5bf070a857
The responding side now relies on a new MetadataExtractor which decodes metadata entries of interest, and adds them to an output map whose values are then added as Message headers, and are hence accessible to controller methods. Decoded metadata entry values can be added to the output map one for one, or translated to any number of values (e.g. JSON properties), as long as one of the resulting pairs has a key called "route". On the requesting side, now any metadata can be sent, and a String route for example is not required to be provided explicitly. Instead an application could create any metadata (e.g. JSON properties) as long as the server can work out the route from it. The commit contains further refinements on the requesting side so that any mime type can be used, not only composite or routing metadata, e.g. a route in an "text/plain" entry. Closes gh-23157
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