Obsolete pages and VirtualBox
There is one other possible problem that manifests itself as users (or, more frequently, developers) seeing old versions of web pages in HTTP responses. There is a bug in VirtualBox virtualization software, which is very popular as a development virtualization solution (for example, with Vagrant or, more lately, Otto). VirtualBox is also sometimes used as a production virtualization technology. It has a feature named "shared folders", which allows it to have a copy of the host machine folder inside one of the guest machines.
The bug is in the handling of the sendfile() Linux kernel syscall inside VirtualBox. This syscall directly copies a file to a TCP socket, avoiding extra unneeded memory copies and providing all ...
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