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Squid...
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Expanded log format beautify

  tail -fn1 /app/squid/log/access.log |
    sed 's/$/\n/;s/ \([a-z_]*=\)/\n  \1/g'

Simplify output
  tail -fn0 /app/squid/log/access.log |
    sed -u 's/$/\n/;s/ \([a-z_]*=\)/\n  \1/g' |
    egrep --line-buffered ' (local_time|src_ip|url|vendor_action|status)=|^$'

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squidclient

  squidclient mgr:storedir     # summery of storeage directories

  squidclient mgr:objects      # detailed info of stored objects

  squidclient mgr:objects |
    grep  GET |
      grep -v squid-internal |
        tee cached_urls.txt    # summery of objects in cache

If allowed using
  acl PURGE method PURGE
  http_access deny PURGE !localhost
You can purge objects using
  squidclient -m PURGE URL


Vendor Action Meanings...
https://forums.ivanti.com/s/article/Squid-Caching-Proxy-Access-log-Explained

TCP_*              Refers to requests on the HTTP port (3128)

TCP_MEM_*          Referse to memory Cache rather than disk cache

*_HIT              A copy of the requested object was returned from cache.

*_MISS             The requested object was not in the cache. Downloaded

TCP_REFRESH_HIT    An expired copy of the requested object was in the cache.
                   Squid made an If-Modified-Since request and the response
                   was "Not Modified."

TCP_REFRESH_FAIL_HIT    Ditto..  But the If-Modified-Since request failed
                   So the old (stale) object was returned.

TCP_REFRESH_MISS   Ditto... But If-Modified-Since request got a new object.

TCP_REFRESH_UNMODIFIED  ????

TCP_CLIENT_REFRESH The client issued a "no-cache" pragma. Handle as MISS

TCP_IMS_HIT        If-Modified-Since GET request from client returned cahced. 

TCP_IMS_MISS       Ditto but result was stale.  Get new object.

TCP_SWAPFAIL       Cached object should be in cache but wasn't.

TCP_DENIED         Access was denied for this request.

TCP_TUNNEL         A binary tunnel was established.

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