G'day rsFalse,

"... shows strange url ..."

Those are just standard escapes for characters which might otherwise be misinterpreted.

$ perl -E 'say sprintf "%%%02x", ord for qw{/ ? =}'
%2f
%3f
%3d
[download]

In this case, they all occur in the fragment identifier, in which '/' is not a pathname separator; '?' does not introduce a query string; and, '=' is not a key-value separator.

Obviously, that shouldn't be a fragment identifier (the '#' should be a '/'); and the URI shouldn't have 'http://search.cpan.org/perldoc/' at the beginning; but your (or, indeed, any) browser has no way of knowing what it should be — it just deals with the URI it's been given.