usage: log4jcheck.py [-h] -f FILE -u URL [-w WAIT] [-t TIMEOUT] [-p PREFIX] [-q THREADS] [-d DONE]

optional arguments:
  -h, --help            show this help message and exit
  -f FILE, --file FILE  The CSV filename containing the URLs
  -u URL, --url URL     DNS subdomain URL on which th callback is performed
  -w WAIT, --wait WAIT  Number of seconds to wait before next request (default: 1)
  -t TIMEOUT, --timeout TIMEOUT
                        HTTP timeout in seconds to use (default: 5)
  -p PREFIX, --prefix PREFIX
                        Type of prefix, see prefixes_injects for options. (default: 0, options 0-3)
  -q THREADS, --threads THREADS
                        Number of threads to distribute the work
  -d DONE, --done DONE  File where we can keep track of items that are done

python3 .\log4jcheck.py --file .\urls-example.csv --threads 2 --url "L4J.ujz5sgvgo7xuvn03ft9qrws5w.canarytokens.com/a" -w 0 -t 1

package fr.christophetd.log4shell.vulnerableapp;


import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@RestController
public class MainController {

    private static final Logger logger = LogManager.getLogger("HelloWorld");

    @GetMapping("/")
    public String index(@RequestHeader("X-Api-Version") String apiVersion) {
        logger.info("Received a request for API version " + apiVersion);
        return "Hello, world!";
    }

    @GetMapping("/test")
    public String testGet(@RequestParam String test) {
        logger.info("Received a request for test " + test);
        return "Test world!";
    }

    @PostMapping("/test")
    public String test(@RequestBody String test) {
        logger.info("Received a request for test " + test);
        return "Test world!";
    }

}

gradle bootJar --no-daemon
java -jar .\build\libs\log4shell-vulnerable-app-0.0.1-SNAPSHOT.jar

description,URL,method,parameters
test,http://localhost:8080/test,POST,"test"
test,http://localhost:8080/test,GET,"test"