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POCustom Error Handling in web.config / Global.asax not handling non-existant directory
 

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  1. POCustom Error Handling in web.config / Global.asax not handling non-existant directory
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    <p>Question is: Why is custom Error handling not working for non-existing paths/directories?</p> <p>Updated with fixed code (thanks to everyone for you input):</p> <p><em><strong></em>* Updated code for web.config and global.asax <em>*</em></strong></p> <pre><code>&lt;httpErrors errorMode="Custom"&gt; &lt;remove statusCode="500" subStatusCode="-1" /&gt; &lt;remove statusCode="404" subStatusCode="-1" /&gt; &lt;error statusCode="404" subStatusCode="-1" prefixLanguageFilePath="" path="/*****.aspx" responseMode="ExecuteURL" /&gt; &lt;error statusCode="500" subStatusCode="-1" prefixLanguageFilePath="" path="/*****.aspx" responseMode="ExecuteURL"/&gt; &lt;/httpErrors&gt; added this to the global.asax to stop IIS from handling my 500 errors after @Kev's suggestions IIS handled my 500's these lines fixed that HttpApplication myApplication = new HttpApplication(); myApplication.Response.TrySkipIisCustomErrors = true; </code></pre> <p>We have a site setup with custom error handling in <code>web.config</code> and <code>global.asax</code> (the setup is shown below). We are able to handle all 404's and 500's with no problems. The errors are caught in the <code>Application_Error</code> in the <code>global.asax</code>, logged to a DB then using <code>HttpContext</code> we set the status code and use <code>Server.Transfer()</code> to move the user to the appropriate error page (redirects cause a 302, and hurts SEO).</p> <p>The problem is when the user types in <code>http://www.example.com/whatever</code> a blank page is shown in Firefox and in IE it shows the IE 404 page. Firebug shows no status codes being fired, and when I debug the solution, no breakpoints I have set are hit in the <code>global.asax</code>. The odd thing is that a user can enter <code>http://www.example.com/whatever/hmm.aspx</code> and an error will be hit. It seems it's only working on non-existing pages and not paths/directories that don't exist. </p> <p>Below is my <code>web.config</code> code for the Errors and my <code>global.asax</code> code for Application error.</p> <p>I've added the <em>*</em>* to hide info, they have valid <code>.aspx</code> pages in them:</p> <p>Web config:</p> <pre><code>&lt;customErrors defaultRedirect="~/******.aspx" mode="On" redirectMode="ResponseRewrite"&gt; &lt;error statusCode="500" redirect="~/*****.aspx" /&gt; &lt;error statusCode="404" redirect="~/*****.aspx" /&gt; &lt;/customErrors&gt; &lt;httpErrors errorMode="Custom"&gt; &lt;remove statusCode="500" subStatusCode="-1" /&gt; &lt;remove statusCode="404" subStatusCode="-1" /&gt; &lt;error statusCode="404" subStatusCode="-1" prefixLanguageFilePath="" path="/*****.aspx" responseMode="ExecuteURL" /&gt; &lt;error statusCode="500" subStatusCode="-1" prefixLanguageFilePath="" path="/*****.aspx" responseMode="ExecuteURL"/&gt; &lt;/httpErrors&gt; </code></pre> <p>Code:</p> <pre><code>protected void Application_Error(Object sender, EventArgs e) { // At this point we have information about the error HttpContext ctx = HttpContext.Current; // set the exception to the Context Exception exception = ctx.Server.GetLastError(); // get the status code of the Error int httpCode = ((HttpException)exception).GetHttpCode(); // get the IP Address String strHostName = string.Empty; String ipAddress_s = string.Empty; strHostName = System.Net.Dns.GetHostName(); System.Net.IPHostEntry ipEntry = System.Net.Dns.GetHostByName(strHostName); System.Net.IPAddress[] addr = ipEntry.AddressList; for (int i = 0; i &lt; addr.Length; i++) { ipAddress_s += "IP Address {" + (i + 1) + "} " + addr[i].ToString() + Environment.NewLine; } // setup the error info one for user display and one for the DB Insert string errorInfo = "&lt;br /&gt;&lt;b&gt;Error Location:&lt;/b&gt; " + ctx.Request.Url.ToString() + "&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Error Source:&lt;/b&gt; " + exception.Source + "&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Error Try/Catch:&lt;/b&gt; " + exception.InnerException + "&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Error Info:&lt;/b&gt; " + exception.Message + "&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Status Code:&lt;/b&gt; " + httpCode + "&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Stack trace:&lt;/b&gt; " + exception.StackTrace; string errorInfoDB = "||Error Location: " + ctx.Request.Url.ToString() + "||Error Source: " + exception.Source + "||Error Try/Catch: " + exception.InnerException + "||Error Info: " + exception.Message + "||HttpErrorCode: " + httpCode + "||Stack trace: " + exception.StackTrace + "||IP Address: " + ipAddress_s; // clean the input befor you put it in the DB char quote = (char)34; char filler = (char)124; char tick = (char)39; char greaterThan = (char)60; char lessThan = (char)62; errorInfo = errorInfo.Replace(quote, filler); errorInfo = errorInfo.Replace(tick, filler); errorInfo = errorInfo.Replace(greaterThan, filler); errorInfo = errorInfo.Replace(lessThan, filler); errorInfoDB = errorInfoDB.Replace(quote, filler); errorInfoDB = errorInfoDB.Replace(tick, filler); errorInfoDB = errorInfoDB.Replace(greaterThan, filler); errorInfoDB = errorInfoDB.Replace(lessThan, filler); string pattern = string.Empty; string replacement = "sQueEl"; pattern = "/cookie|SELECT|UPDATE|INSERT|INTO|DELETE|FROM|NOT IN|WHERE|TABLE|DROP|script*/ig"; errorInfoDB = Regex.Replace(errorInfoDB, pattern, replacement); pattern = "/cookie|select|update|insert|into|delete|from|not in|where|table|drop|script*/ig"; errorInfoDB = Regex.Replace(errorInfoDB, pattern, replacement); if (httpCode == 404) { InSert_To_DB_Class(*****, *****, *****, *****, *****, errorInfoDB); } else { InSert_To_DB_Class(*****, *****, *****, *****, *****, errorInfoDB); } // set the error info to the session variable to display to the allowed users Application["AppError"] = errorInfo; // clear the error now that is has been stored to a session ctx.Server.ClearError(); ctx.Response.ClearHeaders(); // set the status code so we can return it for SEO ctx.Response.StatusCode = httpCode; ctx.Response.TrySkipIisCustomErrors = true; HttpApplication myApplication = new HttpApplication(); myApplication.Response.TrySkipIisCustomErrors = true; try { if (ctx.Request.RawUrl.Contains("/*****")) { // redirect to the error page ctx.Server.Transfer("~/*****.aspx", false); } else if(ctx.Request.RawUrl.Contains("/*****")) { ctx.Server.Transfer("~/*****/*****.aspx", false); } else { // check the httpCode if (httpCode == 404) { // set the page name they were trying to find to a session variable // this will be cleared in the ****** page Application["404_page"] = exception.Message; // redirect to the 404 page ctx.Server.Transfer("~/*****", false); } else { // redirect to the error page ctx.Server.Transfer("~/*****", false); } } } } </code></pre>
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