Accessing a URI programmaticall y

[Helen]

Hi,
I am trying to write an ASP.Net application that
integrates with a third party application via their fairly
simplistic web component, however I am having problems
with the URI.

The URI works fine in Internet Explorer, and returns the
information from the third party application to the
browser, which is displayed, no problems.

However, when I try to do this programmaticall y, using the
System.Net.WebC lient class OpenRead, or the System.Net.
HTTPWebRequest class GetResponse, I get the following Web
Exception:

WebException: The underlying connection was closed: The
server committed an HTTP protocol violation.]
System.Net.Http WebRequest.Chec kFinalStatus()
System.Net.Http WebRequest.EndG etResponse(IAsy ncResult
asyncResult)
System.Net.Http WebRequest.GetR esponse()
WebRequestProto .Client.Button1 _Click(Object sender,
EventArgs e) in
c:\inetpub\wwwr oot\flare\flare citycouncil\fla redirect\clien
t.aspx.cs:114
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)

System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEve
ntHandler.Raise PostBackEvent(S tring eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent
(IPostBackEvent Handler sourceControl, String eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent
(NameValueColle ction postData)
System.Web.UI.P age.ProcessRequ estMain()
Can anyone tell me what these HTTP client classes do
differently from Internet Explorer, which is perfectly
happy with the URI? and how I can find out what the
protocol violation is?

Thanks

Helen

[Ken Cox [Microsoft MVP]]

Hi Helen,

Is it possible that your code isn't passing the method the complete URI?

Maybe you need to set the WebClient.BaseA ddress property down to the page?
There's a sample here that shows what I mean:

http://msdn.microsoft.com/library/de...dressTopic.asp
"Helen" <sc************ ******@nospam.c om> wrote in message
news:00******** *************** *****@phx.gbl.. .

Hi,
I am trying to write an ASP.Net application that
integrates with a third party application via their fairly
simplistic web component, however I am having problems
with the URI.

The URI works fine in Internet Explorer, and returns the
information from the third party application to the
browser, which is displayed, no problems.

However, when I try to do this programmaticall y, using the
System.Net.WebC lient class OpenRead, or the System.Net.
HTTPWebRequest class GetResponse, I get the following Web
Exception:

WebException: The underlying connection was closed: The
server committed an HTTP protocol violation.]
System.Net.Http WebRequest.Chec kFinalStatus()
System.Net.Http WebRequest.EndG etResponse(IAsy ncResult
asyncResult)
System.Net.Http WebRequest.GetR esponse()
WebRequestProto .Client.Button1 _Click(Object sender,
EventArgs e) in
c:\inetpub\wwwr oot\flare\flare citycouncil\fla redirect\clien
t.aspx.cs:114
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)

System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEve
ntHandler.Raise PostBackEvent(S tring eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent
(IPostBackEvent Handler sourceControl, String eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent
(NameValueColle ction postData)
System.Web.UI.P age.ProcessRequ estMain()
Can anyone tell me what these HTTP client classes do
differently from Internet Explorer, which is perfectly
happy with the URI? and how I can find out what the
protocol violation is?

Thanks

Helen

[Yan-Hong Huang[MSFT]]

Hello Helen,

Thanks for posting in the group.

Based on my understanding, now the question is: How to use .NET framework
class to get HTTP response in ASP.NET programming? If I have misunderstood
the problem, please feel free to post here.

About how to do it in ASP.NET, please refer to the following code sample:
[C#]
string sBuffer;
WebResponse objResponse;
WebRequest objRequest =
System.Net.Http WebRequest.Crea te("www.microso ft.com");
objResponse = objRequest.GetR esponse();
StreamReader sr = new
StreamReader(ob jResponse.GetRe sponseStream(), System.Text.Enc oding.Default);
sBuffer = sr.ReadToEnd();
sr.Close();

Could you please test the above code and let me know if it works? I suggest
you test it for a simple page first.

Does that answer your question?

Best regards,
Yanhong Huang
Microsoft Online Partner Support

Get Secure! ¨C www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[Helen]

Hi Huang,
Your code works fine if I access a simple web page that I
wrote, but I am still getting the same problem when I link
to the URL that I'm trying to access.

Here is my new code:

System.Net.WebR esponse objResponse;
System.Net.Http WebRequest myReq =(HttpWebReques t)
System.Net.Http WebRequest.Crea te(this.TextBox 3.Text);

objResponse = myReq.GetRespon se();

At this point it crashes with the original error message.

I suspect that the other application I'm trying to access
is causing the Server Protocol Violation, but I need to
find out what it is doing that the HTTPWebRequest is
objecting to, since Internet Explorer seems to be
perfectly happy with the URL.

Thanks ..

Helen

-----Original Message-----
Hello Helen,

Thanks for posting in the group.

Based on my understanding, now the question is: How to use .NET framework class to get HTTP response in ASP.NET programming? If I have misunderstood the problem, please feel free to post here.

About how to do it in ASP.NET, please refer to the following code sample:[C#]
string sBuffer;
WebResponse objResponse;
WebRequest objRequest =
System.Net.Htt pWebRequest.Cre ate("www.micros oft.com");
objResponse = objRequest.GetR esponse();
StreamReader sr = new
StreamReader(o bjResponse.GetR esponseStream (),System.Text. Encoding.Defaul t); sBuffer = sr.ReadToEnd();
sr.Close();

Could you please test the above code and let me know if it works? I suggest you test it for a simple page first.

Does that answer your question?

Best regards,
Yanhong Huang
Microsoft Online Partner Support

Get Secure! ¨C www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.
.

Hi Ken,

I have tried setting the baseaddress explicitly, though
the OpenRead method takes the whole address anyway.

Also, this code works fine if I access a test page I wrote
myself, it is only causing a problem when I access the
application I'm trying to integrate to, unfortunately!

Here is my code.

System.Net.WebC lient objClient = new System.Net.WebC lient
();
objClient.BaseA ddress = "http://2k3btest/CGI-Bin/nph-
srep.exe?SCHPAG E=c:/inetpub/wwwroot/cgi-
bin/pennies.sch&Gro up=U&Name=penni es";

Stream stResponse = objClient.OpenR ead
("http://2k3btest/CGI-Bin/nph-srep.exe?
SCHPAGE=c:/inetpub/wwwroot/cgi-
bin/pennies.sch&Gro up=U&Name=penni es");

At this point it crashes with the WebException : The
Server Committed an HTTP Protocol Violation.

I'm guessing that the other application is somehow
violating HTTP, but Internet Explorer is quite happy with
the URL, and returns the data I need in my asp.net
appication.

Any other ideas how I can find out what the problem is?

Thanks

Helen

-----Original Message-----
Hi Helen,

Is it possible that your code isn't passing the method the complete URI?
Maybe you need to set the WebClient.BaseA ddress property down to the page?There's a sample here that shows what I mean:

http://msdn.microsoft.com/library/default.asp? url=/library/en-
us/cpref/html/frlrfSystemNetW ebClientClassBa seAddressTopic.
asp

"Helen" <sc************ ******@nospam.c om> wrote in message
news:00******* *************** ******@phx.gbl. ..

Hi,
I am trying to write an ASP.Net application that
integrates with a third party application via their fairly simplistic web component, however I am having problems
with the URI.

The URI works fine in Internet Explorer, and returns the
information from the third party application to the
browser, which is displayed, no problems.

However, when I try to do this programmaticall y, using the System.Net.WebC lient class OpenRead, or the System.Net.
HTTPWebRequest class GetResponse, I get the following Web Exception:

WebException: The underlying connection was closed: The
server committed an HTTP protocol violation.]
System.Net.Http WebRequest.Chec kFinalStatus()
System.Net.Http WebRequest.EndG etResponse(IAsy ncResult
asyncResult)
System.Net.Http WebRequest.GetR esponse()
WebRequestProto .Client.Button1 _Click(Object sender,
EventArgs e) in
c:\inetpub\wwwr oot\flare\flare citycouncil\fla redirect\clien t.aspx.cs:114
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)

System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEve ntHandler.Raise PostBackEvent(S tring eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent
(IPostBackEvent Handler sourceControl, String eventArgument) System.Web.UI.P age.RaisePostBa ckEvent
(NameValueColle ction postData)
System.Web.UI.P age.ProcessRequ estMain()
Can anyone tell me what these HTTP client classes do
differently from Internet Explorer, which is perfectly
happy with the URI? and how I can find out what the
protocol violation is?

Thanks

Helen

.

[Yan-Hong Huang[MSFT]]

Hi Helen,

Thanks for the quick response.

I understand the problem is quite annoying. Based on my experience, it is
better for us to simply that page step by step to isolate the problem. IE
is smart enough to determine what to do under different situations, such as
proxy involved, authentication needed, and etc.

To dig into the root cause, we may need to use Network Monitor to catch
network packets to see what happens in the low level. It needs more time.
However, it is very straightford and quite useful under some situations.

If you have any more concerns, please feel free to post here.

Best regards,
Yanhong Huang
Microsoft Community Support

Get Secure! ¨C www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.