Besticon is a Go-based application and library designed to discover and generate website icons (favicons, apple-touch-icons, etc.). It functions as a monolithic service that can be deployed as a web server, a CLI tool, or imported as a library. The core logic scans HTML for icon links, parses .ico files, extracts dominant colors from images, and generates letter-based placeholder icons when no icons are found. It exposes an HTTP API with endpoints for icon fetching and a web UI for demonstration. The architecture separates concerns into a core library (`besticon`), a command-line interface (`besticon/cmd.go`), and a web server (`iconserver`). The server integrates Prometheus metrics for observability and implements SSRF protection to prevent security vulnerabilities during external HTTP requests. The codebase utilizes Go's standard library for image processing and HTML parsing, with external dependencies for caching (`groupcache`) and metrics (`prometheus`). A notable engineering practice is the use of VCR (Video Cassette Recorder) cassettes for testing HTTP interactions, allowing deterministic testing without live network access. The project also employs the functional options pattern for configuration, ensuring a clean API for the library consumers. However, the `go.mod` file specifies a future Go version (1.26), which indicates a configuration anomaly that may hinder standard builds.