{
  "@context": "https://schema.org",
  "@id": "https://webspecification.com/spec/performance/conditional-requests.jsonld",
  "@graph": [
    {
      "@type": "TechArticle",
      "@id": "https://webspecification.com/spec/performance/conditional-requests/#article",
      "headline": "Conditional requests (ETag, Last-Modified, 304)",
      "description": "Send a validator — ETag or Last-Modified — on every cacheable response, and honour If-None-Match / If-Modified-Since so unchanged resources return an empty 304 instead of the full body.",
      "url": "https://webspecification.com/spec/performance/conditional-requests/",
      "inLanguage": "en",
      "isPartOf": {
        "@type": "WebSite",
        "@id": "https://webspecification.com/#website",
        "name": "Web Specification Studio",
        "url": "https://webspecification.com"
      },
      "author": {
        "@type": "Person",
        "name": "Web Specification Studio",
        "url": "https://webspecification.com"
      },
      "publisher": {
        "@type": "Organization",
        "@id": "https://webspecification.com/#organization",
        "name": "Web Specification Studio",
        "url": "https://webspecification.com"
      },
      "license": "https://creativecommons.org/licenses/by/4.0/",
      "dateModified": "2026-06-09T11:00:00.000Z",
      "citation": [
        {
          "@type": "CreativeWork",
          "name": "RFC 9110 §13 — Conditional Requests",
          "url": "https://www.rfc-editor.org/rfc/rfc9110#section-13",
          "publisher": {
            "@type": "Organization",
            "name": "IETF"
          }
        },
        {
          "@type": "CreativeWork",
          "name": "RFC 9110 §8.8 — Validator Fields (ETag, Last-Modified)",
          "url": "https://www.rfc-editor.org/rfc/rfc9110#section-8.8",
          "publisher": {
            "@type": "Organization",
            "name": "IETF"
          }
        },
        {
          "@type": "CreativeWork",
          "name": "MDN — HTTP conditional requests",
          "url": "https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests",
          "publisher": {
            "@type": "Organization",
            "name": "MDN"
          }
        },
        {
          "@type": "CreativeWork",
          "name": "MDN — 304 Not Modified",
          "url": "https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304",
          "publisher": {
            "@type": "Organization",
            "name": "MDN"
          }
        }
      ]
    },
    {
      "@type": "BreadcrumbList",
      "@id": "https://webspecification.com/spec/performance/conditional-requests/#breadcrumb",
      "itemListElement": [
        {
          "@type": "ListItem",
          "position": 1,
          "name": "Home",
          "item": "https://webspecification.com/"
        },
        {
          "@type": "ListItem",
          "position": 2,
          "name": "Spec",
          "item": "https://webspecification.com/spec/"
        },
        {
          "@type": "ListItem",
          "position": 3,
          "name": "Performance",
          "item": "https://webspecification.com/spec/performance/"
        },
        {
          "@type": "ListItem",
          "position": 4,
          "name": "Conditional requests (ETag, Last-Modified, 304)",
          "item": "https://webspecification.com/spec/performance/conditional-requests/"
        }
      ]
    }
  ]
}