asp.net mvc bundles gzip compresstion not work

Question

My Bundle Config is like this :

public class BaseBundleConfig
{
    public static void RegisterBundles(BundleCollection bundles)
    {
        bundles.Add(new ScriptBundle("~/bundles/Models").IncludeDirectory("~/Scripts/models/", "*.js", true));

        bundles.Add(new ScriptBundle("~/bundles/framework").Include(
                                            "~/Scripts/framework/frameworkmodels.js",
                                            "~/Scripts/framework/appbase.js",
                                            "~/Scripts/framework/directives/directives.js",
                                            "~/Scripts/framework/services/Services.js",
                                            "~/Scripts/framework/controllers/controllers.js",
                                            "~/Scripts/framework/filter/filters.js",
                                            "~/Scripts/app/filter/customFilters.js"
                                            ).Include("~/Scripts/app.js"));


        bundles.Add(new StyleBundle("~/Content/css").Include(
                                        "~/Content/libs/bootstrap/bootstrap.min.css",
                                        "~/Content/libs/bootstrap/bootstrap-theme.min.css",                                     
                                        "~/Content/libs/bootstrap/angular-csp.css",
                                        "~/Content/libs/bootstrap/mainStyle.css"
                                        ));

        BundleTable.EnableOptimizations = true;

    }
}

and I used bundle's inside index.cshtml like this:

......
@System.Web.Optimization.Scripts.Render("~/bundles/framework")

.....
@System.Web.Optimization.Styles.Render("~/Content/css")

after publish on IIS 8.5. bundling and minification works as expected but bundles are not compressed for both ScriptBundle and StyleBundle. response content-type always is text/javascript or text/css. why gzip compression is not working?

dynamic and static content compression both are set to true in web.config

<system.webServer>

    <urlCompression doStaticCompression="true" doDynamicCompression="true" />
</system.webServer>

MVC assembly's version: System.Web.Mvc 5.2.3.0 System.Web.Optimization 1.1.0 and Dynamic Compression module is also installed on server.

new info: two screenshot, first is IIS request tracing log that show dynamic compression module doing it's job, and second one is chrome network tab response headers for that request. why Transfer-Encoding:chunked and response is not gzip :\

thanks for your ideas

Answer 1

Add an <httpCompression> section to your web.config before or after <urlCompression>. Here is mine:

<httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
    <dynamicTypes>               
        <add mimeType="text/*" enabled="true" />
        <add mimeType="message/*" enabled="true" />
        <add mimeType="application/javascript" enabled="true" />
        <add mimeType="application/x-javascript" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="*/*" enabled="false" />
    </dynamicTypes>
    <staticTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="message/*" enabled="true" />
        <add mimeType="application/javascript" enabled="true" />
        <add mimeType="application/x-javascript" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="*/*" enabled="false" />
    </staticTypes>
</httpCompression>

Note this doesn't kick in unless the bundle is 1024 bytes or larger (minFileSizeForComp) so you don't waste time compressing files that are already very small.

Note also that you'll need to make sure the gzip.dll is in this folder.

Answer 2

I found the problem point, hardware firewall between clients and IIS decompress gzip data and after processing content, send it chunked to client, when i try from other clients outside of company, gzip compression work as I expected.