When working on a DIY proxy project, comprehensive notes are indispensable — not merely to help you later but as well as for collaborators, contributors, or future developers. First, define the core objective of your proxy. Explain why you built it, the specific challenge it overcomes, and what kind of traffic it handles. This context helps future readers quickly grasp the intent behind the design.

Proceed to map out the system structure. Break down every element — be it a Python script, YAML config, Docker container, or external API — and how they communicate. Supply schematic illustrations, even basic sketches scanned and embedded as PNGs. Label inputs, outputs, and data flows. Don’t assume that the code is self explanatory, because deployments shift, yet explanations remain constant.

List all dependencies and their versions. Whether you rely on pip packages, npm modules, or apt binaries, specify precise semantic versions. Detail the installation process from scratch. Note all.env keys or config.ini settings, and provide example values with explanations of what each one does.

Record how to start, stop, and restart the proxy. Provide the exact terminal instructions, admin-level access, and common pitfalls like port conflicts or missing certificates. When logs are generated, specify their location, and the significance of debug, info, warn, and error. Include examples of typical log entries and what they indicate about system health.

Security must be prioritized. Document any authentication mechanisms, whether you’re using basic auth, tokens, or certificates. Reveal your key storage approach — stored in.env, wrapped in Vault, or buried in source?. 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. For example, if the proxy crashes when a client sends malformed headers, describe the symptom, the log message you saw, and the fix you applied — this cuts down read more on hackmd.io frantic Google searches.

Treat docs as critical code. Embed it in your pull request checklist — refresh it whenever logic, config, or endpoints shift. Track changes in Git alongside source files so changes are tracked alongside the code. Even if you’re the only person using the proxy now, your future self will be grateful for the detail.