.net - Redirect In Application_Error Redundant If Using CustomErrors?
Jun 9, 2010
If I have a customErrors section in my Web.config that says to redirect to Error.html, then putting code in the Application_Error method in the Global.asax to redirect to Error.html is redundant is it not? Technically, I could bypass the Web.config by redirecting to a different page in the Application_Error method if I wanted to, but since I don't want to go to a separate page I don't think I need the code.
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Oct 11, 2010
I am trying to use the Application_Error to redirect the user to a custom error page. I know I could use the web.config to do this, but let's assume for now that this is not a desirable path to take.
Initially, I tried to do a Response.Redirect to perform this, however, there seem to be occasions where the current http context does not define the response object. So, I attempted to perform a check to make sure that the response object is not null prior to attempting the redirection, and if it is not defined, perform a Server.Transfer instead.
What happens is that in most cases, the Redirect causes the browser to some generic "friendlyish" error page rather than the requested error page.
So then I tried using Server.Transfer exclusively, and this worked well for most cases, however, sometimes the transfer didn't seem to take in the browser. Changing it back to a redirect in these cases solved that problem, but reintroduced the issue where the errors previously being captured and transferred now were being redirected.
What I surmised from this is that in certain contexts where the Application_Error method is trapped, it is necessary to use Server.Transfer in redirection, whereas in others, it is necessary to use Response.Redirect. The question then became twofold: (a) When is one necessary and when is the other? and (b) What available information can I poll to tell me when a given condition exists.
After much searching, I cannot find a reasonable answer to this question. So I began to trap errors and examine the HttpContext object for some indicator. One thing that I was looking for is the reason why if even with a defined Response in the current context does a redirect fail. The only thing that stood out is that even though a Response object may exist, the Session data could be absent. I added the case to check whether the Session data was null and perform a Transfer in this case and it
seems to be handling it properly.
I emphasize "seems to be handling it properly" because no documentation I've been able to find confirms either the problem I am having or whether this is an appropriate strategy for solving it.
I guess the question is, am I on the right track here or is the null Session object just a red herring, indicative of nothing relevant. Here's the check I have set up for reference.
[Code]....
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Jan 22, 2010
I have the following settings. Asp.net 2.0 / Vs.net 2005 / Web.config -> customErrors mode="on"
<customErrors mode="On" defaultRedirect="~/ErrorPages/Default.aspx">
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Nov 23, 2010
http://blogs.msdn.com/b/tmarq/archive/2009/06/25/correct-use-of-system-web-httpresponse-redirect.aspx
http://weblogs.asp.net/bleroy/archive/2004/08/03/Don_2700_t-redirect-after-setting-a-Session-variable-_2800_or-do-it-right_2900_.aspx
I've followed the instructions in the two articles above, plus more and I still cannot get response.redirect to work. I am able to see the url of the page I am trying to redirect to in fiddler but the browser does not navigate to the page. I am using Cassini as a web server, could that be the problem?
Here is global.asax
[Code]....
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Mar 26, 2010
I have a situation where i have a dataset with many, many rows but few columns (5). Lets say in one row i have A,B then somewhere else in the dataset i could have another row that has B,A. What i want to do is if A,B exists then remove the row where B,A exists.
How does one go about doing this?
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Aug 4, 2010
I thought I would put those settings into Cache and then invalidate them if the web.Config file changes. Reading some articles make it seem that this is completely unnecessary.
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Oct 11, 2010
I've just uploaded an asp.net web project to a Fasthosts shared server (yes, I know!). The site works fine on a different server, and builds successfully. However, when I upload it (or even just the files in the App_Code folder) to the fasthosts server, I just get a flat error 500 message.
I've ensured that the web.config file includes: <customErrors mode="Off"/> but still nothing - just Error 500.
The Fasthosts server is running asp.net 3.5, which is what the web project is built to.
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Feb 23, 2010
RemoteOnly" defaultRedirect="~/Errors.aspx">
<error statusCode="404" redirect="~/Error.aspx?code=404"/>
</customErrors>
hrow new HttpException(404, "404 Not Found");
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Jun 15, 2010
Here is my customErrors section:
<customErrors mode="On" defaultRedirect="~/ServerError.aspx">
<error statusCode="403" redirect="~/NotAllowed.aspx" />
<error statusCode="404" redirect="~/404.aspx" />
<error statusCode="500" redirect="~/ServerError.aspx" />
</customErrors>
When an error occurs (I type in a non-existing page in address), I get the default IE "page not found" page.This happens both on localhost in development, and of course in live environment.I think this started happening since a recent Microsoft Update, which included most recent updates to .net.
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Dec 21, 2010
We developed an application in ASP.NET 3.5 on Windows Server 2003. (IIS 6.0)They are trying to deploy it on Windows Server 2008 IIS 7.5.But we are getting the old yellow screen message: Runtime ErrorDescription:
[Code]....
Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.
[Code]....
An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed.Details: To enable the details of this specific error message to be viewable on the local server machine, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "RemoteOnly". To enable the details to be viewable on remote machines, please set "mode" to "Off".We have turned off custom errors everywhere we can find in ASP.Net Error Pages and set it to Detailed Errors at all folder levels for IIS Error Pages.Still the yellow screen with custom errors and no detailed errors.If we switch the application pool to run in 32 bit = true, we get a detailed error. But we don't get very far with that because of Oracle issues and wouldn't really want to force it to run in 32 bit when it should really run in 64 bit anyway.So how do we get detailed messages from IIS while running in 64 bit?
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Jan 13, 2010
I successfully implemented role based authorization in ASP.NET. When a person does not have the needed role he gets to see an error page for 401.2 not authorized.
What I would like to accomplish now is to have a custom 401 page in my application and have it redirected there via settings in the web.config. I tried this:
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="401" redirect="NoAccess.htm" />
</customErrors>
But this does not get caught. Do I have to override it in IIS instead? I hope not as that would make getting things deployed harder.
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Sep 22, 2010
ASP.NET CustomErrors ignores when a dot before slash is in url
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Aug 18, 2010
We usually catch unhandled exceptions in Global.asax, and then we redirect to a nice friendly error page. This is fine for the Live environment, but in our development environment we would like to check if CustomErrors are Off, and if so, just throw the ugly error.
Is there an easy way to check if CustomErrors are Off through code?
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Feb 15, 2013
To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".i got this error during login time on the server how it can be solved
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Feb 21, 2011
I have writen error handling code in my Application_Error event in global.aspx page, but that event is not executed any time when error is occurring.So do I need to take care any other settings on my application to run this.
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May 24, 2010
The basic idea is we have a test enviroment which mimics Production so customErrors="RemoteOnly". We just built a test harness that runs against the Test enviroment and detects breaks. We would like it to be able to pull back the detailed error. But we don't want to turn customErrors="On" because then it doesn't mimic Production.
I've looked around and thought a lot, and everything I've come up with isn't possible. Am I wrong about any of these points?
We can't turn customErrors on at runtime because when you call configuration.Save() - it writes the web.config to disk and now it's Off for every request.We can't symlink the files into a new top level directory with it's own web.config because we're on windows and subversion on windows doesn't do symlinks.
We can't use URL-Mapping to make an empty folder dir2 with its own web.config and make the files in dir1 appear to be in dir2 - the web.config doesn't apply. We can't copy all the aspx files into dir2 with it's own web.config because none of the links would be consistent and it's a horrible hacky solution.
We can't change customErrors in web.config based on hostname (e.g. add another dns entry to the test server) because it's not possible/supported. We can't do any virtual directory shenanigans to make it work.
If I'm not, is there a way to accomplish what I'm trying to do? Turn on customErrors site-wide under certain circumstances (dns name or even a querystring value)?
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Oct 8, 2010
I'm trying to handle all my application exceptions inside the global.asax but from some reason it's not firing at all, i never tried to do it before so i guess i'm doing something wrong here...
here is the code inside the default.aspx page that throw the error:
[Code]....
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May 10, 2010
Whenever an unhandled exception occurs on our site, I want to:
Send a notification email Clear the user's session Send the user to a error page ("Sorry, a problem occurred...")
The first and last I've had working for a long time but the second is causing me some issues. My Global.asax.vb includes:
[Code]....
When I run a debug, I can see the session being cleared, but then on the next page the session is back again!
I eventually found a reference that suggests that changes to session will not be saved unless Server.ClearError is called. Unfortunately, if I add this (just below the line that sets "ex") then the CustomErrors redirect doesn't seem to kick in and I'm left with a blank page?
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Nov 30, 2010
i am new in asp.net mvc. Sometimes i have an exception in Application_Error and i write it to my log file:
[Code]....
I trying debug but i not see file name? How to see witch file cannot be found ?
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Oct 22, 2010
I have the following code in my Global.asax file:
[code]....
To provide neat and tidy error urls like "/Error/404/TheNameOfTheRequestedPage". This works fine from VS 2008, but once published to my local machine, I get the default error page:
Error Summary
HTTP Error 404.0 - Not Found The resource you are looking for has been removed, had its name changed, or
is temporarily unavailable
I've chosen not to use system.web/customErrors because I don't have access to Server.GetLastError() from there (or at least it's never worked for me) and I want to get the http code.
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Jun 4, 2010
the application keeps running even after Application_Error event is called, is there any way to terminate the application in that event itself
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Nov 28, 2010
When I start debugging my application using vs2010 before the default.aspx page is rendered the application_error event is fired in global.asax.
There is nothing happening in the page_load of the default.aspx screen.However, if I set a break point on the default.aspx page_load event and the application_error event here are the sequence of events: The page_load event of default.aspx is fired, there is no code to execute there so I hit F5 to continue. The application_error event is then fired.Here are some of the details from Server.GetLastError();
exception message is "File does not exist."
stack trace:
at System.Web.StaticFileHandler.GetFileInfo(String virtualPathWithPathInfo, String physicalPath, HttpResponse response)
at System.Web.StaticFileHandler.ProcessRequestInternal(HttpContext context, String overrideVirtualPath)
[code]...
I have absolutely no idea why this event is fired. Do all of the events in the Global.asax get fired on startup?There is nothing happening on the page_load so how can an error be thrown?
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Dec 18, 2010
By defauly in my web.config I have set the , in runtime I just want to change the Mode = "Off" in memory. I do not want to save the changes to web.config.
Basically we need to see the description of the runtime error, when required.
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Dec 20, 2010
In my ASP.NET 3.5 Website which is published in shared hosting provider , I've configured my web.config file like this :
<customErrors mode="On" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="AccessDenied.htm"/>
<error statusCode="404" redirect="FileNotFound.htm"/>
[code]...
This is a yellow page which is not user friendly and we didn't expect . I'm wondering setting customeError in webconfig doesn't support this type of address or not ? How can i prevent users seeing this yellow page . Edit : solution you mentioned are about configuring IIS ,But as i mentioned earlier , my site has been published on shared hosting provider . I don't have those access at IIS , What should i do at this situation ?
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Sep 30, 2010
My Web.config customErrors section is given below
<customErrors
mode="RemoteOnly"
defaultRedirect="error.htm"></customErrors>
How can I exclude a aspx page from DefaultRedirect, if errors occur in that page?
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