My off the cuff guess is that your ISP is running a so called transparent proxy. (Cox?) Also, it sounds like this server is under your control. If so, you should be able to configure your web server to use HTTP to prevent the caching. I've linked to the w3 doc for 1.1, look for the section 14.9 Cache-Control which includes a comment on Pragma: no-cache for HTTP 1.0

There are ways to probe the caches and figure out what is going on but I believe that cache-control should do the trick. The next step is less easy.

https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

In reply to Re^3: [OT] HTTP downloads and caching by Anonymous Monk
in thread [OT] HTTP downloads and caching by syphilis

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