Cant set multiple cookies in one request

When you set multiple cookies it only sets the first one. I have an application that has a csrf middleware, it one of the first middleware to be initialized. My app has a route where a we set a token then redirect to another page in the app, whats happening is the csrf middleware runs before the route function handler. The middleware sets a cookie, then the route function runs sets another cookie, then a redirect happens.

```
res.cookie("token", token, defaultCookieOpts));
```

SERVERLESS_EXPRESS:FORWARD_REQUEST_TO_NODE_SERVER:RESPONSE
```
_header: 'HTTP/1.1 302 Found\r\n' +
'X-DNS-Prefetch-Control: off\r\n' +
'X-Frame-Options: SAMEORIGIN\r\n' +
'Strict-Transport-Security: max-age=15552000; includeSubDomains\r\n' +
'X-Download-Options: noopen\r\n' +
'X-Content-Type-Options: nosniff\r\n' +
'X-XSS-Protection: 1; mode=block\r\n' +
'Referrer-Policy: same-origin\r\n' +
'Surrogate-Control: no-store\r\n' +
'Cache-Control: no-store, no-cache, must-revalidate, proxy-revalidate\r\n' +
'Pragma: no-cache\r\n' +
'Expires: 0\r\n' +
'Set-Cookie: _csrf=3A2IecjCunSB9Sq2rI-i-Ani; Path=/; SameSite=Strict\r\n' +
'Set-Cookie: token= on3N6MSlyG; Path=/; Expires=Fri, 31 Dec 9999 00:00:00 GMT\r\n' +
'Location: tx/austin/math-tutors/pro-1-fFWS9tC-z?leadKey=6lfLJiBTmXR&service=UCT7ybWAds\r\n' +
'Vary: Accept\r\n' +
'Content-Type: text/html; charset=utf-8\r\n' +
'Content-Length: 204\r\n' +
'Date: Tue, 20 Dec 2022 07:48:30 GMT\r\n' +
'Connection: keep-alive\r\n' +
'\r\n',
_keepAliveTimeout: 0,
_onPendingData: [Function: noopPendingOutput],
_sent100: false,
_expect_continue: false,
req: IncomingMessage {
_readableState: [ReadableState],
_events: [Object: null prototype] {},
_eventsCount: 0,
_maxListeners: undefined,
socket: [Object],
httpVersionMajor: '1',
httpVersionMinor: '1',
httpVersion: '1.1',
complete: true,
headers: [Object],
rawHeaders: [],
trailers: {},
rawTrailers: [],
aborted: false,
```

```
DEBUG {
message: 'SERVERLESS_EXPRESS:FORWARD_RESPONSE:EVENT_SOURCE_RESPONSE_PARAMS',
statusCode: 302,
body: '[BASE64_ENCODED]',
headers: [Object: null prototype] {
'x-dns-prefetch-control': 'off',
'x-frame-options': 'SAMEORIGIN',
'strict-transport-security': 'max-age=15552000; includeSubDomains',
'x-download-options': 'noopen',
'x-content-type-options': 'nosniff',
'x-xss-protection': '1; mode=block',
'referrer-policy': 'same-origin',
'surrogate-control': 'no-store',
'cache-control': 'no-store, no-cache, must-revalidate, proxy-revalidate',
pragma: 'no-cache',
expires: '0',
'set-cookie': [
'_csrf=3A2IecjCunSB9Sq2rI-i-Ani; Path=/; SameSite=Strict',

'token=on3N6MSlyG; Path=/; Expires=Fri, 31 Dec 9999 00:00:00 GMT'
],
location: '/pros/leads',
vary: 'Accept',
'content-type': 'text/html; charset=utf-8',
'content-length': '66'
},
isBase64Encoded: true
}
```
```
DEBUG {
message: 'SERVERLESS_EXPRESS:FORWARD_RESPONSE:EVENT_SOURCE_RESPONSE',
successResponse: '{\n' +
' statusCode: 302,\n' +
" body: 'PHA+Rm91bmQuIFJlZGlyZWN0aW5nIHRvIDxhIGhyZWY9InR4L2F1c3Rpbi9tYXRoLXR1dG9ycy9wcm8tMS1mRldTOXRDLXo/bGVhZEtleT02bGZMSmlCVG1YUiZhbXA7c2VydmljZT1VQ1Q3eWJXQWRzIj50eC9hdXN0aW4vbWF0aC10dXRvcnMvcHJvLTEtZkZXUzl0Qy16P2xlYWRLZXk9NmxmTEppQlRtWFImYW1wO3NlcnZpY2U9VUNUN3liV0FkczwvYT48L3A+',\n" +
' headers: {\n' +
" 'x-dns-prefetch-control': 'off',\n" +
" 'x-frame-options': 'SAMEORIGIN',\n" +
" 'strict-transport-security': 'max-age=15552000; includeSubDomains',\n" +
" 'x-download-options': 'noopen',\n" +
" 'x-content-type-options': 'nosniff',\n" +
" 'x-xss-protection': '1; mode=block',\n" +
" 'referrer-policy': 'same-origin',\n" +
" 'surrogate-control': 'no-store',\n" +
" 'cache-control': 'no-store, no-cache, must-revalidate, proxy-revalidate',\n" +
" pragma: 'no-cache',\n" +
" expires: '0',\n" +
" 'set-cookie': '_csrf=3A2IecjCunSB9Sq2rI-i-Ani; Path=/; SameSite=Strict',\n" +
" location: 'tx/austin/math-tutors/pro-1-fFWS9tC-z?leadKey=6lfLJiBTmXR&service=UCT7ybWAds',\n" +
" vary: 'Accept',\n" +
" 'content-type': 'text/html; charset=utf-8',\n" +
" 'content-length': '204'\n" +
' },\n' +
' multiValueHeaders: undefined,\n' +
' isBase64Encoded: true\n' +
'}',
body: '[BASE64_ENCODED]'
}
```

Không có tệp nguồn hoặc bài kiểm thử nào được nêu tên. Hãy bắt đầu bằng cách theo dõi cách serverless-express chuyển đổi các header phản hồi của Express thành phản hồi AWS, tập trung vào mảng set-cookie và multiValueHeaders được hiển thị trong log. Tái hiện một chuyển hướng thiết lập cả cookie CSRF và cookie token, sau đó xác minh rằng phản hồi được chuyển tiếp vẫn giữ lại cả hai cookie.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.