May 26, 2018

Snap: A Haskell Web Framework (core interfaces and types)

Snap is a simple and fast web development framework and server written in Haskell. This library contains the core definitions and types for the Snap framework, including

  1. Primitive types and functions for HTTP requests, responses, cookies, post/query parameters, etc.

  2. Type aliases and helper functions for Iteratee I/O.

  3. A monad for programming web handlers called “Snap”, inspired by happstack’s, which allows

    • Stateful access to the HTTP request and response objects.

    • Monadic failure i.e. MonadPlus/Alternative instances for declining to handle requests and chaining handlers together.

    • Early termination of the computation if you know early what you want to return and want to prevent further monadic processing.

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