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XHR ↔ XML HTTP Request

Source: XHR (XMLHttpRequest) - MDN Web Docs Glossary: Definitions of Web-related terms | MDN

aka XML-HTTP-Request

XHR flow

provides method to send network requests between browser-server

XHR and all async tasks handled by callbacks are susceptible to Callback Hell

References​

  1. AJAX ↔ (process) to Asynchronous Data Fetch from Server (via clunky legacy XHR methods)