# Table of contents

- [High level features](#high-level-features)
- [Compatibility](#compatibility)
- [Handlers](#handlers)
    - [Debugging handler type errors](#debugging-handler-type-errors)
- [Routing](#routing)
    - [Wildcard routes](#wildcard-routes)
    - [Nesting routes](#nesting-routes)
    - [Fallback routes](#fallback-routes)
    - [Routing to any `Service`](#routing-to-any-service)
        - [Routing to fallible services](#routing-to-fallible-services)
- [Extractors](#extractors)
    - [Common extractors](#common-extractors)
    - [Applying multiple extractors](#applying-multiple-extractors)
    - [Optional extractors](#optional-extractors)
    - [Customizing extractor responses](#customizing-extractor-responses)
- [Building responses](#building-responses)
- [Error handling](#error-handling)
- [Applying middleware](#applying-middleware)
    - [To individual handlers](#to-individual-handlers)
    - [To groups of routes](#to-groups-of-routes)
    - [Applying multiple middleware](#applying-multiple-middleware)
    - [Commonly used middleware](#commonly-used-middleware)
    - [Writing your own middleware](#writing-your-own-middleware)
- [Sharing state with handlers](#sharing-state-with-handlers)
- [Required dependencies](#required-dependencies)
- [Examples](#examples)
- [Feature flags](#feature-flags)