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IHttpModule not getting called

Posted on 2009-07-09
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Last Modified: 2013-11-30
Put simply, is there any reason why an IHttpModule would not get called for requests for script files?  My module is set to gzip compress all JSON responses, and also all script files.  It works perfectly locally, but when I deploy it to my shared hosting account, it **only works for the JSON responses**.

Is there some IIS setting that they might have to cause requests for these files to bypass my HttpModule somehow?

Thanks!
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Question by:ARACK04
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6 Comments
 

Author Comment

by:ARACK04
ID: 24813775
Also, here's the complete code for my module:
using System;
using System.IO;
using System.IO.Compression;
using System.Globalization;
using System.Web;
 
 
public class JsonCompressionModule : IHttpModule {
    public JsonCompressionModule() {
    }
 
    public void Dispose() {
    }
 
    public void Init(HttpApplication app) {
        app.PreRequestHandlerExecute += new EventHandler(Compress);
    }
 
    private void Compress(object sender, EventArgs e) {
        HttpApplication app = (HttpApplication)sender;
        HttpRequest request = app.Request;
        HttpResponse response = app.Response;
 
        if (request.ContentType.ToLower(CultureInfo.InvariantCulture).StartsWith("application/json") ||
            request.Url.ToString().Contains(".js")) {
 
            if (!((request.Browser.IsBrowser("IE")) && (request.Browser.MajorVersion <= 6))) {
                string acceptEncoding = request.Headers["Accept-Encoding"];
 
                if (!string.IsNullOrEmpty(acceptEncoding)) {
                    acceptEncoding = acceptEncoding.ToLower(CultureInfo.InvariantCulture);
 
                    if (acceptEncoding.Contains("gzip")) {
                        response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
                        response.AddHeader("Content-encoding", "gzip");
                    } else if (acceptEncoding.Contains("deflate")) {
                        response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
                        response.AddHeader("Content-encoding", "deflate");
                    }
                }
            }
        }
    }
}

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Accepted Solution

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crazyman earned 500 total points
ID: 24814294
Script files are static content, and wont be mapped in iis to the asp.net runtime, therefore the request will never hit asp.net let alone your HttpModule.

You may append .js.aspx and they will come through asp.net but you will need to work your handler into mapping that to the correct phyical file...
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LVL 13

Expert Comment

by:crazyman
ID: 24814332
This window in IIS controls what file extensions map to what, you can add to these as you wish.
IIS.gif
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Author Comment

by:ARACK04
ID: 24814412
Genius, thanks!

Why did it work in localhost though?  Are requests through localhost not capable of knowing what's static, and just send everything through the ASP.NET runtime?
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Author Comment

by:ARACK04
ID: 24814522
Instead of .js.aspx, couldn't I just add .js to the extensions handled by .NET directly?  Also, if I did that, would it still work for requests with a querystring added on, like

foo.js?ver=1.6    

I would assume so since requests like that still work for .aspx files.

Thanks for putting up with this simple (probably stupid) question!
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LVL 13

Expert Comment

by:crazyman
ID: 24815051
It works on localhost because the development server in visual studio routes all traffic through the runtime.

You could indeed map .js to asp.net and handle them there.
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