问题描述
我正在尝试使用我的 HttpWebRequest 发送以下标头:
I'm trying to send to send the following header with my HttpWebRequest:
连接:保持活动
但是，标头永远不会发送.Fiddler2 显示，每当我在 Google Chrome 中请求页面时，都会发送标头.但是，我的应用程序出于某种原因拒绝发送此标头.
However, the header is never sent. Fiddler2 is showing that whenever I request the page in Google Chrome, the header is sent. However, my application refuses to send this header for some reason.
我已将 KeepAlive 属性设置为 true(默认情况下它是 true)，但标头仍未发送.
I have set the KeepAlive property to true (it's true by default anyway), yet the header still does not get sent.
我正在尝试使用多个 HttpWebRequest 发送此标头，但它们基本上都是这样的:
I am trying to send this header with multiple HttpWebRequests, but they all basically look like this:
HttpWebRequest logIn6 = (HttpWebRequest)WebRequest.Create(new Uri(responseFromLogIn5));
logIn6.CookieContainer = cookies;
logIn6.KeepAlive = true;
logIn6.Referer = "https://login.yahoo.com/config/login?.src=spt&.intl=us&.lang=en-US&.done=http://football.fantasysports.yahoo.com/";
logIn6.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.220 Safari/535.1";
logIn6.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
logIn6.Headers.Add("Accept-Encoding:gzip,deflate,sdch");
logIn6.Headers.Add("Accept-Language:en-US,en;q=0.8");
logIn6.Headers.Add("Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3");
logIn6.AllowAutoRedirect = false;
HttpWebResponse logIn6Response = (HttpWebResponse)logIn6.GetResponse();
string responseFromLogIn6 = logIn6Response.GetResponseHeader("Location");
cookies.Add(logIn6Response.Cookies);
logIn6Response.Close();
有人知道我必须做什么来确保发送此标头吗?
Does anyone know what I have to do to make sure this header is sent?
来自 Chrome 的 Fiddler2 Raw:
Fiddler2 Raw From Chrome:
GET xxx HTTP/1.1
Host: accounts.google.com
Connection: keep-alive
Referer: https://login.yahoo.com/config/login?.src=spt&.intl=us&.lang=en-US&.done=http://football.fantasysports.yahoo.com/
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.220 Safari/535.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: xxx
HTTP/1.1 302 Moved Temporarily
Set-Cookie: xxx
Set-Cookie: xxx
Location: xxx
Content-Type: text/html; charset=UTF-8
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Date: Sat, 17 Sep 2011 22:27:09 GMT
Expires: Sat, 17 Sep 2011 22:27:09 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Content-Length: 2176
Server: GSE
我的应用程序中的 Fiddler2 Raw:
Fiddler2 Raw From My Application:
GET xxx HTTP/1.1
Referer: https://login.yahoo.com/config/login?.src=spt&.intl=us&.lang=en-US&.done=http://football.fantasysports.yahoo.com/
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.220 Safari/535.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Host: accounts.google.com
HTTP/1.1 302 Moved Temporarily
Location: xxx
Content-Type: text/html; charset=UTF-8
Date: Sun, 18 Sep 2011 00:05:40 GMT
Expires: Sun, 18 Sep 2011 00:05:40 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Content-Length: 573
Server: GSE
我正在尝试让第二个 Fiddler2 原始信息看起来像第一个 Fiddler2 原始信息.
I'm trying to get the second Fiddler2 raw information to look like the first Fiddler2 raw information.
推荐答案
我也遇到了同样的问题:Connection: Keep-Alive header is not sent except the first request, and the server如果它丢失，我访问不会给我正确的响应.所以，这是我对这个问题的解决方法:
I've had the same issue: The Connection: Keep-Alive header is not sent except the first request, and the server I accessed won't give me the correct response if it is missing. So, here are my workarounds to this issue:
首先将 HttpWebRequest 实例的 ProtocolVersion 属性设置为 HttpVersion.Version10.除了 http 命令将变为 GET xxx HTTP/1.0 之外，它可以工作并且只使用公共 API.
First is set the ProtocolVersion property of HttpWebRequest instance to HttpVersion.Version10. Except the http command will become GET xxx HTTP/1.0, it works and uses only the public API.
第二种方式使用反射修改HttpWebRequest实例的内部属性ServicePoint.HttpBehaviour，如下:
The second way uses the reflection to modify the internal property ServicePoint.HttpBehaviour of HttpWebRequest instance, like this:
var req = (HttpWebRequest)WebRequest.Create(someUrl);
var sp = req.ServicePoint;
var prop = sp.GetType().GetProperty("HttpBehaviour",
BindingFlags.Instance | BindingFlags.NonPublic);
prop.SetValue(sp, (byte)0, null);
req.GetResponse().Close();
希望这会有所帮助.
这篇关于C# - 连接:在 HttpWebRequest 期间未发送 keep-alive 标头的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！