无法将POST请求发送到服务器

Question

I'm writing a basic thread pooled web server in Java for learning purposes; 我正在用Java编写一个基本的线程池Web服务器，以供学习之用。 using the HttpServer and HttpHandler classes. 使用HttpServer和HttpHandler类。

The server class has its run method like so: 服务器类具有以下运行方法：

@Override
    public void run() {
        try {
            executor = Executors.newFixedThreadPool(10);
            httpServer = HttpServer.create(new InetSocketAddress(port), 0); 
            httpServer.createContext("/start", new StartHandler());
            httpServer.createContext("/stop", new StopHandler());
            httpServer.setExecutor(executor);
            httpServer.start();
        } catch (Throwable t) {
        }
    }

The StartHandler class, which implements HttpHandler, serves up an html page when typing http://localhost:8080/start in a web browser. 实现HttpHandler的StartHandler类在Web浏览器中键入http：// localhost：8080 / start时会提供一个html页面。 The html page is: html页面是：

<!DOCTYPE html>
<html>
<head>
    <meta charset="ISO-8859-1">
    <title>Thread Pooled Server Start</title>
    <script type="text/javascript">
        function btnClicked() {
            var http = new XMLHttpRequest();
            var url = "http://localhost:8080//stop";
            var params = "abc=def&ghi=jkl";
            http.open("POST", url, true);

            //Send the proper header information along with the request
            http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            http.setRequestHeader("Content-length", params.length);
            http.setRequestHeader("Connection", "close");

            http.onreadystatechange = function() {//Call a function when the state changes.
                if(http.readyState == 4 && http.status == 200) {
                    alert(http.responseText);
                }
            }
            http.send(params);
        }
    </script>
</head>
<body>
    <button type="button" onclick="btnClicked()">Stop Server</button>
</body>
</html>

Basically, above html file contains a single button, which when clicked is supposed to send a POST request to the server on the URL http://localhost:8080/stop (the context for StopHandler above). 基本上，上面的html文件包含一个按钮，单击该按钮应该会向URL http：// localhost：8080 / stop （上述StopHandler的上下文）上的服务器发送POST请求。

The StopHandler class also implements HttpHandler, but I don't see the StopHandler's handle() function being called at all on the button click (I've a System.out.println in it which isn't executed). StopHandler类也实现了HttpHandler，但是单击按钮时根本看不到StopHandler的handle（）函数（我有一个System.out.println，它没有执行）。 From what I understand, since the above html page's button click sends a POST request to the context http://localhost:8080/stop which is set to StopHandler, shouldn't it's handle() function be executed? 据我了解，由于上述html页面的按钮单击将POST请求发送到设置为StopHandler的上下文http：// localhost：8080 / stop ，因此是否应该执行handle（）函数？ When I tried executing http://localhost:8080/stop via a web browser, the StopHandler's handle() function is called. 当我尝试通过Web浏览器执行http：// localhost：8080 / stop时，将调用StopHandler的handle（）函数。

Thanks for your time. 谢谢你的时间。

Answer 1

It's more of a workaround, but I was able to send POST request correctly by using a form and bypassing XmlHttpRequest. 这更多是一种解决方法，但是我可以通过使用表单并绕过XmlHttpRequest来正确发送POST请求。 Although I still believe XmlHttpRequest should work. 尽管我仍然相信XmlHttpRequest应该可以工作。

<form action="http://localhost:8080/stop" method="post">
        <input type="submit" value="Stop Server">
</form>

无法将POST请求发送到服务器

问题描述

1 个解决方案

解决方案1
0 已采纳 2016-03-17 07:09:24

无法将POST请求发送到服务器

问题描述

1 个解决方案

解决方案1 0 已采纳 2016-03-17 07:09:24

解决方案1
0 已采纳 2016-03-17 07:09:24