The 'J' in Ajax refers to which language?
AnswerJavaScript
JavaScript in the browser sends and handles the requests.
Coding · Facts & stats
Ajax facts & stats
7 fact-checked facts about ajax and asynchronous web programming, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does the 'X' in Ajax stand for?
AnswerXML
XML was the original data format, though JSON is now more common.
Going deeper
Which browser object was the original workhorse for Ajax requests?
AnswerXMLHttpRequest
XMLHttpRequest lets scripts make HTTP requests in the background.
Which data format is most common in Ajax responses today?
AnswerJSON
JSON is lightweight and maps directly to JavaScript objects.
Which HTTP method is normally used simply to retrieve data?
AnswerGET
GET requests fetch a resource without changing it.
Expert level
Which company first shipped the technology behind XMLHttpRequest, in Internet Explorer 5?
AnswerMicrosoft
Microsoft introduced it as an ActiveX object around 1999.
Which mechanism lets a server permit cross-origin Ajax requests?
AnswerCORS
Cross-Origin Resource Sharing uses HTTP headers to allow other origins.
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