werkzeug German noun: "tool". Etymology: werk ("work"), zeug ("stuff")

Werkzeug is a comprehensive WSGI web application library. It began as a simple collection of various utilities for WSGI applications and has become one of the most advanced WSGI utility libraries.

It includes:

• An interactive debugger that allows inspecting stack traces and source code in the browser with an interactive interpreter for any frame in the stack.
• A full-featured request object with objects to interact with headers, query args, form data, files, and cookies.
• A response object that can wrap other WSGI applications and handle streaming data.
• A routing system for matching URLs to endpoints and generating URLs for endpoints, with an extensible system for capturing variables from URLs.
• HTTP utilities to handle entity tags, cache control, dates, user agents, cookies, files, and more.
• A threaded WSGI server for use while developing applications locally.