{"json_modified": "2016-10-14T05:19:31.792177", "uuid": "ceebfd11-90fe-4454-b3d6-8d7f6d2b69fe", "title": "Vary", "url": "/en-US/docs/Web/HTTP/Headers/Vary", "tags": ["Response Header", "Response", "Reference", "header", "HTTP"], "translations": [], "modified": "2016-10-14T05:19:31", "label": "Vary", "localization_tags": [], "locale": "en-US", "id": 192781, "last_edit": "2016-08-31T04:30:42", "summary": "The <strong><code>Vary</code></strong> HTTP response header determines how to match future request headers to decide whether a cached response can be used rather than requesting a fresh one from the origin server. It is used by the server to indicate which headers it used when selecting a representation of a resource in a <a href=\"/en-US/docs/Web/HTTP/Content_negotiation\">content negotiation</a> algorithm.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Directives", "title": "Directives"}, {"id": "Examples", "title": "Examples"}, {"id": "Dynamic_serving", "title": "Dynamic serving"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "Compatibility_notes", "title": "Compatibility notes"}, {"id": "See_also", "title": "See also"}], "slug": "Web/HTTP/Headers/Vary", "review_tags": []}