Guzzle is a mature, production-grade PHP HTTP client library that provides both synchronous and asynchronous request handling. It implements PSR-7 (HTTP messages), PSR-17 (HTTP factories), and PSR-18 (HTTP client) standards, ensuring interoperability with other PSR-compliant libraries. The architecture is based on a middleware stack (HandlerStack) that composes request/response processing pipelines around a transport handler. Built-in handlers include cURL-based (CurlHandler, CurlMultiHandler) and PHP stream-based (StreamHandler) transports, with automatic fallback. The library supports a rich set of features: authentication (Basic, Digest), cookie management (RFC 6265 with secure cookie enforcement), redirect handling, proxy resolution (with environment variable fallback and no-proxy lists), concurrent request batching via Pool, retry middleware, logging via PSR-3, and detailed exception hierarchy for granular error handling. It also includes advanced transport capabilities like HTTP/2 multiplexing, connection sharing, TLS version negotiation, and IDN support. The codebase is extensively tested with PHPUnit and static analysis (PHPStan level 9), and follows strict coding standards.
MooTool is a cross-platform developer toolbox with over 30 utilities including JSON formatting, HTTP client, regex testing, encryption/decryption, color picker, diff viewer, QR code, cron expressions, translation, image processing, PDF manipulation, code runtime, and more. The repository contains three concurrent implementations: a legacy Java Swing desktop application (with FlatLaf theming and MyBatis/SQLite persistence), an Electron+React+TypeScript rewrite (using CodeMirror, pdf-lib, and native IPC bridges), and a Tauri 2 (Rust+React) version with additional native features like screen capture, system tray, and updater integration. A macOS native SwiftUI app is also provided as a preview. The architecture is modular per tool, with shared contracts across platforms, session tracking, operation history, and vault-based note storage with Git versioning. Key entry points include the Java MainFrame, the Electron main process (electron/main/index.ts), and the Tauri Rust backend commands. Data flows are entirely local (SQLite, file vault, settings JSON) with no cloud dependency except automated translation APIs and optional update checks. External dependencies include Java runtime, Git, protoc, Tesseract OCR, system keyring, and translation web services (Google, Bing).