{"json_modified": "2016-10-14T05:18:36.449818", "uuid": "5592dd05-d02b-4795-a33d-9b9dfee68b4e", "title": "If-Match", "url": "/en-US/docs/Web/HTTP/Headers/If-Match", "tags": ["HTTP Headers", "Reference", "Conditional Requests", "HTTP", "Request Headers"], "translations": [], "modified": "2016-10-14T05:18:36", "label": "If-Match", "localization_tags": [], "locale": "en-US", "id": 192721, "last_edit": "2016-08-31T04:26:20", "summary": "The <strong><code>If-Match</code></strong> HTTP request header makes the request conditional. For <a href=\"/en-US/docs/Web/HTTP/Methods/GET\" title=\"The GET method requests a representation of the specified resource. Requests using GET should only retrieve data.\"><code>GET</code></a> and <a href=\"/en-US/docs/Web/HTTP/Methods/HEAD\" title=\"The HTTP HEAD method requests the headers that are returned if the specified resource would be requested with an HTTP GET method. Such a request can be done before deciding to download a large resource to save bandwidth, for example.\"><code>HEAD</code></a> methods, the server will send back the requested resource only if it matches one of the listed <code>ETags</code>. For <a href=\"/en-US/docs/Web/HTTP/Methods/PUT\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>PUT</code></a> and other non-safe methods, it will only upload the resource in this case.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Directives", "title": "Directives"}, {"id": "Examples", "title": "Examples"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/HTTP/Headers/If-Match", "review_tags": []}