Haskell Wai Tutorial
Table of Contents
1 What is Wai?
- Wai is a common protocol for communication between web application and web server.
- Wai can be used to create RESTful web services.
2 How to install it?
cabal install wai
3 First Hello World Example.
{-# LANGUAGE OverloadedStrings #-} import Network.Wai import Network.HTTP.Types import Network.Wai.Handler.Warp (run) app :: Application app _ respond = do respond $ responseLBS status200 [("Content-Type", "text/plain")] "Hello, World!" main :: IO () main = do putStrLn $ "http://localhost:8080/" run 8080 app
4 How to response a file from your Wai server.
- responseFile
- Assume file
index.html
is in the current dir where the server is running.
plainIndex::Response plainIndex = responseFile status200 [("Content-Type", "text/html")] "index.html" Nothing app _ respond = do respond responseFile main:: IO() main = do run 8080 app