next/dist/esm/server/send-payload.js

The React Framework

import { isResSent } from '../shared/lib/utils';
import { generateETag } from './lib/etag';
import fresh from 'next/dist/compiled/fresh';
import { getCacheControlHeader } from './lib/cache-control';
import { HTML_CONTENT_TYPE_HEADER } from '../lib/constants';
export function sendEtagResponse(req, res, etag) {
    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, generateEtags, poweredByHeader, cacheControl }) {
    if (isResSent(res)) {
        return;
    }
    if (poweredByHeader && result.contentType === HTML_CONTENT_TYPE_HEADER) {
        res.setHeader('X-Powered-By', 'Next.js');
    }
    // If cache control is already set on the response we don't
    // override it to allow users to customize it via next.config
    if (cacheControl && !res.getHeader('Cache-Control')) {
        res.setHeader('Cache-Control', getCacheControlHeader(cacheControl));
    }
    const payload = result.isDynamic ? null : result.toUnchunkedString();
    if (generateEtags && payload !== null) {
        const etag = generateETag(payload);
        if (sendEtagResponse(req, res, etag)) {
            return;
        }
    }
    if (!res.getHeader('Content-Type') && result.contentType) {
        res.setHeader('Content-Type', result.contentType);
    }
    if (payload) {
        res.setHeader('Content-Length', Buffer.byteLength(payload));
    }
    if (req.method === 'HEAD') {
        res.end(null);
        return;
    }
    if (payload !== null) {
        res.end(payload);
        return;
    }
    // Pipe the render result to the response after we get a writer for it.
    await result.pipeToNodeResponse(res);
}

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