103 Early Hints is "experimental technology" (according to MDN) and isn't supported by Safari and Firefox. In Chrome it's only supported when using HTTP/2 or la

103 Early Hints is "experimental technology" (according to MDN) and isn't supported by Safari and Firefox. In Chrome it's only supported when using HTTP/2 or later (Firefox Nightly support it for HTTP/1). ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103 https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103