无法将数据从POST写入响应

Why cant send given POST data as response? When write response.write('Data is: ', data.toString()); i expect see data from post in browser, but its not work, why? if i use response.write('Some string'); not in callback request.on('data',...) i see written data in browser. If i use console.log(data) in callback request.on('data',...) i see data in console. But response not given any data in that callback. Why?

为什么不能发送给定的POST数据作为响应?写response.write('Data is:',data.toString());我希望在浏览器中看到来自帖子的数据,但它不起作用,为什么?如果我使用response.write('Some string');不在回调request.on('data',...)我在浏览器中看到书面数据。如果我在回调request.on('data',...)中使用console.log(data),我会在控制台中看到数据。但是响应没有给出回调中的任何数据。为什么?

var server = require('http').createServer().listen(8080);
var template = '<form action="" method="post"><input placeholder="login" type="text" name="login" /><br><input type="password" placeholder="password" name="password" /><br><input type="submit" /></form>';

server.on('request', function(request, response){
    response.writeHead(200,{
        'Content-Type': 'text/html;charset=utf-8'
    });

    request.on('data', function(data){
        //console.log(data.toString());//it`s work, i see data in console
        response.write('Data is: '+ data.toString()); //but that code is not working. that data not append to response
    });

    response.write(template);
    response.end();
});

3 个解决方案

#1

Fix for your problem

var server = require('http').createServer().listen(8080);
var template = '<form action="" method="post"><input placeholder="login" type="text" name="login" /><br><input type="password" placeholder="password" name="password" /><br><input type="submit" /></form>';

server.on('request', function(request, response){
    var postData = '';

    response.writeHead(200,{
        'Content-Type': 'text/html;charset=utf-8'
    });

    request.on('data', function(data){
        postData += data.toString(); // store everything sent with the POST request
    });

    request.on('close', function(){
        response.write(template); // print out the template
        if(postData != '')
            response.write('Data is: ', postData); // if POST data was sent output the data
        response.end(); // close the connection
    });
});`

Explanation

Your problem is that node.js/javascript is an event-driven language based on callbacks. When a new request comes in everything in your request-event-function will be executed. This means that the following will be executed:

你的问题是node.js / javascript是一种基于回调的事件驱动语言。当请求中的所有内容都出现时,将执行事件 - 函数。这意味着将执行以下操作:

• response.writeHead which simply predefines the status etc.

response.writeHead只是预定义状态等。

• definition of a callback for the data-event of request. This means that whenever some POST data gets into the connection the callback will be executed.

定义请求的数据事件的回调。这意味着只要某些POST数据进入连接,就会执行回调。

• But then: You write your template to the client and then you close the connection. By that every further callback of the data-event of request will write your POST data to a closed connection.

但是:您将模板写入客户端,然后关闭连接。通过这种方式,请求的数据事件的每次进一步回调都会将您的POST数据写入已关闭的连接。

As the result nothing will be displayed at your website.

因此,您的网站上不会显示任何内容。

#2

var server = require('http').createServer().listen(8080);
var template = '<form action="" method="post"><input placeholder="login" type="text" name="login" /><br><input type="password" placeholder="password" name="password" /><br><input type="submit" /></form>';

server.on('request', function(request, response){
    response.writeHead(200,{
        'Content-Type': 'text/html;charset=utf-8'
    });

    request.on('data', function(data){
        response.write('OK');//thats not as response part
        console.log(123);//see that in console
    });

    response.write(template);
    response.end();
});

#3

Thansk for all. I solved my problem. That code works for me

Thansk为所有人。我解决了我的问题。该代码适用于我

var server = require('http').createServer().listen(8080);
var template = '<form action="" method="post"><input placeholder="login" type="text" name="login" /><br><input type="password" placeholder="password" name="password" /><br><input type="submit" /></form>';

server.on('request', function(request, response){
    response.writeHead(200,{
        'Content-Type': 'text/html;charset=utf-8'
    });

    request.on('data', function(data){
        response.write(data.toString());
    });

    response.write(template);
    request.on('end', function(){
        response.end();
    });
});