```html
How to Make an AJAX POST Request with XHR
Introduction
AJAX stands for Asynchronous JavaScript and XML. It is a technique used to send and receive data from a server asynchronously, meaning that it does not interfere with the current page execution. This makes AJAX ideal for applications that require real-time updates or data retrieval without reloading the entire page.
Using XHR for AJAX POST Requests
To make an AJAX POST request using XMLHttpRequest (XHR), follow these steps:
1. Create an XHR object:
``` let xhr = new XMLHttpRequest(); ```
2. Set up the request:
``` xhr.open("POST", url, true); xhr.setRequestHeader("Content-Type", "application/json"); ```
3. Prepare the data:
``` let data = JSON.stringify({ name: "John Doe", age: 30 }); ```
4. Set the processData option to false and send the data:
``` xhr.processData = false; xhr.send(data); ```
5. Handle the response:
``` xhr.onload = function() { if (xhr.status === 200) { let response = JSON.parse(xhr.responseText); // Process the response } else { // Handle the error } }; ```
Additional Notes
* To transport data in JSON format, use `JSON.stringify()` to convert the data to a JSON string. * To transport data in XML format, use `new XMLSerializer().serializeToString()` to convert the XML document to a string. * Remember to handle the response appropriately based on the server's response status code. ```
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