Web requests, allowed URL and forgetting www

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Assume I want to get data from page  https://www.abc.com  using web requests
However in the Allowed URL user  input https://abc.com     because when copy pasting from browser the www  gets neglected. 
The web-request fails in this case as the web request returns -1.

My understanding is Allowed URLs list cannot be accessed to determine in advance.

One way to overcome this is to have the code see if the previous web-request returned -1, replace the "www" and try again. 

Can anyone suggest a different solution?
Thank you.
 

This is a suggestion as I have not verified this ...

When the WebRequest fails and returns -1, check the last error code.

I suspect that one of the returned error codes, possibly error code 5200, may be a good indicator of when the URL is not defined in the Options "Allowed" filter.

Operations with WebRequest

 

 

ERR_WEBREQUEST_INVALID_ADDRESS

5200

Invalid URL

ERR_WEBREQUEST_CONNECT_FAILED

5201

Failed to connect to specified URL

ERR_WEBREQUEST_TIMEOUT

5202

Timeout exceeded

ERR_WEBREQUEST_REQUEST_FAILED

5203

HTTP request failed
However, I don't think this will be fool-proof. Just a good indication of the situation.
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