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What I'm seeing is a regular UA but it doesn't always get images. It starts out normal but ends with no images. It does this at a "human rate" and doesn't take very many pages. I see this from different IPs and they always go to different parts of the site, just like normal.
Another normal UA I see seems to be multi threaded in that it gets 2 pages in the same second. Sometimes the pages are the same page called twice and other times it calls default and the second page called is different, but at the same second.
Clear as mud I know.
Are these web accelerators? Or bots or browsers with the images disabled or am I just looking at log files too much?
There's some old threads on a few of these