HttpWebRequest and the POST method from a win form app

[Rachet?]

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebRequest httpReq =
(HttpWebRequest )WebRequest.Cre ate(myaspPageUR L)
httpReq.Content Type =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebResponse httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(ht tpResp.GetRespo nseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[John Timney \(Microsoft MVP\)]

Compare your example to this one and see if you can spot the problem.

http://samples.gotdotnet.com/quickst...=/quickstart/h
owto/samples/net/WebRequests/clientPOST.src

--
Regards

John Timney
Microsoft Regional Director
Microsoft MVP

"Rachet?" <be********@yah oo.com> wrote in message
news:48******** *************** ***@posting.goo gle.com...

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebRequest httpReq =
(HttpWebRequest )WebRequest.Cre ate(myaspPageUR L)
httpReq.Content Type =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebResponse httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(ht tpResp.GetRespo nseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[bruce barker]

you have to url encode the values

strPost += ("&" +names[i]+"=" + HttpUtility.Url Encode(values[i]));

-- bruce (sqlwork.com)

"Rachet?" <be********@yah oo.com> wrote in message
news:48******** *************** ***@posting.goo gle.com...

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebRequest httpReq =
(HttpWebRequest )WebRequest.Cre ate(myaspPageUR L)
httpReq.Content Type =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebResponse httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(ht tpResp.GetRespo nseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[Scott Allen]

Be careful to UrlEncode the values before you post.

One tool I've found really useful for debugging these sorts of
problems is Fiddler. You can compare what your code sends to the
server with what IE sends to the server and spot the difference.

http://www.bayden.com/Fiddler/help/

--
Scott
http://www.OdeToCode.com

On 14 Jul 2004 13:38:59 -0700, be********@yaho o.com (Rachet?) wrote:

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebReque st httpReq =
(HttpWebReques t)WebRequest.Cr eate(myaspPageU RL)
httpReq.Conten tType =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebRespons e httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(h ttpResp.GetResp onseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[Rachete]

John,
I tried to use the sample and also the suggestions by the Bruce and scott. I continue to get the error:
System.Net.WebE xception: The remote server returned an error: (400) Bad Request.
at System.Net.Http WebRequest.Chec kFinalStatus()
at System.Net.Http WebRequest.EndG etResponse(IAsy ncResult asyncResult)
at System.Net.Http WebRequest.GetR esponse()
....


"John Timney (Microsoft MVP)" wrote:

Compare your example to this one and see if you can spot the problem.

http://samples.gotdotnet.com/quickst...=/quickstart/h
owto/samples/net/WebRequests/clientPOST.src

--
Regards

John Timney
Microsoft Regional Director
Microsoft MVP

"Rachet?" <be********@yah oo.com> wrote in message
news:48******** *************** ***@posting.goo gle.com...

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebRequest httpReq =
(HttpWebRequest )WebRequest.Cre ate(myaspPageUR L)
httpReq.Content Type =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebResponse httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(ht tpResp.GetRespo nseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[Rachete]

Thank you so much again. That tool is fabulous. I was able to pinpoint the problem using it. The problem I had was that the requested page had a redirection and I needed to do a manual redirection. Therefore, I just set the autoredirect property to false and handle the redirection later.

"Scott Allen" wrote:

Be careful to UrlEncode the values before you post.

One tool I've found really useful for debugging these sorts of
problems is Fiddler. You can compare what your code sends to the
server with what IE sends to the server and spot the difference.

http://www.bayden.com/Fiddler/help/

--
Scott
http://www.OdeToCode.com

On 14 Jul 2004 13:38:59 -0700, be********@yaho o.com (Rachet?) wrote:

I am getting a "The remote server returned an error: (400) Bad
Request." error while trying to send data to an asp page. The puzzle
is, if I paste the string I want to send on a browser address box, it
just go fine. From the win form app also it go fine until I happen to
send an xml formatted string as a value. But same go fine through the
browser.

Any help is greatly appreciated.

My code looks like:

string responseString = null;
string strPost=names[0]+"=" + values[0];

for(int i=1;i<values.Le ngth;i++)
{
strPost += ("&" +names[i]+"=" + values[i]);
}

byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );

HttpWebReque st httpReq =
(HttpWebReques t)WebRequest.Cr eate(myaspPageU RL)
httpReq.Conten tType =
"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
httpReq.KeepAli ve = true;
httpReq.UserAge nt = null;
httpReq.Content Length = encodedRequest. Length;
httpReq.Method = "POST";

try
{
using (Stream requestStream = httpReq.GetRequ estStream())
{
requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
requestStream.C lose();
}
}

catch ( Exception ex )
{
return "Error in request : " +ex.Message;
}

try
{

HttpWebRespons e httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
using (StreamReader sr = new
StreamReader(h ttpResp.GetResp onseStream()) )
{
do
{
responseString = sr.ReadToEnd();
}while(response String=="");
sr.Close();
}
httpResp.Close ();
/return the response
return responseString;
}
catch ( Exception ex1 )
{
//status=httpResp .StatusDescript ion ;
return "Error in response : " +ex1.Message ;
}
}

[Scott Allen]

That's great. Glad you have it working.

--s

On Fri, 16 Jul 2004 04:37:02 -0700, "Rachete"
<Ra*****@discus sions.microsoft .com> wrote:

Thank you so much again. That tool is fabulous. I was able to pinpoint the problem using it. The problem I had was that the requested page had a redirection and I needed to do a manual redirection. Therefore, I just set the autoredirect property to false and handle the redirection later.

"Scott Allen" wrote:

Be careful to UrlEncode the values before you post.

One tool I've found really useful for debugging these sorts of
problems is Fiddler. You can compare what your code sends to the
server with what IE sends to the server and spot the difference.

http://www.bayden.com/Fiddler/help/

--
Scott
http://www.OdeToCode.com

On 14 Jul 2004 13:38:59 -0700, be********@yaho o.com (Rachet?) wrote:

>I am getting a "The remote server returned an error: (400) Bad
>Request." error while trying to send data to an asp page. The puzzle
>is, if I paste the string I want to send on a browser address box, it
>just go fine. From the win form app also it go fine until I happen to
>send an xml formatted string as a value. But same go fine through the
>browser.
>
>Any help is greatly appreciated.
>
>My code looks like:
>
>string responseString = null;
> string strPost=names[0]+"=" + values[0];
>
> for(int i=1;i<values.Le ngth;i++)
> {
> strPost += ("&" +names[i]+"=" + values[i]);
> }
>
>byte[] encodedRequest = Encoding.UTF8.G etBytes(strPost );
>
>HttpWebReque st httpReq =
>(HttpWebReques t)WebRequest.Cr eate(myaspPageU RL)
>httpReq.Conten tType =
>"applicatio n/x-www-form-urlencoded"; httpReq.Timeout = 10000;
> httpReq.KeepAli ve = true;
> httpReq.UserAge nt = null;
> httpReq.Content Length = encodedRequest. Length;
> httpReq.Method = "POST";
>
> try
> {
> using (Stream requestStream = httpReq.GetRequ estStream())
> {
> requestStream.W rite(encodedReq uest, 0, encodedRequest. Length);
> requestStream.C lose();
> }
> }
>
>catch ( Exception ex )
>{
>return "Error in request : " +ex.Message;
>}
>
>try
>{
>
>HttpWebRespons e httpResp = (HttpWebRespons e)httpReq.GetRe sponse();
>using (StreamReader sr = new
>StreamReader(h ttpResp.GetResp onseStream()) )
>{
> do
> {
> responseString = sr.ReadToEnd();
> }while(response String=="");
> sr.Close();
>}
> httpResp.Close ();
> /return the response
> return responseString;
>}
>catch ( Exception ex1 )
> {
> //status=httpResp .StatusDescript ion ;
> return "Error in response : " +ex1.Message ;
> }
>}

--
Scott
http://www.OdeToCode.com