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How to Make Cross-Domain HTTP Requests in JavaScript Using JSONP?

Mary-Kate Olsen
Release： 2024-10-31 04:46:30
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How to Make Cross-Domain HTTP Requests in JavaScript Using JSONP?

JSONP Requests in JavaScript Using the Native API

Cross-domain HTTP requests often encounter the same-origin policy, which restricts requests originating from a different domain or an unsecured (HTTP) domain to a secure (HTTPS) domain. JSONP (JSON with Padding) is a technique used to circumvent this limitation, allowing JavaScript code to retrieve data from a different domain.

Creating a JSONP Request

To make a JSONP request without external libraries, follow these steps:

  1. Create a Callback Function: Define a JavaScript function that will handle the response data. The name of this function will be used as the callback parameter in the JSONP request.

  2. Construct the Request URL: The JSONP request URL should include the following parameters:

    • The server URL where the data is hosted
    • The callback parameter set to the name of your callback function
    • The data you want to send (optional)
  3. Create a Script Element: Create a
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