Question 246894 in ASP.NET Question posted in
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Asp.net – How to I add a MIME type for a single specific file without extension in IIS?

I’ve been getting a lot of 404 notifications on the .well-known/traffic-advice location on my server. After doing some research it turns out the Chrome Privacy Preserving Prefetch Proxy tries to find instructions on prefetching content from the website.

I would like to add this file to give a proper response, but the file needs a specific MIME type: application/trafficadvice+json

In IIS it is easy to add a new MIME type for a specific extension, but in this case the ‘traffic-advise’ file has no extension. Also it’s not advisable to specify a MIME type for all extension-less files.

How can I add the MIME type for this specific file in IIS (or web.config)?

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  1. Chosen as BEST ANSWER
    0

    As other solutions did not work for me, I used the following workaround to make it work:

    1. Add an extension to the file (/.well-known/traffic-advice) so it becomes traffic-advice.tdjson
    2. Add the MIME type for tdjson in web.config (or use IIS):
        <system.webServer>
      <staticContent>
        <mimeMap fileExtension=".tdjson" mimeType="application/trafficadvice+json" />
      </staticContent>
    </system.webServer>
    1. Install the URl rewrite module (https://www.iis.net/downloads/microsoft/url-rewrite)
    2. Add this rule to your Redirects.config file
        <rule name="wellknown trafficadvice" stopProcessing="true">
      <match url="^.well-known/traffic-advice$" ignoreCase="true" />
      <action type="Redirect" url="/.well-known/traffic-advice.tdjson" redirectType="Permanent" />
    </rule>
    1. Done

  2. 0

    You might get started from

        <location path=".well-known/traffic-advice">
        <system.webServer>
            <staticContent>
                <mimeMap fileExtension="." mimeType="application/trafficadvice+json" />
            </staticContent>
        </system.webServer>
    </location>

    Revise it if you have multiple files with different MIME types in mind.

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