How Do I Hit an Application Without Hitting the Web Server?


Angela Bailey

How Do I Hit an Application Without Hitting the Web Server?

When it comes to developing web applications, it’s essential to understand how the client interacts with the server. Traditionally, when a user interacts with a web application, their request is sent to the web server, which processes the request and returns a response.

However, there are cases where you may want to bypass the web server and directly interact with the application without impacting the server. In this article, we will explore some techniques that allow you to achieve this.

1. Using AJAX

AJAX (Asynchronous JavaScript and XML) is a powerful technique that allows you to send HTTP requests from a web page without reloading the entire page. With AJAX, you can hit an application endpoint directly without going through the web server.


  function hitApplication() {
    var xhr = new XMLHttpRequest();'GET', '/application-endpoint', true);
    xhr.onreadystatechange = function() {
      if (xhr.readyState === 4 && xhr.status === 200) {

2. Utilizing WebSockets

WebSockets provide full-duplex communication between a client and a server over a single long-lived connection. This means you can establish a direct connection with your application and exchange data without involving the web server in every interaction.


  var socket = new WebSocket('ws://your-application-endpoint');
  socket.onopen = function() {
    console.log('Connected to the application');
  socket.onmessage = function(event) {
    console.log('Received message:',;
  socket.onclose = function() {
    console.log('Connection closed');

3. Using Localhost Testing

During the development phase, you can run your application on a local server, such as Apache or Nginx, and directly hit it without exposing it to the internet. This allows you to test and interact with your application without involving external servers or impacting the production environment.

4. Mocking the Server Responses

If you want to test your application’s behavior without actually hitting the server, you can create mock responses or use tools like JSONPlaceholder or Postman’s mock server feature. These tools allow you to define custom responses that mimic real server behavior, enabling you to test your application’s frontend logic.

  • Create a mock response with JSONPlaceholder:
  "id": 1,
  "title": "Mock Response",
  "body": "This is a mock response from JSONPlaceholder"


In conclusion, there are various techniques available for hitting an application without hitting the web server directly. AJAX and WebSockets allow for direct communication between the client and the application, while localhost testing provides a local environment for development purposes.

Additionally, mocking server responses enables frontend testing without relying on actual server interactions. By utilizing these techniques appropriately, developers can optimize their workflow and streamline their web application development process.

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