Setting multiple cookie in same request not working

[anilmagzter]

If we set more than one cookie in the same request, only the last one is used.

For example
cookies.set('first', 'true', { path: '/' });
cookies.set('second', 'selected', { path: '/' });

Only the 'second' cookie is in the response and 'first' is ignored. Is it related to sveltejs/kit#3460 (comment)

[jill64]

Thank you for opening this issue!

I have confirmed that the problem occurs.
Note the location of the obstruction for your records.

1. Buffered Response

It appears that the Set-Cookie header needs to be set using the cookie field.

sveltekit-adapter-aws/embed/arch/lambda-s3-buffered.ts

Lines 49 to 53 in 3f7976e

	return {
	statusCode: response.status,
	headers: Object.fromEntries(response.headers),
	body: await response.text()
	} satisfies LambdaResponsePayload

It is planned to be implemented in v1.6.0.

2. Streaming Response

I did some research, but couldn't find a workaround.

https://aws.amazon.com/blogs/compute/introducing-aws-lambda-response-streaming/

It seems like there needs to be a way to set cookies other than using standard headers.

sveltekit-adapter-aws/embed/external/utils/qualified.ts

Lines 6 to 21 in 3f7976e

	export const qualified = (
	responseStream: ResponseStream,
	{
	awslambda,
	statusCode,
	headers
	}: {
	statusCode: number
	headers: Record<string, string>
	awslambda: typeof AwsLambda
	}
	) =>
	awslambda.HttpResponseStream.from(responseStream, {
	statusCode,
	headers
	})

Does anyone know a solution regarding this?

[jill64]

edge-bundled is not working as well

[jill64]

After researching, it seems that with Lambda@edge and streaming responses, only a single key can be specified in HTTP headers, and multiple cookies cannot be returned.

This is an issue with the AWS Lambda platform and seems difficult to work around.

[jill64]

It was possible to return multiple headers with Lambda@Edge.
Available in v1.7.2.
I will continue to investigate the use of streaming responses.

[jill64]

It was possible to return multiple cookies with streaming response.
Available in v1.8.0