The contents of this section are based on Happstack 6.0 which includes new functionality.
It is trivial to use BlazeHtml with Happstack. Essentially you just use toResponse to convert a blaze Html value into a Response. For more detailed information on using BlazeHtml, see the BlazeHtml website. The following example should get you started:
> {-# LANGUAGE OverloadedStrings #-}
> module Main where
>
> import Happstack.Server
> import Text.Blaze ((!))
> import qualified Text.Blaze.Html4.Strict as H
> import qualified Text.Blaze.Html4.Strict.Attributes as A
>
> appTemplate :: String -> [H.Html] -> H.Html -> H.Html
> appTemplate title headers body =
> H.html $ do
> H.head $ do
> H.title (H.string title)
> H.meta ! A.httpEquiv "Content-Type" ! A.content "text/html;charset=utf-8"
> sequence_ headers
> H.body $ do
> body
>
> helloBlaze :: ServerPart Response
> helloBlaze =
> ok $ toResponse $
> appTemplate "Hello, Blaze!"
> [H.meta ! A.name "keywords" ! A.content "happstack, blaze, html"]
> (H.p "hello, blaze!")
>
> main :: IO ()
> main = simpleHTTP nullConf $ helloBlaze
[Source code for the app is here.]
Now if we visit http://localhost:8000/, we will get an html page which says:
hello, blaze!
This example is pretty simple, but there are a few things to
note:
- The
appTemplate function is purely BlazeHtml code and is in no way Happstack specific.
- The existence of the
appTemplate is purely a stylistic choice.
- I have found it useful to set the content-type meta tag.
- Happstack will automatically set the HTTP header Content-Type: text/html; charset=UTF-8. (BlazeHtml only supports UTF-8)