Documentation

Sends a response to the client. Used by render functions.

This is the normal way to respond - it calls the WAI respond callback directly and returns the ResponseReceived.

Sends a response and exits the current action via early return. Sends the response via respondWith then throws EarlyReturnException so the action short-circuits.

Add headers to current response | Returns a Response with headers

addResponseHeaders [("Content-Type", "text/html")] response

Add headers to current response, getting the headers from the request vault | Returns a Response with headers

addResponseHeadersFromContext response

You probabaly want setHeader

Exit a request handler early after sending a response.

Use this when you want to conditionally exit a handler:

handler = do
    when someCondition do
        earlyReturn (sendErrorResponse ...)
    -- rest of the handler
    sendNormalResponse

The function runs the given IO action (which should send a response), then throws EarlyReturnException to exit. The middleware catches this exception so it doesn't propagate further.

Exception thrown by earlyReturn to exit a handler after the response has been sent.