How to debug when added MIME Type is not working on IIS for .Net Core projects

user_1573267 0
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When I refer to an ".apk" file in the browser whether it be http or https response is error 404 and it don't start to download that file.

The address of ".apk" is http://example.com/Upload/App/a.apk and to verify that I'm pointing to correct address I've placed a picture file in that location (http://example.com/Upload/App/a.png) and I could open the picture by browser.

I've searched over stackoverflow and google and tried everything on several first pages but all of them are providing the same contents and while the provided solution is working for everyone it doesn't work for me.

What I've tried:

I've done this steps as provided in all articles, questions, documentations:

  1. In IIS manager I've selected website and clicked on MIME Types
  2. I've clicked on Add hyper link and defined a new MIME Type
  3. Values are ".apk" for extention and "application/vnd.android.package-archive" for MIME Type

I've realized this lines has been added to web.config automatically:

<system.webServer>
    <staticContent>
        <mimeMap fileExtension=".apk" mimeType="application/vnd.android.package-archive" />
    </staticContent>
</system.webServer>

After defining the new MIME Type I've restarted website, restarted whole IIS service, I still get a 404 error it is appreciated if someone could guide me how to debug the problem from this point.

Tracing Log:

As suggested in comments I've enabled Troubleshooting Failed Requests Using Tracing:

Headers="Connection: close
Accept: 
text/html,application/xhtml+xml,
application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed- 
exchange;v=b3
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
.net-core iis mime-types c#
1 Answers

My search over stackoverflow and google was wrong. My deployed project on IIS is a .Net Core website and it seems in .Net Core projects there is no need to add new MIME Types in IIS server. Instead MIME Types are handled in Configure() method inside Startup.cs

var provider = new FileExtensionContentTypeProvider();
provider.Mappings[".apk"] = "application/vnd.android.package-archive";

app.UseStaticFiles(new StaticFileOptions
{
    ContentTypeProvider = provider
});
user_15732670
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