New Module: Modular HTTP Client

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Modular HTTP Cache Library Implementation

In today's fast-paced web development landscape, caching is a crucial aspect of improving application performance and reducing latency. However, implementing a robust caching system can be a daunting task, especially when dealing with different environments and frameworks. To address this challenge, we introduce the Modular HTTP Client, a comprehensive caching library designed to be modular, flexible, and highly customizable.

Core Requirements (Foundation)

1. Cache Key System

A well-designed cache key system is the foundation of a reliable caching engine. Our Modular HTTP Client addresses this requirement by providing a robust cache key generation system that takes into account the following factors:

  • URL normalization: Our system normalizes URLs by handling query parameters, hostnames, and trailing slashes.
  • Content-Type normalization: We normalize Content-Type headers to ensure consistent cache key generation.
  • Deterministic cache key generation: Our system generates cache keys deterministically, ensuring that the same input always produces the same output.
  • Support for Vary header processing: We support Vary header processing, allowing for more fine-grained cache key generation.

2. HTTP Cache Semantics

Our Modular HTTP Client also implements the HTTP cache semantics as specified in RFC 9110. This includes:

  • Freshness calculation: We calculate freshness based on max-age, s-maxage, and Expires headers.
  • Age determination: Our system determines the age of a response based on the Age header and the current date.
  • Cache directive parsing: We parse Cache-Control directives to determine cache behavior.
  • ETag/Last-Modified handling: We handle ETag and Last-Modified headers to ensure accurate cache key generation.
  • 304 Not Modified processing: Our system handles 304 Not Modified responses correctly, ensuring that the cache is updated accordingly.

3. Storage Interface

Our Modular HTTP Client defines a storage interface that provides a standardized way of interacting with different storage adapters. The storage interface includes the following methods:

  • get(key: string): Retrieves a cache entry from storage based on the provided key.
  • set(key: string, entry: CacheEntry): Stores a cache entry in storage based on the provided key and entry.
  • delete(key: string): Deletes a cache entry from storage based on the provided key.
  • keys(): Returns an array of all cache keys stored in the adapter.

Implementation Domains (Separable)

Our Modular HTTP Client is designed to be modular, allowing developers to implement different components independently. The implementation domains include:

A. Storage Implementations

We provide three storage implementations:

  • Memory Storage: A simple in-memory storage adapter that works everywhere.
  • Filesystem Storage: A storage adapter that uses the filesystem to store cache entries. This implementation is specific to Deno and Node.js.
  • Browser Storage: A storage adapter that uses IndexedDB to store cache entries. This implementation is specific to web browsers.

B. Framework Integration

Our Modular HTTP Client provides framework-specific adapters to make it easy to integrate with popular frameworks. The adapters include:

  • Fetch Wrapper: A wrapper around the standard fetch API that provides a familiar API for working with the caching engine.
  • Express/Koa Adapter: A middleware adapter for Express and Koa that integrates the caching engine with these frameworks.
  • Axios-like Interface: An adapter that provides an Axios-like interface for working with the caching engine.

C. Configuration Systems

Our Modular HTTP Client provides a configuration system that allows developers to customize cache behavior. The configuration system includes:

  • Route-Based Configuration: A configuration system that allows developers to configure cache behavior on a per-route basis.
  • Runtime Configuration: A configuration system that allows developers to configure cache behavior globally or override specific settings.

Progressive Work Items

Our Modular HTTP Client is designed to be developed in a progressive manner, with each phase building on the previous one. The progressive work items include:

Phase 1: Core Foundation

  • Cache key generation system: Implement the cache key generation system, including URL normalization, query parameter handling, and Content-Type normalization.
  • HTTP cache semantics: Implement the HTTP cache semantics, including freshness calculation, age determination, and cache directive parsing.
  • Basic in-memory storage adapter: Implement a basic in-memory storage adapter that provides a simple way to store and retrieve cache entries.

Phase 2: Extended Storage

  • Filesystem adapter: Implement a filesystem adapter that uses the filesystem to store cache entries.
  • IndexedDB adapter: Implement an IndexedDB adapter that uses IndexedDB to store cache entries.
  • Quota management: Implement quota management for the IndexedDB adapter.

Phase 3: Configuration & Routing

  • Route configuration interface: Implement a route configuration interface that allows developers to configure cache behavior on a per-route basis.
  • Default configuration system: Implement a default configuration system that provides a simple way to configure cache behavior globally.
  • Hierarchy of settings: Implement a hierarchy of settings that allows developers to override specific settings.

Phase 4: Framework Integration (Optional)

  • Fetch wrapper implementation: Implement a fetch wrapper that provides a familiar API for working with the caching engine.
  • Framework adapters: Implement framework adapters for Express, Koa, and other popular frameworks.

Success Criteria

Our Modular HTTP Client is designed to meet the following success criteria:

Core Library

  • Zero dependencies: The core library should have zero dependencies.
  • Isomorphic: The core library should work in all environments.
  • Full HTTP caching compliance: The core library should comply with the HTTP caching specification (RFC 9110).
  • TypeScript definitions: The core library should provide TypeScript definitions.
  • < 5KB minified+gzipped: The core library should be smaller than 5KB when minified and gzipped.

Storage Adapters

  • Consistent interface: The storage adapters should provide a consistent interface.
  • Environment-appropriate implementations: The storage adapters should be implemented in a way that is appropriate for each environment.
  • Configurable persistence options: The storage adapters should provide configurable persistence options.

Configuration System

  • Simple defaults: The configuration system should provide simple defaults.
  • Extensible for complex scenarios: The configuration system should be extensible for complex scenarios.
  • Route-specific behavior: The configuration system should allow for route-specific behavior.

Framework Integration

  • Drop-in compatibility with existing code: The framework integration should provide drop-in compatibility with existing code.
  • Familiar API patterns: The framework integration should provide familiar API patterns.
  • Framework-specific optimizations: The framework integration should provide framework-specific optimizations.

Dependencies Between Components

Our Modular HTTP Client is designed to be modular, with each component depending on the core library. The dependencies between components are as follows:

  • Core Cache Engine: Depends on the storage interface definition.
  • Storage Interface Definition: Depends on the core cache engine.
  • Memory Storage Implementation: Depends on the core cache engine.
  • Filesystem Storage Implementation: Depends on the core cache engine.
  • Browser Storage Implementation: Depends on the core cache engine.
  • Configuration System: Depends on the core cache engine.
  • Route Configuration: Depends on the configuration system.
  • Fetch Wrapper: Depends on the core cache engine and storage interface.
  • Express/Koa Adapter: Depends on the core cache engine and configuration system.
  • Axios-like Interface: Depends on the core cache engine and configuration system.

Frequently Asked Questions

Q: What is the Modular HTTP Client?

A: The Modular HTTP Client is a comprehensive caching library designed to be modular, flexible, and highly customizable. It provides a robust cache key generation system, implements the HTTP cache semantics, and offers a storage interface that allows developers to interact with different storage adapters.

Q: What are the benefits of using the Modular HTTP Client?

A: The Modular HTTP Client offers several benefits, including:

  • Improved performance: By caching frequently accessed resources, the Modular HTTP Client can significantly improve application performance.
  • Reduced latency: The caching engine can reduce latency by serving cached responses instead of making new requests.
  • Increased scalability: The Modular HTTP Client can handle high traffic and large datasets, making it an ideal choice for scalable applications.
  • Flexibility: The library is designed to be modular, allowing developers to implement different components independently.

Q: What are the different storage adapters available in the Modular HTTP Client?

A: The Modular HTTP Client provides three storage adapters:

  • Memory Storage: A simple in-memory storage adapter that works everywhere.
  • Filesystem Storage: A storage adapter that uses the filesystem to store cache entries. This implementation is specific to Deno and Node.js.
  • Browser Storage: A storage adapter that uses IndexedDB to store cache entries. This implementation is specific to web browsers.

Q: How do I configure the caching engine?

A: The Modular HTTP Client provides a configuration system that allows developers to customize cache behavior. The configuration system includes:

  • Route-Based Configuration: A configuration system that allows developers to configure cache behavior on a per-route basis.
  • Runtime Configuration: A configuration system that allows developers to configure cache behavior globally or override specific settings.

Q: Can I use the Modular HTTP Client with my favorite framework?

A: Yes, the Modular HTTP Client provides framework-specific adapters to make it easy to integrate with popular frameworks. The adapters include:

  • Fetch Wrapper: A wrapper around the standard fetch API that provides a familiar API for working with the caching engine.
  • Express/Koa Adapter: A middleware adapter for Express and Koa that integrates the caching engine with these frameworks.
  • Axios-like Interface: An adapter that provides an Axios-like interface for working with the caching engine.

Q: How do I get started with the Modular HTTP Client?

A: To get started with the Modular HTTP Client, follow these steps:

  1. Install the library using npm or yarn.
  2. Import the library in your project.
  3. Configure the caching engine using the configuration system.
  4. Use the caching engine to cache resources.

Q: What are the system requirements for the Modular HTTP Client?

A: The Modular HTTP Client has the following system requirements:

  • Node.js: The library requires Node.js 14 or later.
  • Deno: The library requires Deno 1.0 or later.
  • Web browsers: The library requires a web browser that supports IndexedDB.

Q: Is the Modular HTTP Client open-source?

A: Yes, the Modular HTTP Client is open-source and available on GitHub.

Q: Can I contribute to the Modular HTTP Client?

A: Yes, we welcome contributions to the Modular HTTP Client. Please submit a pull request or issue on GitHub.

Q: What is the license for the Modular HTTP Client?

A: The Modular HTTP Client is licensed under the MIT License.

Q: How do I report bugs or issues with the Modular HTTP Client?

A: To report bugs or issues with the Modular HTTP Client, please submit an issue on GitHub.

Q: Can I use the Modular HTTP Client in production?

A: Yes, the Modular HTTP Client is designed for production use and has been tested in various environments.

Q: How do I get support for the Modular HTTP Client?

A: For support, please submit a ticket on GitHub or contact us through our website.