I don’t know of anything, but this might be of interest:
@jerrysv made a proof-of-concept HTTP server in a Rack module:
Rack v2 will include a “headless” (no user interface or graphics) mode of operation.
A use case I could imagine: hypothetical automation/server module serves HTTP endpoint. Requests to this endpoint (from a browser, or anything else really) could potentially change parameters of other modules in the patch. I believe this could be more easily accomplished via MIDI mapping.