SafeSquid 4.2.1 is focused on improvisations in logs, and handling of
forwarded requests.

# Until SafeSquid 4.2.0 SafeSquid needed a restart when the logfiles
reached 2GB size.
From 4.2.1 this limitation is removed.

# The Native log will now record the application of "profiles".

# A unique record identifier will now be printed with every line of
extended log,
to prevent duplication of records when imported into SQL databases.

# Prior to 4.2.1, the time spent by the user on an HTTPS / SSL session
was not recorded
in the Access Log. From 4.2.1 the CONNECT requests will be
appropriately logged.

# New variables for use in Custom Templates and External Parsers, are
being introduced.

SafeSquid 4.2.1 and later versions would be -

# compatible to systems running 64bit operating systems

# easily installable on all Linux distros, without the inconvenience
of locating
and fixing the ssl libraries.

To know more about SafeSquid 4.2.1, please visit the link -