New version of Tinyproxy. Upstream connection working so requests get anonymized and replies cached. Use anonymous.pac or port 8080. New Caching proxy Oops running on port 8888.
Load balancing is done between squid and oops.
Problem with POST requests filtered by Tinyproxy solved. New version installed. Tinyproxy works again on port 8080. All headers are filtered - cookies too, and destination domain filtering is enabled. Send me your proposals what to filter.