Error encountered: WebResource.axd is not found on the .net webforms website when accessed through Cloudfront

I am facing a challenge with migrating an existing .NET webforms site to work behind Cloudfront as all the webforms are breaking.

Upon further investigation, it has been discovered that the site appears fine, but the webforms are breaking because the 

<script src="/WebResource.axd?[...]">
is completely missing. It is not showing a 404 error, but rather the script tag is missing entirely from the HTML response.

It appears that .NET is detecting the browser and generating a customized version of WebResource.axd for that specific browser and page combination.

If there is no match for the browser, then no WebResource.axd file is included.

Even when using 

curl http://some-aspnet-webforms-site.example.com/form.aspx
, it is confirmed that WebResource.axd is not being included.

How can I configure Cloudfront to mimic the end-user's browser in order to include WebResource.axd? (Forwarding cookies and query strings does not appear to work, and forwarding all headers seems to cause issues with Cloudfront.)

Alternatively, how can I ensure that .NET always injects/inserts WebResource.axd even if browser sniffing fails?

javascriptasp.netwebformsamazon-cloudfront

Answer №1

To resolve the issue, the solution involved making changes to the Cloudfront distribution settings. Specifically, in the Behavior section, the ".net webforms behavior" settings were modified to forward only the "User-Agent" header in the whitelist. Additionally, it was necessary to forward cookies and possibly the querystring as well.

It appears that the WebResource is compiled based solely on the user agent, as discussed in this Stack Overflow post.

The problem was resolved by forwarding the user-agent header, allowing the webforms to function properly once again.

Interestingly, forwarding "All" headers in Cloudfront caused issues. Although the specific cause of the problem resulting from forwarding all headers is unknown, it led to generic AWS "Access Denied" error pages.

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