ResponseStatusLine protocol violation
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by Tom Hines
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Published on Fri, 03 Dec 2010 17:10:21 GMT
Indexed on
2010/12/06
16:57 UTC
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I parse/scrape a few web page every now and then and recently ran across an error that stated:
"The server committed a protocol violation. Section=ResponseStatusLine".
After a few web searches, I found a couple of suggestions – one of which said the problem could be fixed by changing the HttpWebRequest ProtocolVersion to 1.0 with the command:
1: HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strURI);
2: req.ProtocolVersion = HttpVersion.Version10;
…but that did not work in my particular case.
What DID work was the next suggestion I found that suggested the use of the setting: “useUnsafeHeaderParsing” either in the app.config file or programmatically.
If added to the app.config, it would be:
1: <!-- after the applicationSettings -->
2: <system.net>
3: <settings>
4: <httpWebRequest useUnsafeHeaderParsing ="true"/>
5: </settings>
6: </system.net>
If done programmatically, it would look like this:
C++:
1: // UUHP_CPP.h
2: #pragma once
3: using namespace System;
4: using namespace System::Reflection;
5:
6: namespace UUHP_CPP
7: {
8: public ref class CUUHP_CPP
9: {
10: public:
11: static bool UseUnsafeHeaderParsing(String^% strError)
12: {
13: Assembly^ assembly = Assembly::GetAssembly(System::Net::Configuration::SettingsSection::typeid); //__typeof
14: if (nullptr==assembly)
15: {
16: strError = "Could not access Assembly";
17: return false;
18: }
19:
20: Type^ type = assembly->GetType("System.Net.Configuration.SettingsSectionInternal");
21: if (nullptr==type)
22: {
23: strError = "Could not access internal settings";
24: return false;
25: }
26:
27: Object^ obj = type->InvokeMember("Section",
28: BindingFlags::Static | BindingFlags::GetProperty | BindingFlags::NonPublic,
29: nullptr, nullptr, gcnew array<Object^,1>(0));
30:
31: if(nullptr == obj)
32: {
33: strError = "Could not invoke Section member";
34: return false;
35: }
36:
37: FieldInfo^ fi = type->GetField("useUnsafeHeaderParsing", BindingFlags::NonPublic | BindingFlags::Instance);
38: if(nullptr == fi)
39: {
40: strError = "Could not access useUnsafeHeaderParsing field";
41: return false;
42: }
43:
44: if (!(bool)fi->GetValue(obj))
45: {
46: fi->SetValue(obj, true);
47: }
48:
49: return true;
50: }
51: };
52: }
C# (CSharp):
1: using System;
2: using System.Reflection;
3:
4: namespace UUHP_CS
5: {
6: public class CUUHP_CS
7: {
8: public static bool UseUnsafeHeaderParsing(ref string strError)
9: {
10: Assembly assembly = Assembly.GetAssembly(typeof(System.Net.Configuration.SettingsSection));
11: if (null == assembly)
12: {
13: strError = "Could not access Assembly";
14: return false;
15: }
16:
17: Type type = assembly.GetType("System.Net.Configuration.SettingsSectionInternal");
18: if (null == type)
19: {
20: strError = "Could not access internal settings";
21: return false;
22: }
23:
24: object obj = type.InvokeMember("Section",
25: BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.NonPublic,
26: null, null, new object[] { });
27:
28: if (null == obj)
29: {
30: strError = "Could not invoke Section member";
31: return false;
32: }
33:
34: // If it's not already set, set it.
35: FieldInfo fi = type.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic | BindingFlags.Instance);
36: if (null == fi)
37: {
38: strError = "Could not access useUnsafeHeaderParsing field";
39: return false;
40: }
41:
42: if (!Convert.ToBoolean(fi.GetValue(obj)))
43: {
44: fi.SetValue(obj, true);
45: }
46:
47: return true;
48: }
49: }
50: }
F# (FSharp):
1: namespace UUHP_FS
2: open System
3: open System.Reflection
4: module CUUHP_FS =
5: let UseUnsafeHeaderParsing(strError : byref<string>) : bool =
6: //
7: let assembly : Assembly = Assembly.GetAssembly(typeof<System.Net.Configuration.SettingsSection>)
8: if (null = assembly) then
9: strError <- "Could not access Assembly"
10: false
11: else
12:
13: let myType : Type = assembly.GetType("System.Net.Configuration.SettingsSectionInternal")
14: if (null = myType) then
15: strError <- "Could not access internal settings"
16: false
17: else
18:
19: let obj : Object = myType.InvokeMember("Section", BindingFlags.Static ||| BindingFlags.GetProperty ||| BindingFlags.NonPublic, null, null, Array.zeroCreate 0)
20: if (null = obj) then
21: strError <- "Could not invoke Section member"
22: false
23: else
24:
25: // If it's not already set, set it.
26: let fi : FieldInfo = myType.GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic ||| BindingFlags.Instance)
27: if(null = fi) then
28: strError <- "Could not access useUnsafeHeaderParsing field"
29: false
30: else
31:
32: if (not(Convert.ToBoolean(fi.GetValue(obj)))) then
33: fi.SetValue(obj, true)
34:
35: // Now return true
36: true
VB (Visual Basic):
1: Option Explicit On
2: Option Strict On
3: Imports System
4: Imports System.Reflection
5:
6: Public Class CUUHP_VB
7: Public Shared Function UseUnsafeHeaderParsing(ByRef strError As String) As Boolean
8:
9: Dim assembly As [Assembly]
10: assembly = [assembly].GetAssembly(GetType(System.Net.Configuration.SettingsSection))
11:
12: If (assembly Is Nothing) Then
13: strError = "Could not access Assembly"
14: Return False
15: End If
16:
17: Dim type As Type
18: type = [assembly].GetType("System.Net.Configuration.SettingsSectionInternal")
19: If (type Is Nothing) Then
20: strError = "Could not access internal settings"
21: Return False
22: End If
23:
24: Dim obj As Object
25: obj = [type].InvokeMember("Section", _
26: BindingFlags.Static Or BindingFlags.GetProperty Or BindingFlags.NonPublic, _
27: Nothing, Nothing, New [Object]() {})
28:
29: If (obj Is Nothing) Then
30: strError = "Could not invoke Section member"
31: Return False
32: End If
33:
34: ' If it's not already set, set it.
35: Dim fi As FieldInfo
36: fi = [type].GetField("useUnsafeHeaderParsing", BindingFlags.NonPublic Or BindingFlags.Instance)
37: If (fi Is Nothing) Then
38: strError = "Could not access useUnsafeHeaderParsing field"
39: Return False
40: End If
41:
42: If (Not Convert.ToBoolean(fi.GetValue(obj))) Then
43: fi.SetValue(obj, True)
44: End If
45:
46: Return True
47: End Function
48: End Class
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