You'd have to create a new class which subclasses Apache::FakeRequest, and re-bless the object into that class.
Attempting to overwrite the method (e.g. which '*Apache::Request::lookup_uri = sub { ... }') would affect all Apache::Request objects within the script.

In reply to Re: changing object's methods at runtime by kilinrax
in thread changing object's methods at runtime by ViceRaid

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