Why Does App_offline.htm Keep Appearing In Web Project
Jan 27, 2010
I regularly (every few days or so) publish my ASP.NET web project to the local web server.
But the weirdest thing keeps happening... a file called "app_offline.htm" keeps appearing, unbidden, in my web project!
I have deleted this file several times, it is not in source control, and AFAIK nobody else is tampering with the project. But practically every time I try to publish the project, my publish fails (Unable to add 'app_offline.htm' to the Web site. The file 'app_offline.htm' already exists in this Web site.Error: The operation could not be completed. Unspecified error), I go back to look at the project, and there it is again, large as life, and I suspect if it could it would be blowing raspberries at me.
Having read up a little about this file, I gather it's meant to be an easy way to take your app offline. But I didn't see anywhere that it's supposed to impose itself on you arbitrarily for no good reason.
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When I make an asp.net web application and add class libraries to the solution, the website project itself has a folder with the same name/contents as the class library.
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Feb 14, 2010
When I make an asp.net web application and add class libraries to the solution, the website project itself has a folder with the same name/contents as the class library.
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I read why this happens in a book a while ago but can't quite remember now.
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Aug 23, 2010
Normally, I use App_Offline.htm for taking the site offline. But occasionally, when I do that, the site just hangs (like in: browsers wait forever, server gives no response at all). This seems to happen on an updateable site when I change something, like a control and afterward, when it doesn't go quick enough (site hangs), I place App_Offline.htm in the root of the website.
In most cases, this immediately takes down my site. But occasionally it doesn't. In those cases, I cannot just stop the website (when I restart, the behavior continues). Stopping the application pool doesn't let me restart the same app pool. The only two solution so far is restarting the whole IIS web service.
I'd like to prevent this from happening. Is this a bug in IIS not "breaking all actions" when App_Offline.htm is found? I use IIS 7 with Windows 2008 SP2 64 bit.
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May 17, 2010
When I publish my ASP.NET MVC application it generates a app_offline.htm file to take the site offline while it updates the website and then deletes the file once the publish is successful.
This is cool and I really like the idea, but I want to create my own custom app_offline.htm file that the publish action is aware of and put it somewhere where it doesn't effect my development site - i.e. it doesn't sit in the root of my development site rendering it offline all the time.
EDIT: From the comments on Scott Gu's post about app_offline.htm, it seems that customization of the app_offline.htm file wasn't possible with VS 2005 - has this changed with VS 2008 and now VS 2010?
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Apr 21, 2010
I loved the features of using app_offline.htm on my ASP.NET WebForm based sites.
Upload the file and your app is immediately "offline". Snappy.
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Dec 3, 2010
I have a web app that has an app_offline.htm file, this file is stored in source control along with everything else.
The problem I have is that each time I (or any other developer) do a get latest on the source I get the app_offline.htm file and then when I try to run the app all I see is the app_offline rather than the actual web site.
Is there way that I can stop this from happening?
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In quite some scenario's, placing app_offline.htm in the root is just right: you do some updates, the message appears while updating, and that's that. The idea is, as Microsoft puts it, that before anything is called, IIS first checks if app_offline.htm is there and if so, it cancels everything and displays it.
So for so good, but in many situations it doesn't work:
When you have a compile error in an ASPX page and a user links directly to it When you have conflicting assemblies When you have a parsing error in your web.config In the midst of removing / uploading the entire site.
A direct link to a static HTML page is still displayed as suchm File-not-founds, access-denieds are thrown before the message is shown Possibly more scenario's exist that fail. My point is: for any serious updating work, app_offline.htm is not suitable. I sometimes create a redirect in IIS, to another site, but another site may not always be available and it can confuse users.
Ideally, I'd want to keep the current location in the url location bar of the end-user, show the message, and have the page auto-refresh each minute to see whether the site is back, so that the user continues where he left of when the site comes back. While technically easy enough with a static page, it will fail for the above mentioned reasons the minute an error is thrown.
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I am looking in the Solution Explorer, and I also looed in Windows Explorer . . . not a sign of it. ?
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code:
if(File.Exists(filename))
{
File.Delete(filename);
}
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