Last Updated on April 14, 2026
rwasa is billed as a full-featured, high performance, scalable web server designed to compete with the likes of nginx.
It has been built from the ground-up with no external library dependencies entirely in x86_64 assembly language, and is the result of many years’ experience with high volume web environments. In addition to all of the common things you’d expect a modern web server to do, we also include assembly language function hooks ready-made to facilitate Rapid Web Application Server (in Assembler) development.
This is free and open source software.
Key Features
- Entirety hand-written in x86_64 assembly language.
- Faster than nginx for most environments.
- Commercial support available.
- TLS auto-blacklisting for anti-tampering.
- OCSP Stapling by default.
- Randomized Diffie-Hellman safe prime pool.
- Multi-process lockless TLS session resumption cache.
- TLS session cache is encrypted by default.
- Faster dynamic content compression.
- Large-scale FastCGI safely via unix sockets (without hitting EAGAIN).
- Large-scale backpath (aka upstream) safely via unix sockets.
- Simple command-line arguments covers all common configurations.
- Small footprint, no external dependencies.
- Server-side BREACH mitigation.
- HSTS enabled by default.
Website: 2ton.com.au/rwasa
Support:
Developer: Ton Digital
License: GNU General Public License v3.0
Related Software
| Web Servers | |
|---|---|
| nginx | Very powerful and efficient web server powering the top web sites |
| Apache | Like nginx, Apache is a hugely popular web server |
| Caddy | Powerful, enterprise-ready web server written in Go |
| Lwan | Experimental, scalable, high performance HTTP server |
| H2O | Optimized HTTP/1.x, HTTP/2, HTTP/3 server |
| Tengine | Distribution of nginx |
| lighttpd | Fast, compliant and very flexible low memory footprint web server |
| Ferron | Web server optimized for speed, security and efficiency |
| Angie | Scalable web server that was forked from nginx |
| Algernon | Small self-contained pure-Go web server |
| Node.js | Server-side JavaScript environment for network applications |
| Hiawatha | Web server that focuses on security |
| OpenLiteSpeed | Lightweight HTTP server |
| rwasa | Full-featured high performance web server |
| devd | Local web server for developers |
| Cherokee | Fast, flexible and embeddable web server |
Read our verdict in the software roundup.
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