebException HTTP 304“未修改”错误返回浏览器？ [英] HttpListener - how do I send a WebException HTTP 304 "Not Modified" error back to browser?

问题描述

如果我使用HttpListener，如何将WebException 304错误模拟回浏览器？

How do I mimic a WebException 304 error back to browser if I am using HttpListener?

那是我已经收到对HttpListener的请求，然后获得了HttpListenerContext，从这一点出发，我如何模仿/安排HTTP 304 Not Modified响应，以便通过HttpListenerContext.response有效地发送回浏览器？

That is I have received a request to my HttpListener, and then obtained the HttpListenerContext, then from this point how would I mimic/arrange for a HTTP "304 Not Modified" response to be effectively sent back to the browser via the HttpListenerContext.response?

编辑：

我尝试了以下操作，但是在将WebException.Status复制到HttpWebResponse时遇到错误。 StatusCode（状态码必须为三位数）。有关如何纠正此问题的任何想法？

I tried the following however I get an error trying to copy WebException.Status to HttpWebResponse.StatusCode (The status code must be exactly three digits). Any ideas on how to correct this?

    catch (WebException ex)
    {
        listenerContext.Response.StatusCode = (int)ex.Status;   //ERROR: The status code must be exactly three digits
        listenerContext.Response.StatusDescription = ex.Message;
        listenerContext.Response.Close();

谢谢

推荐答案

我认为我有：

    catch (WebException ex)
    {


        if (ex.Status == WebExceptionStatus.ProtocolError)
        {
            int statusCode = (int) ((HttpWebResponse) ex.Response).StatusCode;
            listenerContext.Response.StatusCode = statusCode;
            listenerContext.Response.StatusDescription = ex.Message;
            log("WARNING", uri, "WebException/ProtocolError: " + ex.GetType() + " - " + ex.Message);
        }
        else
        {
            log("ERROR", uri, "WebException - " + ex.GetType() + " - " + ex.Message);

        }

        listenerContext.Response.Close();
    }

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