{"json_modified": "2016-03-28T08:43:32.688145", "uuid": "8f75984d-2c2b-48db-b745-9e951345b5ef", "title": "Headers.has()", "url": "/en-US/docs/Web/API/Headers/has", "tags": ["API", "Reference", "Experimental", "R\u00e9f\u00e9rence", "Fetch", "Exp\u00e9rimental", "has", "Method"], "translations": [], "modified": "2015-03-17T02:27:11", "label": "Headers.has()", "localization_tags": [], "locale": "en-US", "id": 144251, "last_edit": "2015-03-17T02:27:08", "summary": "The <strong><code>has()</code></strong><code> </code>method of the <a href=\"/en-US/docs/Web/API/Headers\" title=\"The Headers interface of the Fetch API&#xA0;allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting, adding to, and removing. A Headers object has an associated header list, which is initially empty and consists&#xA0;of zero or more name and value pairs. &#xA0;You can add to this using methods like append() (see Examples.)&#xA0;In all methods of this interface, header names are matched by case-insensitive byte sequence.\"><code>Headers</code></a> interface returns a boolean stating whether a <code>Headers</code> object contains a certain header.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Parameters", "title": "Parameters"}, {"id": "Returns", "title": "Returns"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/Headers/has", "review_tags": []}