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Pcore-HTTP

     
11:40 pm on Jul 7, 2016 (gmt 0)

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UA: Pcore-HTTP/v0.23.20
Protocol: HTTP/1.1
Robots.txt: No
Host: Various

One of the many HTTP clients run from a server to GET remote files. Thought it worth documenting since the UA string does not begin with "HTTP" like most others.
8:24 pm on Oct 15, 2016 (gmt 0)

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WebmasterWorld Administrator not2easy is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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This thing has been updated and it is a real pain when you find it in your logs. It is now "Pcore-HTTP/v0.24.5" and from 14/Oct/2016:20:24:32 to 14/Oct/2016:23:41:56 it requested 0ver 2,900 image files from 150 different IPs. I have added this UA to my go away list.
6:17 pm on Nov 16, 2016 (gmt 0)

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WebmasterWorld Senior Member lucy24 is a WebmasterWorld Top Contributor of All Time 5+ Year Member Top Contributors Of The Month

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Pcore is one of a large group of robots that I only became aware of after adding files to a reputable directory: robots that don't do top-to-bottom crawls beginning with the front page, but only request files that are linked from elsewhere. Since they have never asked for robots.txt, I have never had occasion to poke a hole for them, and hence don't even know which particular header, or lack thereof, leads them to be blocked.

If it weren't for the request pattern--typically 6 requests for various files in the same directory within about 30 seconds--I might have suspected it's yet another open-source UA that anyone and everyone can use.
7:54 pm on Nov 16, 2016 (gmt 0)

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another open-source UA that anyone and everyone can use
Yes, you can pick up a copy at several repositories like gethub, so you may see this UA coming from various IP ranges.