Server applications, and in particular network-based server applications, place a unique
combination of demands on a programming language: lightweight concurrency, high I/O
throughput, and fault tolerance are all important. This paper describes a prototype web
server written in Concurrent Haskell (with extensions), and presents two useful results: firstly,
a conforming server could be written with minimal effort, leading to an implementation in
less than 1500 lines of code, and secondly the naive implementation produced reasonable
performance. Furthermore, making minor modifications to a few time-critical components
improved performance to a level acceptable for anything but the most heavily loaded web
servers.