From Wikipedia, the free encyclopedia
| HTTP |
| Persistence · Compression · SSL |
| Headers |
| ETag · Cookie · Referer |
| Status codes |
| 200 OK |
| 302 Found |
| 403 Forbidden |
| 404 Not Found |
XMLHttpRequest (XHR) is an API that can be used by JavaScript and other web browser scripting languages to transfer XML and other text data between a web page’s Client-Side and Server-Side. Though it can do synchronous fetches, it is virtually always asynchronous, due to the greater UI responsiveness[1].
The data returned from XMLHttpRequest calls will often be provided by back-end databases. Besides XML, XMLHttpRequest can be used to fetch data in other formats such as HTML, JSON or plain text.
XMLHttpRequest is an important part of the Ajax web development technique, and it is used by many websites to implement responsive and dynamic web applications. Examples of web applications that make use of XMLHttpRequest include Google Maps, Windows Live’s Virtual Earth, the MapQuest dynamic map interface, Facebook and many others.
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