Safe Haskell	Safe
Language	Haskell2010

Servant.API.Header

Synopsis

Documentation

data Header sym a Source #

Extract the given header's value as a value of type a.

Example:

>>> newtype Referer = Referer Text deriving (Eq, Show)
>>> 
>>> -- GET /view-my-referer
>>> type MyApi = "view-my-referer" :> Header "from" Referer :> Get '[JSON] Referer

Constructors

Header a
MissingHeader
UndecodableHeader ByteString

(KnownSymbol h, ToByteString v) => AddHeader Symbol h v (Headers ((:) * fst rest) a) (Headers ((:) * (Header h v) ((:) * fst rest)) a) Source #
Methods addHeader :: Headers ((* ': fst) rest) a -> Headers ((* ': Header h v) ((* ': fst) rest)) a -> new Source #
Functor (Header sym) Source #
Methods fmap :: (a -> b) -> Header sym a -> Header sym b # (<$) :: a -> Header sym b -> Header sym a #
(KnownSymbol h, ToByteString x, GetHeaders (HList xs)) => GetHeaders (HList ((:) * (Header h x) xs)) Source #
Methods getHeaders :: HList ((* ': Header h x) xs) -> [Header] Source #
HasLink k sub => HasLink * ((:>) * k (Header sym a) sub) Source #
Associated Types type MkLink ((:>) * k (Header sym a) sub) (endpoint :: (:>) * k (Header sym a) sub) :: * Source # Methods toLink :: Proxy ((* :> k) (Header sym a) sub) endpoint -> Link -> MkLink ((* :> k) (Header sym a) sub) endpoint Source #
Eq a => Eq (Header sym a) Source #
Methods (==) :: Header sym a -> Header sym a -> Bool # (/=) :: Header sym a -> Header sym a -> Bool #
Show a => Show (Header sym a) Source #
Methods showsPrec :: Int -> Header sym a -> ShowS # show :: Header sym a -> String # showList :: [Header sym a] -> ShowS #
(KnownSymbol h, GetHeaders (HList rest), ToByteString v) => GetHeaders (Headers ((:) * (Header h v) rest) a) Source #
Methods getHeaders :: Headers ((* ': Header h v) rest) a -> [Header] Source #
(FromByteString v, BuildHeadersTo xs, KnownSymbol h) => BuildHeadersTo ((:) * (Header h v) xs) Source #
Methods buildHeadersTo :: [Header] -> HList ((* ': Header h v) xs) Source #
type MkLink * ((:>) * k (Header sym a) sub) Source #
type MkLink * ((:>) * k (Header sym a) sub) = MkLink k sub