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

Snap is a simple and fast web development framework and server written in Haskell. For more information or to download the latest version, you can visit the Snap project website at http://snapframework.com/.

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. A monad for programming web handlers called "Snap", 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

Quick start: The Snap monad and HTTP definitions are in Snap.Core.

Snap Framework Core

Snap is a web framework for Haskell. For more information about Snap, read the README.SNAP.md or visit the Snap project website at http://www.snapframework.com/.

Library contents

This is the snap-core library, which contains:

• primitive types and functions for HTTP (requests, responses, cookies, post/query parameters, etc).

• a "Snap" monad interface for programming web handlers, 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.

• useful utilities for web handlers, like file serving and gzip/zlib compression.

Building snap-core

The snap-core library is built using Cabal and Hackage. Just run

cabal install

from the snap-core toplevel directory.

Building the Haddock Documentation

The haddock documentation can be built using the supplied haddock.sh shell script:

./haddock.sh

The docs get put in dist/doc/html/.

Building the testsuite

Snap aims for 100% test coverage, and we're trying hard to stick to that.

To build the test suite, configure with --enable-tests:

$ cabal configure --enable-tests
$ cabal build

From here you can invoke the testsuite by running:

$ ./runTestsAndCoverage.sh

The testsuite generates an hpc test coverage report in dist/hpc.