{"json_modified": "2016-10-20T03:14:10.482328", "uuid": "d7120ebc-6c49-48f8-9ebd-e88f1c79d83d", "title": "Preflight request", "url": "/en-US/docs/Glossary/Preflight_request", "tags": ["CORS", "HTTP"], "translations": [], "modified": "2016-10-20T03:14:10", "label": "Preflight request", "localization_tags": [], "locale": "en-US", "id": 196597, "last_edit": "2016-10-20T03:14:06", "summary": "A CORS preflight request is a <a href=\"/en-US/docs/Glossary/CORS\">CORS</a> request that checks to see if the <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/CORS\" title=\"CORS: CORS&#xA0;(Cross-Origin Resource Sharing) is a system, consisting of transmitting HTTP headers, that&#xA0;determines&#xA0;whether to block or fulfill requests for restricted resources on a web page from another domain outside the domain from which the resource originated.\">CORS</a> protocol is understood.", "sections": [{"id": "See_also", "title": "See also"}], "slug": "Glossary/Preflight_request", "review_tags": []}