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Description of Change
HTTP 204 is a successful return code which indicates No Content. While it's appropriate to return a 304 if the server has content for a device but it hasn't change, it is more accurate for a server to return a 204 if it simply doesn't have any firmware files for a particular device.
Tests scenarios
Change is hardware independent and relies on the HTTP return code. Will work on all supported hardware. Tested on Arduino-esp32 core v3.2.0 with ESP32 Devkit C board.