[squid-users] Cosmetics: How to eliminate HTTP error msg completely ?

Actually, I have a private proxy on the web, set up to be used by me only,
when on the road, in areas of slow wired/wireless connection. Part of it is
to remove ads, when browsing. This is done using local DNS on squid machine,
pointing to 127.0.0.1 for well known ad sites. And a patched web server on
squid machine, always serving minimum content, so no error is visible in the
browser, at least.
This works fine.
Now, quite a few ad providers start using https:\\wellknown.adsite.com .
Which then leads to the following error message in the browser, instead of
the ad:
"The connection has timed out
The server at wellknown.adsite.com is taking too long to respond."
(504 Gateway Timeout)
I assume, because the CONNECT will not get any response from my local
(faked) wellknown.adsite.com

Any suggestion, how/where to hack squid2.7 to also get rid of these ones ?
My idea just now is modifying "504 Gateway Timout" to "204 No Content".
Not knowing https-protocol, will this lead to more errors later on ?
Or any other ideas ?

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