943 bytes that answer HTTP

📰 Dev.to · arcker

Build a tiny HTTP server in 943 bytes using Verbose, a self-compiling language, and understand the importance of atomic logging

advanced Published 2 Aug 2026

Action Steps

Build a Verbose compiler using its own codebase
Compile a Verbose program to emit an HTTP server ELF
Run the resulting ELF to test the HTTP server functionality
Configure the server to route requests based on method and path
Test the logging mechanism to ensure atomic writes

Who Needs to Know This

Developers and system engineers can benefit from this knowledge to create efficient and secure HTTP servers, and understand the low-level details of networking and logging

Key Insight

💡 Atomic logging is crucial to prevent log line splitting and ensure data integrity

Key Takeaways

Build a tiny HTTP server in 943 bytes using Verbose, a self-compiling language, and understand the importance of atomic logging

Full Article

Verbose is a small proof-carrying language whose compiler is written in itself. It now emits HTTP servers: a 943-byte ELF that opens a socket, parses the request, routes on method and path, and writes its access log in a single atomic writev. Here is the whole syscall chain, end to end — and why a log line must never be splittable in two.

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