Duration: 2005-ongoing

Contact Person: Univ.-Prof. Dr. Gustaf Neumann

NaviServer is a programmable web server written in C and Tcl. It offers many features for building custom web sites. The implementation is high performance, but the interface is easy to use, at both the C and Tcl level.

Features include:

• Hybrid multi-threaded / async architecture for easy programmer interface and high performance
• Threads isolated from each other with own Tcl interpreters [1]
• Shares data between threads easily with protected variables and caches[2]
• Pooled database connections[3] (also: nsdbi)
• Dynamic Pages in TCL [4] (PHP- and ASP-like syntax)
• Built-in cron-like scheduling
• Watchdog for restarting server
• Efficient handling for large up- and downloads (spooling and writer threads)
• Optional non-blocking log file writing (to avoid file system latencies, since 4.99.4)
• Fully async drivers for HTTP and SSL (based on poll(), supporting several 1000 file descriptors, since 4.99.4)
• Gzipped delivery of dynamic and static content (since 4.99.5)
• Support for IPv6 (since 4.99.11)
• Integrated support for HTTPs (since 4.99.12, was an extra module called [nsssl] before)
• Native crypto support based on OpenSSL (since 4.99.12, including HMAC, message digests, HOTP (RFC 6238 one time passwords), TOTP (RFC 6238 time based one time passwords)
• Reverse proxy (since 4.99.14, via modules revproxy)
• Dynamic thread pool mapping (since 4.99.15)
• Caching with transaction semantics, rollback changes in cache when e.g. DB rollbacks occur (since 4.99.16)
• Tcl configuration file[5]
• and much, much more..!

Runs (and is tested regularly) on: Linux, Solaris, MacOS X. Also runs on FreeBSD and Windows[6], [7].

For more information: website