Network.Wai.Middleware.Select

Dynamically choose between Middlewares

It's useful when you want some Middlewares applied selectively.

Example: do not log health check calls:

import Network.Wai
import Network.Wai.Middleware.HealthCheckEndpoint
import Network.Wai.Middleware.RequestLogger

app' :: Application
app' =
  selectMiddleware (selectMiddlewareExceptRawPathInfo "/_healthz" logStdout)
    $ healthCheck app

Since: 3.1.10

Middleware selection

newtype MiddlewareSelection

Relevant Middleware for a given Request.

Constructors

MiddlewareSelection

Fields

• applySelectedMiddleware :: Request -> Maybe Middleware

Instances

Monoid MiddlewareSelection

Defined in Network.Wai.Middleware.Select

Methods

mempty :: MiddlewareSelection

mappend :: MiddlewareSelection -> MiddlewareSelection -> MiddlewareSelection

mconcat :: [MiddlewareSelection] -> MiddlewareSelection

Semigroup MiddlewareSelection

Defined in Network.Wai.Middleware.Select

Methods

(<>) :: MiddlewareSelection -> MiddlewareSelection -> MiddlewareSelection

sconcat :: NonEmpty MiddlewareSelection -> MiddlewareSelection

stimes :: Integral b => b -> MiddlewareSelection -> MiddlewareSelection

selectMiddleware :: MiddlewareSelection -> Middleware

Create the Middleware dynamically applying MiddlewareSelection.

Helpers

selectMiddlewareOn :: (Request -> Bool) -> Middleware -> MiddlewareSelection

Use the Middleware when the predicate holds.

selectMiddlewareOnRawPathInfo :: ByteString -> Middleware -> MiddlewareSelection

Use the Middleware for the given rawPathInfo.

selectMiddlewareExceptRawPathInfo :: ByteString -> Middleware -> MiddlewareSelection

Use the Middleware for all rawPathInfo except then given one.

passthroughMiddleware :: Middleware