Oops
Oops is a caching web
proxy that uses one thread (lightweight process) for every connection.
This technique does cost additional memory, but allows good
concurrency of requests while avoiding the need for complex
non-blocking programming. Oops was apparently designed as a
wide-scale shared proxy.
Although Oops' programming model makes it easy to implement persistent
connections, Oops insists on opening a separate connection to the
server for every single resource fetch, which disqualifies it from
production usage.