Form handling in Snap

In this recipe, we will look at how forms can be handled in the Snap Framework. We will also look at HTTP redirection and handling GET and POST methods.

How to do it...

1. Create a new project, form-handling-in-snap, with the simple stack template:

        stack --resolver lts-9.1 new form-handling-in-snap simple

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

   executable form-handling-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
                       , containers

Once the dependency is added, solve the dependency constraints by using the same resolver and allowing stack to update the stack.yaml...