output: #fixed code
                               @Test
  	public void testDelete() throws JSONException, UnirestException {
  		HttpResponse<JsonNode> response = Unirest.delete(MockServer.DELETE).asJson();
  		assertEquals(200, response.getStatus());
  
  		response = Unirest.delete(MockServer.DELETE)
  				.field("name", "mark")
  				.field("foo","bar")
  				.asJson();
  
  		RequestCapture parse = parse(response);
  		parse.assertParam("name", "mark");
  		parse.assertParam("foo", "bar");
  	}
input: #vulnerable code 
                               @Test
  	public void testDelete() throws JSONException, UnirestException {
  		HttpResponse<JsonNode> response = Unirest.delete("http://httpbin.org/delete").asJson();
  		assertEquals(200, response.getStatus());
  
  		response = Unirest.delete("http://httpbin.org/delete").field("name", "mark").asJson();
  		assertEquals("mark", response.getBody().getObject().getJSONObject("form").getString("name"));
  	} 
                              #location 7 
                              #vulnerability type NULL_DEREFERENCE