CODEWITHSUNDEEP
asp.net
Kurt S
Kurt S

Reputation: 21357

Why does Application_BeginRequest() fire twice when refreshing browser?

I'm observing some really confusing behavior with the Application_BeginRequest event in my Global.asax file (in an ASP.NET MVC app). When running through the debugger, if I Refresh my browser (IE7), this event fires twice. If I click a link or otherwise manually request a page, it fires once - as expected.

Why does a refresh cause BeginRequest to fire twice?

I'm observing this with a brand new MVC project with the following addeded to Global.asax.cs

protected void Application_BeginRequest() { 
    //executed twice
}

For context, I'm trying to add a new object to the HttpContext.Current.Items collection during this event, so it will persist through the entire request process. Obviously, I don't want this to happen twice for a single refreshed request!

Upvotes: 6

Views: 7073

Answers (4)

chris166
chris166

Reputation: 4807

Are you sure it's really 2 request to the same URL? I would think that the second is probably some dynamic JS, CSS or image file. Try to find out either with Fiddler or by looking at HttpContext.Current.Request.Uri in the debugger

Upvotes: 8

Chris Shaffer
Chris Shaffer

Reputation: 32575

Something that surprised me a while back was that if you have an img tag in your html that doesn't have a proper image path, some browsers will make a request to the original page. Here is a related blog post.

Upvotes: 2

Philippe Leybaert
Philippe Leybaert

Reputation: 171774

Do you have a reference in your HTML to something that also passes the ASP.NET pipeline, like a dynamically generated image or something like that?

Upvotes: 0

Spencer Ruport
Spencer Ruport

Reputation: 35117

I'm not sure why this is occuring but I find it's easier to create a BaseController class and have all my controllers inherit from it. Alter the constructor to add your item to the HttpContext.

Upvotes: 0

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