Routing in Snap

In this recipe, we will add routes using the Snap Framework. We will add plain routes and routes with parameters.

How to do it...

1. Create a new project, routing-in-snap, with a simple stack template. We use lts-9.1 as a resolver package archive. You can use the latest one available on Stackage. Just make sure that you use the same resolver later to solve the dependency constraints:

        stack --resolver lts-9.1 new routing-in-snap simple

2. Add a dependency on the following libraries in the build-depends subsection of the executable section, as follows:

        executable routing-in-snap
        hs-source-dirs:      src
        main-is:             Main.hs
        default-language:    Haskell2010
        build-depends:       base >= 4.7 && < 5
                       , snap-server
                       , snap-core
                       , snap
                       , lens
                       , bytestring
                       , text

3. Use the following command to...