除非按下F12，否则REST控制器无法工作

Question

当我按下一个触发AJAX事件的按钮时，我想知道为什么我在Eclipse IDE中收到此异常：

  

无法读取HTTP消息：org.springframework.http.converter.HttpMessageNotReadableException：读取输入消息时出现I / O错误;嵌套异常是java.net.SocketTimeoutException

但是，如果我在Chrome中按F12，该程序将起作用。我在将AJAX请求传递给REST控制器时使用Spring Boot。

public ResponseEntity<?> readData(@RequestBody String string){
  System.out.print(string);
  FileProcessor fileProcessor = new FileProcessor();
  fileProcessor.execute(string.split("\n"));
  List<Record> records = fileProcessor.getRecords();
  return new ResponseEntity<List<Record>>(records,HttpStatus.OK);
}

    var ajaxRead = false;
    if (window.XMLHttpRequest) {
        ajaxRead = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        ajaxRead = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if(ajaxRead) {
    ajaxRead.open("POST","/readFile",true);
    ajaxRead.send(verify + "\n" + data);
    ajaxRead.onreadystatechange = function(){
        if(ajaxRead.readyState === 4){
            if(ajaxRead.status === 200){
                 alert("Success!");
            }else
                clearFile(ajaxRead.responseText);
            }
        }
     }
  }