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

The React Framework

import { isNodeNextResponse } from './base-http/helpers';
import { pipeToNodeResponse } from './pipe-readable';
import { splitCookiesString } from './web/utils';
/**
 * Sends the response on the underlying next response object.
 *
 * @param req the underlying request object
 * @param res the underlying response object
 * @param response the response to send
 */ export async function sendResponse(req, res, response, waitUntil) {
    if (// The type check here ensures that `req` is correctly typed, and the
    // environment variable check provides dead code elimination.
    process.env.NEXT_RUNTIME !== 'edge' && isNodeNextResponse(res)) {
        var // Copy over the response headers.
        _response_headers;
        // Copy over the response status.
        res.statusCode = response.status;
        res.statusMessage = response.statusText;
        // TODO: this is not spec-compliant behavior and we should not restrict
        // headers that are allowed to appear many times.
        //
        // See:
        // https://github.com/vercel/next.js/pull/70127
        const headersWithMultipleValuesAllowed = [
            // can add more headers to this list if needed
            'set-cookie',
            'www-authenticate',
            'proxy-authenticate',
            'vary'
        ];
        (_response_headers = response.headers) == null ? void 0 : _response_headers.forEach((value, name)=>{
            // `x-middleware-set-cookie` is an internal header not needed for the response
            if (name.toLowerCase() === 'x-middleware-set-cookie') {
                return;
            }
            // The append handling is special cased for `set-cookie`.
            if (name.toLowerCase() === 'set-cookie') {
                // TODO: (wyattjoh) replace with native response iteration when we can upgrade undici
                for (const cookie of splitCookiesString(value)){
                    res.appendHeader(name, cookie);
                }
            } else {
                // only append the header if it is either not present in the outbound response
                // or if the header supports multiple values
                const isHeaderPresent = typeof res.getHeader(name) !== 'undefined';
                if (headersWithMultipleValuesAllowed.includes(name.toLowerCase()) || !isHeaderPresent) {
                    res.appendHeader(name, value);
                }
            }
        });
        /**
     * The response can't be directly piped to the underlying response. The
     * following is duplicated from the edge runtime handler.
     *
     * See packages/next/server/next-server.ts
     */ const { originalResponse } = res;
        // A response body must not be sent for HEAD requests. See https://httpwg.org/specs/rfc9110.html#HEAD
        if (response.body && req.method !== 'HEAD') {
            await pipeToNodeResponse(response.body, originalResponse, waitUntil);
        } else {
            originalResponse.end();
        }
    }
}

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