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• Disallow code usage with a custom `clippy.toml`

  I recently discovered that adding a clippy.toml file to the root of a Rust project gives the ability to disallow a method or a type when running cargo clippy. This has been really useful. I want to share two quick ways that I’ve used it: Enhancing std::fs calls via fs_err and protecting CWD threadsafety in tests.

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• Learn How to Lower Heroku Dyno Latency through Persistent Connections (Keep-alive)

  Before the latest improvements to the Heroku Router, every connection between the router and your application dyno risked incurring the latency penalty of a TCP slow start. To understand why this is a performance bottleneck for modern web applications, we must look at the fundamentals of the Transmission Control Protocol (TCP) and its history with HTTP.

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• 'Our app supports Markdown' and other lies apps tell

  I’ll make this plain and simple: If your app does not let me read back, the character-for-character raw text I put into the editor, it does NOT support markdown.

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• Don't McBlock me

  “That cannot be done.” Is rarely true, but it’s a phrase I’ve heard more and more from technical people without offering any rationale or further explanation. This tendency to use absolute language when making blocking statements reminded me of a useful “McDonald’s rule” that I was introduced to many years ago when deciding where to eat with friends. It goes something like this:

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• Bad Type Patterns - The Duplicate duck

  Why aren’t people writing more types? Perhaps it’s because the intermediate and expert developers deleted the patterns that didn’t work and left no trace for beginners to learn from. This post details some code I recently deleted that has a pattern I call the “duplicate duck.” You can learn the process I used to develop the type, and why I deleted it. Further, I advocate for Rust developers to document and share their mistakes in the hope that we can all learn from them.

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