@echo off
SET "URL=http://arr:1234/"
SET "HC=https://hc-ping.com/df5d848e-9376-45d1-b839-3cd92f242a06"
curl.exe -m 10 --retry 5 "%HC%/start"

SET HTTP=
for /f %%a in ( '"curl.exe" -s -o nul -v -w "%%{http_code}" "%URL%"' ) do set HTTP=%%a

if "%HTTP%" == "200" (
    curl.exe -m 10 --retry 5 "%HC%"
) else (
    curl.exe -m 10 --retry 5 "%HC%/1"
)