method ServerResponse.prototype.writeEarlyHints
ServerResponse.prototype.writeEarlyHints(hints: Record<string, string | string[]>,callback?: () => void,): voidDeprecated
Sends an HTTP/1.1 103 Early Hints message to the client with a Link header,
indicating that the user agent can preload/preconnect the linked resources.
The hints is an object containing the values of headers to be sent with
early hints message. The optional callback argument will be called when
the response message has been written.
Example
const earlyHintsLink = '</styles.css>; rel=preload; as=style';
response.writeEarlyHints({
'link': earlyHintsLink,
});
const earlyHintsLinks = [
'</styles.css>; rel=preload; as=style',
'</scripts.js>; rel=preload; as=script',
];
response.writeEarlyHints({
'link': earlyHintsLinks,
'x-trace-id': 'id for diagnostics',
});
const earlyHintsCallback = () => console.log('early hints message sent');
response.writeEarlyHints({
'link': earlyHintsLinks,
}, earlyHintsCallback);
void