关于 服务器提交了协议冲突. Section=ResponseHeader Detail=CR 后面必须是 LF 错误

用WebClient 去下载数据时发现有服务器提交了协议冲突. Section=ResponseHeader Detail=CR 后面必须是 LF错误，解决办法

1.在app.config种添加 web 在 web.config种添加

 <system.net>

    <settings>

      <httpWebRequest useUnsafeHeaderParsing="true" />

    </settings>

  </system.net>

 

2.以反射的形式在程序中设定useUnsafeHeaderParsing的值【该方法须在发送请求之前进行设定否则无效果】

public static bool SetAllowUnsafeHeaderParsing(bool useUnsafe)
        {
            //Get the assembly that contains the internal class
            System.Reflection.Assembly aNetAssembly = System.Reflection.Assembly.GetAssembly(typeof(System.Net.Configuration.SettingsSection));
            if (aNetAssembly != null)
            {
                //Use the assembly in order to get the internal type for the internal class
                Type aSettingsType = aNetAssembly.GetType("System.Net.Configuration.SettingsSectionInternal");
                if (aSettingsType != null)
                {
                    //Use the internal static property to get an instance of the internal settings class.
                    //If the static instance isn't created allready the property will create it for us.
                    object anInstance = aSettingsType.InvokeMember("Section",
                      System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.NonPublic, null, null, new object[] { });

                    if (anInstance != null)
                    {
                        //Locate the private bool field that tells the framework is unsafe header parsing should be allowed or not
                        System.Reflection.FieldInfo aUseUnsafeHeaderParsing = aSettingsType.GetField("useUnsafeHeaderParsing", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                        if (aUseUnsafeHeaderParsing != null)
                        {
                            aUseUnsafeHeaderParsing.SetValue(anInstance, useUnsafe);
                            return true;
                        }
                    }
                }
            }
            return false;
        }

以上摘抄于http://www.cnblogs.com/lewisli/p/6775010.html