I have a simple servant application with rest api:
type API = "items" :> Get '[JSON] [MyData]
app :: Application
app = serve api server
api :: Proxy API
api = Proxy
server :: Server API
server = getItems
getItems :: ExceptT ServantErr IO [MyData]
getItems = ......
startApp :: IO ()
startApp = run 1234 app
How can I get access to http headers and return a certain response, say, http403, depending on a condition?
Using Servant's Header
(Servant Docs)
type API = "items"
:> Header "Auth-token" Text
:> Get '[JSON] [MyData]
then
handler :: Maybe Text -> ExceptT ServantErr IO [MyData]
handler (Just "secret-code") = right [mydata]
handler _ = left $ err403 { errBody = "no access" }