Happstack: Request

Under Construction

Request

A Request represents an HTTP request. This generally means that a user is either asking for data from the server, or trying to give data to the server.

These two methods are generally defined as:

•  GET : Get a file/data from the server.  
  

•  POST : Give data to the server.
  

In the server, we can ask for the request with the method askRq. Here is a simple example that I have put together:

reqExample :: ServerPartT IO Response
reqExample =
   do req <- askRq
      ok $ toResponse $ show req

(We stuff the value of askRq into req, as askRq will return the type m0 Request, which unfortunately we cannot call show on 😭)

This example can be run in Happstack with the following main method:

code :: String
code = "example"

main :: IO ()
main = do
    simpleHTTP nullConf $
      msum [ dir code $ reqExample
           ]

Now, let's run the example. When the server is running, we can now visit the page http://localhost:8000/example/.

What we now see is the request you just made, in its entirety!

Look here to see which methods we can use to dissect a request.

To takeaway: The 'current' Request can always be accessed.