package uk.ac.ic.wlgitbridge.server;

import org.eclipse.jetty.server.HttpConnection;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import uk.ac.ic.wlgitbridge.bridge.Bridge;
import uk.ac.ic.wlgitbridge.util.Log;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HealthCheckHandler extends AbstractHandler {

  private final Bridge bridge;

  public HealthCheckHandler(Bridge bridge) {
    this.bridge = bridge;
  }

  @Override
  public void handle(
    String target,
    Request baseRequest,
    HttpServletRequest request,
    HttpServletResponse response
  ) throws IOException {
    String method = baseRequest.getMethod();
    if (
      ("GET".equals(method) || "HEAD".equals(method))
        && target != null
        && target.matches("^\\/health_check\\/?$")
    ) {
      Log.info(method + " <- /health_check");
      baseRequest.setHandled(true);
      response.setContentType("text/plain");
      if (bridge.healthCheck()) {
        response.setStatus(200);
        response.getWriter().println("ok");
      } else {
        response.setStatus(500);
        response.getWriter().println("failed");
      }
    }
  }

}

package uk.ac.ic.wlgitbridge.server;

import org.eclipse.jetty.server.HttpConnection;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import uk.ac.ic.wlgitbridge.bridge.Bridge;
import uk.ac.ic.wlgitbridge.util.Log;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HealthCheckHandler extends AbstractHandler {

  private final Bridge bridge;

  public HealthCheckHandler(Bridge bridge) {
    this.bridge = bridge;
  }

  @Override
  public void handle(
    String target,
    Request baseRequest,
    HttpServletRequest request,
    HttpServletResponse response
  ) throws IOException {
    String method = baseRequest.getMethod();
    if (
      ("GET".equals(method) || "HEAD".equals(method))
        && target != null
        && target.matches("^/health_check/?$")
    ) {
      Log.info(method + " <- /health_check");
      baseRequest.setHandled(true);
      response.setContentType("text/plain");
      if (bridge.healthCheck()) {
        response.setStatus(200);
        response.getWriter().println("ok");
      } else {
        response.setStatus(500);
        response.getWriter().println("failed");
      }
    }
  }

}

Update src/main/java/uk/ac/ic/wlgitbridge/server/HealthCheckHandler.java