Lambda function URL not returning multiple cookies
I have a Lambda function URL that needs to return multiple cookies. Unlike API Gateway, it would appear that there may be a bug in the Lambda function URL code. I have the following sample code
def lambda_handler(event, context):
return {
'statusCode': 200,
'headers': {
'Content-Type': 'text/html',
'Set-Cookie' : [
'cookie1=hello; Secure; HttpOnly;',
'cookie2=howdy; Secure; HttpOnly;'
]
},
'body': '<html><h1>Hello</h1><p>Lambda rocks!</p></html>'
}
When executing the URL (eg curl https://xxxxx.lambda-url.ap-southeast-2.on.aws/ -v 2>&1 | grep "set-cookie") I would expect to see something like
set-cookie: cookie1=hello; Secure; HttpOnly;
set-cookie: cookie2=howdy; Secure; HttpOnly;
Instead, the function URL mangles up the output, and returns something like this
set-cookie: [cookie1=hello; Secure; HttpOnly;, cookie2=howdy; Secure; HttpOnly;]
There is precedent for using multiValueHeaders with Lambda through API gateway (see https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-output-format) yet the same functionality does not appear to exist on Lambda Function URLs.
Have you been able to send multiple cookies from a Lambda function through the function URLs, and how were you able to achieve it in your environment?
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Use multiValueHeaders instead of headers..
const response = {
statusCode: 200,
multiValueHeaders : {"Set-Cookie": [`language=${language}`, `theme=${theme}`]},
body: JSON.stringify('User profile set successfully')
};
So multivalueValueHeaders doesnt work as per format 2.0:
Which points you to use "cookies" field:
Which also doesn't work which leaves us with "case iteration":
# python 3
response = {
"statusCode": 200,
"headers": {
"Set-cookie": "cookie1=1",
"SEt-cookie": "cookie2=2",
"SET-cookie": "cookie2=2"
}
}
Or library that maybe accomplishes above:
As per the 2.0 format, you can you the cookies attribute:
{
"statusCode": 200,
"body": "<html><div><b>V2</b></div></html>",
"headers": {
"Content-Type": "text/html"
},
"cookies": [
"CloudFront-Key-Pair-Id=foo; Path=/",
"CloudFront-Policy=foo; Path=/",
"CloudFront-Signature=foo; Path=/"
]
}
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This approach isn't working for me. It's the correct approach in API Gateway, but the
multiValueHeaderskey seems to be ignored on Lambda Function URLs.