The input context that is passed through by actors.
A readable string stream in a certain serialization that needs to be parsed.
OptionalheadersThe returned headers of the final URL.
OptionalmetadataMetadata properties to be given to the string stream that needs to be parsed
OptionalurlThe URL the data was obtained from, which identifies the data in messages such as errors. Data that was not obtained from a URL (such as a serialized source) describes where it comes from instead.
Data interface for the type of action.