https://scrapfly.dev/Recent content on scrapfly.devHugo -- gohugo.ioen-usSun, 12 Jul 2026 00:00:00 +0000https://scrapfly.dev/posts/browser-math-os-fingerprint/Sun, 12 Jul 2026 00:00:00 +0000https://scrapfly.dev/posts/browser-math-os-fingerprint/Math.tanh, every CSS trig function, and the Web Audio compressor all route through the host libm, so the rounding of a cosine betrays the OS a browser actually runs on. Where the leak lives across V8, Blink, and Web Audio, and what bit-for-bit reproduction of Apple’s math library takes to close it.https://scrapfly.dev/posts/browser-hyphenation-os-fingerprint/Sun, 12 Jul 2026 00:00:00 +0000https://scrapfly.dev/posts/browser-hyphenation-os-fingerprint/CSS hyphens:auto uses a per-language dictionary, and macOS and Windows/Linux Chrome ship disjoint dictionary sets from two different engines. Which languages a browser will hyphenate, and where it breaks them, classifies the OS with one DOM read. Why closing it for a macOS profile means reverse-engineering Apple’s CFBurstTrie format and reconstructing its hyphenation bit-for-bit.https://scrapfly.dev/posts/audio-fingerprint-math/Fri, 12 Jun 2026 00:00:00 +0000https://scrapfly.dev/posts/audio-fingerprint-math/The audio fingerprint stopped separating browsers and now separates CPUs: x86 and Apple Silicon build the oscillator wavetable with different FFTs. Why per-session noise cannot hide a 1-to-22-ULP gap, and what reproducing Apple’s vDSP FFT on x86 down to a double-precision base case actually involves.https://scrapfly.dev/about/Wed, 20 May 2026 00:00:00 +0000https://scrapfly.dev/about/About scrapfly.dev, the engineering blog of Scrapfly.https://scrapfly.dev/posts/wasm-cpu-architecture-leak/Tue, 12 May 2026 00:00:00 +0000https://scrapfly.dev/posts/wasm-cpu-architecture-leak/WebAssembly is deterministic except for NaN bit patterns and relaxed SIMD, and both leak whether the CPU underneath is ARM or x86. How a browser claiming Apple Silicon on an x86 server gets caught by a 30-byte module, and how to emit ARM’s bits across every V8 compiler tier.https://scrapfly.dev/posts/cdp-cbor-msgpack-snappy/Sun, 12 Apr 2026 00:00:00 +0000https://scrapfly.dev/posts/cdp-cbor-msgpack-snappy/How a single CDP message travels through three different serialization formats between Scrapium (our stealth-patched Chromium build) and our scraping infrastructure, what each format is doing for us, the UTF-8 vs UTF-16 trap that lives at the CBOR layer, and a production case our monitoring caught that taught us our two implementations did not agree on what a ‘string’ was.