Usually when programming we call a public api on an object and the real works are being done. We don’t know exactly what happen under the hood. Imagine you read a file, you call fopen or fseek but that’s that. Who move the hard drive tip? who fetch the data from hard drive and put it to memory so your program can access it? The way to know that is working directly with the protocol instead of relying on the SDK. Today, we do the same with Bitcoin. It’s written by Tesla AutoPilit director

At some point in your career, you have to deal with slow queries and would wish a way to print out those queries so you can identify a pattern.

After an almost stellar 2 year uptime, on 22nd of June, bunny.net experienced a 2+ hour near system-wide outage caused by DNS failure. In a blink of an eye, we lost over 60% of traffic, and wiped out hundreds of Gbits of throughput. Despite all of these systems being in place, a very simple update brought it all crumbling down, affecting over 750.000 websites.

in 2010 the iPhone 4 came out, and the screen was 640×960, whereas the similar-sized iPhone 3 was 320×480. The resolution doubled, while the screen size was roughly the same, so in effect the screen density doubled. Apple couldn’t just run the same apps but at a higher resolution, because things like text and buttons would be tiny, so they doubled the size of everything. 1 pixel became 2 ‘device pixels’. On the web we call this the ‘device pixel ratio’, or DPR. The iPhone 4 had a DPR of 2. This is sometimes referred to as having a 2x screen, or 2dppx. So you see the mess?

How do you sort this ‘Bären’, ‘Käfer’, ‘küssen’, ‘Ähnlich’, ‘Äpfel’ with built-in sorting in your language? In JavaScript B will be the first where as Ähnlich is the right one

Simply change the user-agent of device just trick simple system. But it isn’t simple like that because a device also share many information such as screensize. And these parameters can be used to figured out the real device model.

WallStreetBets and the Gamestop incident causes spike in Reddit traffic and cause internal dependency failure cascaded as the core systems started degrading due to the database performance issues.

Despite Rails in its title, it can apply to any software stack. Check out the previous injection attack too

Despite Django in its title, you can just ignore and read all of the title, they will apply to your own SaaS or startup app.

Probably not need in our daily life but it’s great to know the language and toolchain available. Plus, I imagine it’s quite fun to write a parser to parse a language