Dear Abdoulaye Kama,

use in the IoT of HTTP instead of CoAP is not a standard solution. In special cases, this is also possible. For more information see:

• "CoAP – Constrained Application Protocol" and Figures7932, 7933 and 7934

https://www.researchgate.net/publication/312174308_CoAP_-_Constrained_Application_Protocol

• IoT: CoAP Messages - Structure and Types

https://www.researchgate.net/publication/313926805_IoT_CoAP_Messages_-_Structure_and_Types

• IoT: HTTP-to-CoAP Mapping

https://www.researchgate.net/publication/313927079_IoT_HTTP-to-CoAP_Mapping

Best regards

Anatol Badach

I think HTTP used just in the client side, CoAP protocol used in the constraint IoT resources. there is some proxy to link between them as you said.

https://www.cse.wustl.edu/~jain/cse574-14/ftp/coap/