我收到以下异常：
服务器违反了协议。 Section=ResponseHeader Detail=CR后面必须跟LF
从这个问题：
我了解我需要将 useUnsafeHeaderParsing 设置为 True。
这是我的代码：
HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url);
WebResponse myResp = myReq.GetResponse(); //exception is thrown here
useUnsafeHeaderParsing 是 HttpWebRequestElement 类的一个属性。
如何将其集成到上述代码中？
【问题讨论】：
标签： c# c#-4.0 httpwebrequest httpwebresponse
您需要在 web.config 中的 <system.net> 部分中设置它，如下所示：
<system.net>
<settings>
<httpWebRequest useUnsafeHeaderParsing="true" />
</settings>
</system.net>
如果出于某种原因，您不想从配置中执行此操作，您可以通过以语法方式设置配置设置从代码中执行此操作。示例见this page。
【讨论】：
httpClient.PostAsync。我收到 ServerProtocolViolation 错误。我将useUnsafeHeaderParsing 设置为true。现在我得到 ArgumetOutOfRangeException：System.Net.Http.HttpResponseMessage..ctor(HttpStatusCode statusCode)
正如 Edwin 所指出的，您需要在 web.config 或 app.config 文件中设置 useUnsafeHeaderParsing 属性。如果您真的想在运行时动态更改该值，那么您将不得不求助于反射，因为该值隐藏在 System.Net.Configuration.SettingsSectionInternal 的实例中并且不可公开访问。
这里有一个代码示例（基于找到的信息 here）可以解决问题：
using System;
using System.Net;
using System.Net.Configuration;
using System.Reflection;
namespace UnsafeHeaderParsingSample
{
class Program
{
static void Main()
{
// Enable UseUnsafeHeaderParsing
if (!ToggleAllowUnsafeHeaderParsing(true))
{
// Couldn't set flag. Log the fact, throw an exception or whatever.
}
// This request will now allow unsafe header parsing, i.e. GetResponse won't throw an exception.
var request = (HttpWebRequest) WebRequest.Create("http://localhost:8000");
var response = request.GetResponse();
// Disable UseUnsafeHeaderParsing
if (!ToggleAllowUnsafeHeaderParsing(false))
{
// Couldn't change flag. Log the fact, throw an exception or whatever.
}
// This request won't allow unsafe header parsing, i.e. GetResponse will throw an exception.
var strictHeaderRequest = (HttpWebRequest)WebRequest.Create("http://localhost:8000");
var strictResponse = strictHeaderRequest.GetResponse();
}
// Enable/disable useUnsafeHeaderParsing.
// See http://o2platform.wordpress.com/2010/10/20/dealing-with-the-server-committed-a-protocol-violation-sectionresponsestatusline/
public static bool ToggleAllowUnsafeHeaderParsing(bool enable)
{
//Get the assembly that contains the internal class
Assembly assembly = Assembly.GetAssembly(typeof(SettingsSection));
if (assembly != null)
{
//Use the assembly in order to get the internal type for the internal class
Type settingsSectionType = assembly.GetType("System.Net.Configuration.SettingsSectionInternal");
if (settingsSectionType != null)
{
//Use the internal static property to get an instance of the internal settings class.
//If the static instance isn't created already invoking the property will create it for us.
object anInstance = settingsSectionType.InvokeMember("Section",
BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.NonPublic, null, null, new object[] { });
if (anInstance != null)
{
//Locate the private bool field that tells the framework if unsafe header parsing is allowed
FieldInfo aUseUnsafeHeaderParsing = settingsSectionType.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic | BindingFlags.Instance);
if (aUseUnsafeHeaderParsing != null)
{
aUseUnsafeHeaderParsing.SetValue(anInstance, enable);
return true;
}
}
}
}
return false;
}
}
}
【讨论】：
如果你不想使用反射，你可以试试这个代码（System.Configuration.dll 参考）：
using System.Configuration;
using System.Net.Configuration;
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = (SettingsSection)config.GetSection("system.net/settings");
settings.HttpWebRequest.UseUnsafeHeaderParsing = true;
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("system.net/settings");
【讨论】：