<!doctype html> <html> <head> <title>XMLHttpRequest: send() - conditional requests</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(text(),'Modified')]/.." /> </head> <body> <div id="log"></div> <script> function request(type) { test(function() { var client = new XMLHttpRequest, identifier = type == "tag" ? Math.random() : new Date().toGMTString(), url = "resources/conditional.py?" + type + "=" + identifier client.open("GET", url, false) client.send(null) assert_equals(client.status, 200) assert_equals(client.statusText, "OK") assert_equals(client.responseText, "MAYBE NOT") client.open("GET", url, false) client.setRequestHeader(type == "tag" ? "If-None-Match" : "If-Modified-Since", identifier) client.send(null) assert_equals(client.status, 304) assert_equals(client.statusText, "SUPERCOOL") assert_equals(client.responseText, "") }, document.title + " (" + type + ")") } request("tag") request("date") </script> </body> </html>