获取 StatusCode 401 的响应内容

Question

我正在尝试建立到服务器的连接，该服务器为我的所有请求发送 401 身份验证错误以及正常的 html 响应。例如 不过，我还想读取随之发送的 HTML 响应，以便我可以对其进行解析。使用 LiveHTTPHeaders 捕获的标头交换示例： 显然，内容长度不为零。 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。然而，我遇到的问题是如何获取与 401 Unauthorized 一起发送的长度 924 的内容，因为该内容将帮助我进一步做我想做的事情。但就这一行：

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。

Answer 1

您需要读取 WebException 的 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.