The Cro::HTTP::Response class does the Cro::HTTP::Message role, which provides methods for working with headers and the request body. This class adds functionality specific to HTTP responses.

Status code§

The status property is used to get and set the HTTP response status code. It is constrained to hold a 3-digit integer value in the range 100..599.


Calling the Str method on a Cro::HTTP::Response will serialize the status line and headers, giving the HTTP/1.* wire representation of the message but excluding the body.

Push promises (server side)§

The add-push-promise method adds a Cro::HTTP::PushPromise to the response. Mutiple push promises may be added. Provided the response is handled by the HTTP/2.0 response serializer, push promise frames will be sent to the client, and the Cro::HTTP::PushPromise will be sent to the HTTP/2.0 request parser, which will emit it as if it were an incoming request.

The close-push-promises method indicates that no more push promises may be added beyond this point. It is typically called by the response serializer, and ordinary Cro users will have no need to call it.

The push-promises method returns a Supply that will emit each of the added push promises, and be done provided close-push-promises was called.

Push promises (client side)§

The push-promises method returns a Supply that emits any push promises that are sent by the remote server. Each will be emitted as an instance of Cro::HTTP::PushPromise. One no further push promises may arrive, the Supply will be done. In the event this method is called on a response that is not using HTTP/2.0, then returned Supply will be done immediately.

Internally, the add-push-promise and close-push-promises methods are used by the HTTP/2.0 response parser to set up the responses. Put another way, the client and server side of push promises share an API, with opposite parts of it considered internal and external depending which side one is on.