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Build a browser-reachable vf viewer URL

GET 
/api/viewer-url

Constructs the vf HTTPS viewer URL on port 8081 using the current request host, selected color mode, and zero-based channel selection. When src is omitted, all channels within the resolved capacity are included; supplied indexes that are invalid or exceed an SDK port-publication limit are discarded. The response also explains whether capacity came from a DevKit, the SDK port map, or the legacy 80-channel fallback.

Request​

Responses​

Viewer URL plus the resolved SDK or DevKit channel capacity.