XMLHttpRequest

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]

HTTP
Persistence Compression HTTPS QUIC
Request methods
OPTIONS GET HEAD POST PUT DELETE TRACE CONNECT PATCH
Header fields
Cookie ETag Location HTTP referer DNT X-Forwarded-For
Response status codes
301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable for Legal Reasons
Security access control methods
Basic access authentication Digest access authentication
Security vulnerabilities
HTTP header injection HTTP request smuggling HTTP response splitting HTTP parameter pollution
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