forked from vercel/next.js
/
index.ts
102 lines (87 loc) · 2.31 KB
/
index.ts
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import type { IncomingMessage, ServerResponse } from 'http'
import { isResSent } from '../../shared/lib/utils'
import { generateETag } from '../lib/etag'
import fresh from 'next/dist/compiled/fresh'
import RenderResult from '../render-result'
import { setRevalidateHeaders } from './revalidate-headers'
export type PayloadOptions =
| { private: true }
| { private: boolean; stateful: true }
| { private: boolean; stateful: false; revalidate: number | false }
export { setRevalidateHeaders }
export function sendEtagResponse(
req: IncomingMessage,
res: ServerResponse,
etag: string | undefined
): boolean {
if (etag) {
/**
* The server generating a 304 response MUST generate any of the
* following header fields that would have been sent in a 200 (OK)
* response to the same request: Cache-Control, Content-Location, Date,
* ETag, Expires, and Vary. https://tools.ietf.org/html/rfc7232#section-4.1
*/
res.setHeader('ETag', etag)
}
if (fresh(req.headers, { etag })) {
res.statusCode = 304
res.end()
return true
}
return false
}
export async function sendRenderResult({
req,
res,
result,
type,
generateEtags,
poweredByHeader,
options,
}: {
req: IncomingMessage
res: ServerResponse
result: RenderResult
type: 'html' | 'json'
generateEtags: boolean
poweredByHeader: boolean
options?: PayloadOptions
}): Promise<void> {
if (isResSent(res)) {
return
}
if (poweredByHeader && type === 'html') {
res.setHeader('X-Powered-By', 'Next.js')
}
const payload = result.isDynamic() ? null : await result.toUnchunkedString()
if (payload) {
const etag = generateEtags ? generateETag(payload) : undefined
if (sendEtagResponse(req, res, etag)) {
return
}
}
const resultContentType = result.contentType()
if (!res.getHeader('Content-Type')) {
res.setHeader(
'Content-Type',
resultContentType
? resultContentType
: type === 'json'
? 'application/json'
: 'text/html; charset=utf-8'
)
}
if (payload) {
res.setHeader('Content-Length', Buffer.byteLength(payload))
}
if (options != null) {
setRevalidateHeaders(res, options)
}
if (req.method === 'HEAD') {
res.end(null)
} else if (payload) {
res.end(payload)
} else {
await result.pipe(res)
}
}