Best Practices For Documenting DIY Proxy Projects
When developing your own proxy solution, detailed records are crucial — not only for your own future reference but for any team member or maintainer who inherits the project. Begin with a clear statement of intent. Justify the need for this solution, the specific challenge it overcomes, and the types of requests it processes. This context helps future readers quickly grasp the intent behind the design.
Proceed to map out the system structure. Describe each component — including code modules, ini files, virtual machines, or cloud endpoints — and how they communicate. Supply schematic illustrations, even basic sketches scanned and embedded as PNGs. Identify sources, destinations, and transformation stages. Don’t assume that the code is self explanatory, because source evolves, but clear notes endure.
Record all third-party tools and their specified versions. If you’re using Python libraries, Node modules, or system packages, write them down with exact versions. Provide step-by-step setup commands. Mention any environment variables or configuration files required, and offer concrete values annotated with their purpose and impact.
Record how to start, stop, and restart the proxy. Include any startup commands, necessary privileges, and common pitfalls like port conflicts or missing certificates. If logging is enabled, detail the log directory, and the significance of debug, info, warn, and error. Add annotated log snippets showing normal vs. abnormal behavior.
Protecting the system is non-negotiable. Detail all access control methods, whether you’re using password, OAuth2, or client certs. Note how secrets are stored — loaded via OS vars, encrypted with GPG, or embedded in binary?. If you’re routing traffic through external services, mention which ones and how data privacy is handled. Never allow admin panels or debug routes to be publicly accessible.
Add a dedicated FAQ section. List common errors you’ve encountered and how you resolved them. Such as: when clients send invalid User-Agent strings, the server segfaults — check for null headers in the parser, then add input sanitization — this saves hours for someone else debugging the same issue.
Make documentation a living artifact. Integrate it into your dev process — revise it alongside each commit, PR, or deployment. Store docs in the same repo as the code so updates are versioned with commits. Even if you’re the only person using the proxy now, your future self will be grateful for the detail.
