HttpWebRequestElement.UseUnsafeHeaderParsing Property
异常信息
System.Net.WebException:“服务器提交了协议冲突. Section=ResponseHeader Detail=CR 后面必须是 LF”
解决办法
一、通过配置文件实现
web.config或app.config中设置如下属性
<system.net>
<settings>
<httpWebRequest useUnsafeHeaderParsing="true" />
</settings>
</system.net>
二、通过代码实现
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Configuration;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace UnsafeHeaderParsingSample
{
internal class Program
{
private 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;
}
}
}
