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Web API to transfer data between a web browser and a web server / From Wikipedia, the free encyclopedia

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XMLHttpRequest (XHR) is a JavaScript class[lower-alpha 1] containing methods to asynchronously transmit HTTP requests from a web browser to a web server.[1] The methods allow a browser-based application to make a fine-grained server call and store the results in XMLHttpRequest's responseText attribute.[2] The XMLHttpRequest class is a component of Ajax programming. Prior to Ajax, an HTML form needed to be completely sent to the server followed by a complete browser page refresh.[2]