next/dist/esm/server/lib/server-ipc/utils.js

The React Framework

export const ipcForbiddenHeaders = [
    'accept-encoding',
    'keepalive',
    'keep-alive',
    'content-encoding',
    'transfer-encoding',
    // https://github.com/nodejs/undici/issues/1470
    'connection',
    // marked as unsupported by undici: https://github.com/nodejs/undici/blob/c83b084879fa0bb8e0469d31ec61428ac68160d5/lib/core/request.js#L354
    'expect'
];
export const actionsForbiddenHeaders = [
    ...ipcForbiddenHeaders,
    'content-length',
    'set-cookie'
];
export const filterReqHeaders = (headers, forbiddenHeaders)=>{
    // Some browsers are not matching spec and sending Content-Length: 0. This causes issues in undici
    // https://github.com/nodejs/undici/issues/2046
    if (headers['content-length'] && headers['content-length'] === '0') {
        delete headers['content-length'];
    }
    for (const [key, value] of Object.entries(headers)){
        if (forbiddenHeaders.includes(key) || !(Array.isArray(value) || typeof value === 'string')) {
            delete headers[key];
        }
    }
    return headers;
};

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