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Correct Cache-Control Behavior for GS(S)P (vercel#11022)
* Correct Cache-Control Behavior for GS(S)P * remove old line * fix test
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,50 @@ | ||
import { ServerResponse } from 'http' | ||
import { isResSent } from '../lib/utils' | ||
|
||
export function sendPayload( | ||
res: ServerResponse, | ||
payload: any, | ||
type: 'html' | 'json', | ||
options?: | ||
| { private: true } | ||
| { private: boolean; stateful: true } | ||
| { private: boolean; stateful: false; revalidate: number | false } | ||
): void { | ||
if (isResSent(res)) { | ||
return | ||
} | ||
|
||
// TODO: ETag headers? | ||
res.setHeader( | ||
'Content-Type', | ||
type === 'json' ? 'application/json' : 'text/html; charset=utf-8' | ||
) | ||
res.setHeader('Content-Length', Buffer.byteLength(payload)) | ||
if (options != null) { | ||
if (options.private || options.stateful) { | ||
if (options.private || !res.hasHeader('Cache-Control')) { | ||
res.setHeader( | ||
'Cache-Control', | ||
`private, no-cache, no-store, max-age=0, must-revalidate` | ||
) | ||
} | ||
} else if (typeof options.revalidate === 'number') { | ||
if (options.revalidate < 1) { | ||
throw new Error( | ||
`invariant: invalid Cache-Control duration provided: ${options.revalidate} < 1` | ||
) | ||
} | ||
|
||
res.setHeader( | ||
'Cache-Control', | ||
`s-maxage=${options.revalidate}, stale-while-revalidate` | ||
) | ||
} else if (options.revalidate === false) { | ||
res.setHeader( | ||
'Cache-Control', | ||
`s-maxage=31536000, stale-while-revalidate` | ||
) | ||
} | ||
} | ||
res.end(payload) | ||
} |
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