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WebException when trying to retrieve HTML created from another ASPX page.

Posted on 2008-10-28
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Last Modified: 2013-12-17
Hi,

I am receiving a WebException when I post and retrieve HTML from an ASPX Page.
The page is responsible for creating a branded email:

  http://www.hesgroup.com.au/email/emailtemplate.aspx

The following fields are posted to it:

            string toName = string.IsNullOrEmpty(Request.Form["toName"]) ? String.Empty : Server.UrlDecode(Request.Form["toName"]);
            string toEmail = string.IsNullOrEmpty(Request.Form["toEmail"]) ? String.Empty : Server.UrlDecode(Request.Form["toEmail"]);
            string fromName = string.IsNullOrEmpty(Request.Form["fromName"]) ? String.Empty : Server.UrlDecode(Request.Form["fromName"]);
            string fromEmail = string.IsNullOrEmpty(Request.Form["fromEmail"]) ? String.Empty : Server.UrlDecode(Request.Form["fromEmail"]);
            string subject = string.IsNullOrEmpty(Request.Form["subject"]) ? String.Empty : Server.UrlDecode(Request.Form["subject"]);
            string message = string.IsNullOrEmpty(Request.Form["message"]) ? String.Empty : Server.UrlDecode(Request.Form["message"]);


The error being returned is a 500 server error and does not help me in anyway debug.
I am also retrieving the exception details (see code below) to help with debug but still cannot resolve:

I have attached all the code (in a zip file) needed to reproduce error including a 'Contact Us' page that will post fields to page creating the email.
In summary, this page posts to the email template, and then retrieves the HTML and sends the HTML by email to customer and client.

This library has never failed me until this project and I cannot seem to resolve.
My money is on an OVERFLOW error in the byte code when adding post keys.

Would love a HTTP expert to help with this - any help appreciated.

SHOULD BE EASY TO RUN ALL FILES!!

Thanks for your time.


----------------------
 
           string toName = string.IsNullOrEmpty(Request.Form["toName"]) ? String.Empty : Server.UrlDecode(Request.Form["toName"]);
            string toEmail = string.IsNullOrEmpty(Request.Form["toEmail"]) ? String.Empty : Server.UrlDecode(Request.Form["toEmail"]);
            string fromName = string.IsNullOrEmpty(Request.Form["fromName"]) ? String.Empty : Server.UrlDecode(Request.Form["fromName"]);
            string fromEmail = string.IsNullOrEmpty(Request.Form["fromEmail"]) ? String.Empty : Server.UrlDecode(Request.Form["fromEmail"]);
            string subject = string.IsNullOrEmpty(Request.Form["subject"]) ? String.Empty : Server.UrlDecode(Request.Form["subject"]);
            string message = string.IsNullOrEmpty(Request.Form["message"]) ? String.Empty : Server.UrlDecode(Request.Form["message"]);
 
------------------------------------------
 
 
catch (WebException wex)
            {
                if (this._doThrowExceptions)
                    throw wex;
 
                if (wex.Status == WebExceptionStatus.ProtocolError)
                {
                    HttpWebResponse response = wex.Response as HttpWebResponse;
                    if (response != null)
                    {
                        this._errorMessage = "HttpWebResponse.StatusCode=" + response.StatusCode + "|HttpWebResponse.StatusDescription=" + response.StatusDescription + "|" + wex.Message;
                    }
                }
                else
                {
                    this._errorMessage = wex.Message;
                }
                this._hasError = true;
                return null;
            }

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Question by:smacca
2 Comments
 
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Accepted Solution

by:
smokingspaceman earned 2000 total points
ID: 22820009
http://www.asp.net/learn/whitepapers/request-validation/

The error you could be getting is probably due to request validation. Try turning it off.

<%@ Page Language="VB" validateRequest="false"...>

This disables a security feature used for preventing script attacks.
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Author Closing Comment

by:smacca
ID: 31511026
Spot on!
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