Http Error 404 Asp.net
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a https://support.microsoft.com/en-us/kb/315122 minute: Sign up Problem mapping HttpHandler --> HTTP Error 404 Not Found up vote 28 down vote favorite 4 I am having problems trying to map an HttpHandler in the web.config. This is the relevant config bit: When I navigate to http://localhost/myApp/whatever.hndlr I am getting a server error 404 (not found). It's http://stackoverflow.com/questions/2858738/problem-mapping-httphandler-http-error-404-not-found the 1st time I am hooking up an HttpHandler so I might be missing something - any help appreciated! UPDATE: I managed to get it working using both answers so far - who's able to exaplin why it works gets the answer marked! This is my config (won't work if Don't have both - I am running IIS7 in classic mode) System.web: System.webserver: asp.net configuration httphandler web-config share|improve this question edited May 20 '10 at 17:20 asked May 18 '10 at 15:35 JohnIdol 23.4k43125218 1 Further to your update, if you are using IIS6 antything you put in the System.webserver section will be ignored as this is used only in IIS7 Integrated Pipeline mode. THe only reason to have both would be to have a single web.config that is valid for IIS7 pipelined and calssic mode and IIS6. –Ben Robinson May 20 '10 at 16:22 sorry it's IIS7 - but does that change things? If I remove the
October 02, 2009 3:21 PM As mentioned at the end of my previous post on handling errors with ASP.NET, handling "404 Not Found" errors are particularly problematic (if you haven't read it http://www.andornot.com/blog/post/Handling-404-errors-with-ASPNET.aspx yet, please do so). And looking around, the vast majority of information out there on http://benfoster.io/blog/aspnet-mvc-custom-error-pages it is not complete, misinformed, or flat-out wrong (but I greatly appreciate all efforts!). And I would argue that this is because ASP.NET implementation of 404 error handling is flat-out-wrong. So with my super hero cape on, here I come to wobbly save the day! The typical ASP.NET way to handle 404 errors is to put something http error like the following in your Web.config: Make a page-not-found.aspx page and voila! Ya got 'er dun! If you're a little more on the ball, you'll realise that while this configuration works for end users (gives them a pretty page to look at hopefully clearly explaining that you can't find what they're looking for), it's bad for SEO (search engine optimization) because it sends back a 302 http error 404 temporary redirect to your 404 page which in turn sends back a "200 OK" message. In other words, "Yeehah! No problems here as you've found what you're looking for! Index away!" So, bright developer that you are, you add in some applicable status code into your 404 page thinking that should take care of it: protected override void OnLoad(System.EventArgs e){ Response.TrySkipIisCustomErrors = true; // For IIS 7 Integrated Pipeline - see previous post Response.Status = "404 Not Found"; Response.StatusCode = 404; base.OnLoad(e);} Well, fire up Fiddler and you'll discover that you're still getting a 302 temporary redirect to your 404 page. So you fire up your error handling code and for 404s, you Server.Transfer to your 404 page just like all your other error transfers take place! But no, bafflingly enough, even running through a debug session to ensure you're properly catching your 404, ASP.NET still insists on 302'ing your precious response (although at least now your 404 page is sending back the proper "404 Not Found" error status). So go out there and google everywhere and try every suggestion (just a sampling) and then breathe a prayer of thanksgiving for me and my super-duper super hero cape, because this is how you make your way to the 404 handling bliss (caveat: thoroughly tested o
you're not alone. It's surprisingly difficult to do this correctly, not helped by the fact that some errors are handled by ASP.NET and others by IIS. Ideally (and I expect such is the case with some other frameworks/servers) we would just configure our custom error pages in one place and it would just work, no matter how/where the error was raised. Something like: Custom 404 error pages When a resource does not exist (either static or dynamic) we should return a 404 HTTP status code. Ideally we should return something a little friendlier to our site visitors than the error pages built in to ASP.NET/IIS, perhaps offering some advice on why the resource may not exist or providing an option to search the site. For the purposes of this blog post, my custom 404 page is very simple, but you can see some really nice examples here.
404 Page Not Found 404 Page Not Found
I created a new ASP.NET MVC 5 application using the standard template in Visual Studio. If I run the site and try to navigate to a resource that does not exist e.g. /foo/bar, I'll get the standard ASP.NET 404 page with the following information: Server Error in '/' Application. The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly. Requested URL: /foo/bar Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.33440 Not exactly friendly, is it? In this case the error was raised by ASP.NET MVC because it could not find a matching controller and/or action that matched the specified URL. In order to set up a custom 404 error page add the following to web.config inside
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I've set mode="On" so we can view the custom errors pages locally. Generally you would only want to display these in production so would set mode="RemoteOnly". Now if I navigate to /foo/bar once more I see my custom error page. However, the URL is not /foo/bar as I'd expect. Instead ASP.NET issued a redirect to /404.html?aspxerrorpath=/foo/bar. Also if I check the HTTP status code of the response, it's 200 (OK). This is very wrong indeed. Not only is is misleading as we're re