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我正在尝试建立与服务器的连接，该服务器为我的所有请求以及正常的 html 响应发送 401 身份验证错误。例如，但是，我还想阅读随同发送的 HTML 响应，以便我可以解析它。使用 LiveHTTPHeaders 捕获的示例标头交换：显然，内容长度非零。Firefox 显示它是 javascript。

https://172.31.1.251:1003/fgtauth?73e285357b2dc5cc
Request:
GET /fgtauth?73e285357b2dc5cc HTTP/1.1
Host: 172.31.1.251:1003
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.5b4 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

Response:
HTTP/1.x 401 Unauthorized
WWW-Authenticate: Fortigate
Content-Length: 1091
Connection: Keep-Alive
Cache-Control: no-cache
Content-Type: text/html

此时，Firefox 中会打开一个表单，要求我输入用户名和密码。

https://172.31.1.251:1003/

Request:
POST / HTTP/1.1
Host: 172.31.1.251:1003
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.5b4 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: https://172.31.1.251:1003/
Content-Type: application/x-www-form-urlencoded
Content-Length: 93
magic=73e285357b2dc5cc&username=uuxx&password=xxuu&4Tredir=http%3A%2F%2Fwww.google.com%2F


Response:
HTTP/1.x 401 Unauthorized
WWW-Authenticate: Fortigate
Content-Length: 924
Connection: Keep-Alive
Cache-Control: no-cache
Content-Type: text/html

此时我被重定向到另一个 URL。但是，我遇到的问题是如何获取与 401 Unauthorized 一起发送的长度为 924 的内容，因为该内容将帮助我做我想做的事情。但最重要的是：

WebResponse loginResponse = loginRequest.GetResponse();

抛出异常。

如果有任何建议可以帮助我了解实际内容，我将不胜感激。

谢谢。

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1 回答 1

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您需要阅读WebException'Response属性，如下所示：

WebResponse loginResponse;
try {
    loginResponse = loginRequest.GetResponse();
} catch(WebException ex) {
    if (ex.Status == WebExceptionStatus.ProtocolError) {
        loginResponse = ex.Response;
    } else
        throw;
}

//Do something with the response, and remember to dispose it.
于 2010-01-10T16:52:48.890 回答