IIS web app file download

Question

Have IIS 10 for our VM - one application prompts to download the Access File. The other does not. Both have the MIME type set locally to application/octet-stream for extension .mdb

I have placed identical code (.cshtml) ( with a static file path to the same file on our server ). The link looks identical - but one prompts me to download the other doesnt ....

Clues ?

Thanks

Answer 1

The cshtml would likely be calling back to a controller to download the file. Therefore the problem would need to be on the controller side. You can easily test this by foregoing the HTML and use CURL or Postman to attempt to download the file directly. If it works then the server side code is fine. Can you post the code that isn't working? Have you tried setting a breakpoint in the controller code to confirm it is even hitting the correct controller action and trying to download the file.

Answer 2

Hi @LKA-116

You can try to add the following lines to that section in your web.config, for example your web.config should be similar to this:

<system.webServer>  
    <security>  
      <requestFiltering>  
        <fileExtensions allowUnlisted="true" >  
          <remove fileExtension=".mdb" />  
          <add fileExtension=".mdb" allowed="true"/>  
        </fileExtensions>  
     </requestFiltering>  
   </security>  
 </system.webServer>  

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Answer 3

Sorry for late check back. I republished this code to a new app with a small change to the Application name. The prompt triggered. I then called the app from another website/application in our company. When called from another site, the prompts no longer show.

The first web site seemed to block or over-ride ( MIME setting ).

I then added the changes to the web.config file above. I could still get the prompt when I called the app site directly, but NOT when called from another site. Yet the first site allows download. So no change