{
  "http": {
    "headers": {
      "Accept-Encoding": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Accept-Encoding",
          "spec_url": "https://httpwg.org/specs/rfc9110.html#field.accept-encoding",
          "tags": [
            "web-features:http11"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "≤11"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "br": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Accept-Encoding#br",
            "spec_url": "https://www.rfc-editor.org/info/rfc7932/#section-13",
            "tags": [
              "web-features:brotli"
            ],
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "51"
              },
              "edge": {
                "version_added": "15"
              },
              "firefox": {
                "version_added": "44"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": {
                "version_added": "36"
              },
              "opera_android": "mirror",
              "safari": {
                "version_added": "11",
                "notes": "Unsupported before macOS 10.13 High Sierra."
              },
              "safari_ios": {
                "version_added": "11"
              },
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "dcb": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Accept-Encoding#dcb",
            "spec_url": "https://httpwg.org/specs/rfc9842.html#dictionary-compressed-brotli",
            "tags": [
              "web-features:compression-dictionary-transport"
            ],
            "support": {
              "chrome": {
                "version_added": "130"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "preview",
                  "impl_url": "https://bugzil.la/1882979"
                },
                {
                  "version_added": "145",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "network.http.dictionaries.enable",
                      "value_to_set": "true"
                    }
                  ],
                  "impl_url": "https://bugzil.la/1917963"
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": true,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "dcz": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Content-Encoding#dcz",
            "spec_url": "https://httpwg.org/specs/rfc9842.html#dictionary-compressed-zstandard",
            "tags": [
              "web-features:compression-dictionary-transport"
            ],
            "support": {
              "chrome": {
                "version_added": "130"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "preview",
                  "impl_url": "https://bugzil.la/1882979"
                },
                {
                  "version_added": "145",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "network.http.dictionaries.enable",
                      "value_to_set": "true"
                    }
                  ],
                  "impl_url": "https://bugzil.la/1917963"
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": true,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "zstd": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Accept-Encoding#zstd",
            "spec_url": [
              "https://www.rfc-editor.org/info/rfc8878/#name-content-encoding",
              "https://www.rfc-editor.org/info/rfc9659/#name-content-encoding"
            ],
            "tags": [
              "web-features:zstd"
            ],
            "support": {
              "chrome": {
                "version_added": "123"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "126"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": "26.3",
                "notes": "Before macOS 26.3 Tahoe, this header value is not sent."
              },
              "safari_ios": {
                "version_added": "26.3"
              },
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}