Flashing new FALSH from ESP to ATtiny via URL

I want my ESP8266 to flash a new ATtiny84 firmware.
Is it possible for the ESP to check a URL address for a FALSH.hex file, and if it exists, update the ATtiny84?
Have you done anything like this before?

I found a library called Adafruit_AVRProg.h, but I don't know enough to call it in the main program in such a way that it would program my ATTiny84. Have you come across this library?

No i havn't

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https://github.com/adafruit/Adafruit_AVRProg

Here's the link. If anyone has an idea how to do it.

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