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feat: add writeEarlyHints utility #184

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merged 2 commits into from
Oct 12, 2022
Merged

feat: add writeEarlyHints utility #184

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afe0ccd
perf: add `writeEarlyHints` utility
danielroe Sep 28, 2022
8c99b8b
docs: add util entry to readme
danielroe Oct 12, 2022
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14 changes: 13 additions & 1 deletion src/event/event.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import type { IncomingMessage as NodeIncomingMessage, ServerResponse as NodeServerResponse } from 'http'
import type { IncomingMessage, ServerResponse, H3EventContext } from '../types'
import type { IncomingMessage, ServerResponse, H3EventContext, CompatibilityEvent } from '../types'
import { MIMES } from '../utils'
import { H3Response } from './response'

Expand Down Expand Up @@ -77,3 +77,15 @@ export function isEvent (input: any): input is H3Event {
export function createEvent (req: NodeIncomingMessage, res: NodeServerResponse): H3Event {
return new H3Event(req, res)
}

export function writeEarlyHints (event: CompatibilityEvent, links: string | string[], callback?: () => void) {
if (!event.res.socket && !('writeEarlyHints' in event.res)) { return }

if ('writeEarlyHints' in event.res) {
// @ts-expect-error native node 18 implementation
return event.res.writeEarlyHints(links, callback)
}

const _links = Array.isArray(links) ? links : [links]
event.res.socket!.write(`HTTP/1.1 103 Early Hints\r\nLink: ${_links.join('\r\n')}\r\n\r\n`, 'utf-8', callback)
}