8000 bug: Multiple cookie wrongly set in a single Set-Header when accessing via ELB · Issue #12633 · localstack/localstack · GitHub
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bug: Multiple cookie wrongly set in a single Set-Header when accessing via ELB #12633

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xtremusphone opened this issue May 17, 2025 · 4 comments
Open
1 task done

bug: Multiple cookie wrongly set in a single Set-Header when accessing via ELB #12633

xtremusphone opened this issue May 17, 2025 · 4 comments
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@bentsku
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aws:elb AWS Elastic Load Balancer status: in progress Currently being worked on type: bug Bug report

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@xtremusphone
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xtremusphone commented May 17, 2025 •
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Is there an existing issue for this?

  • I have searched the existing issues

Current Behavior

The HTTP Set-Cookie header seems to squash multiple Set-Cookie causing browser to only set the first Set-Cookie.
Image

Expected Behavior

Multiple Set-Cookie Header to be set for each of the cookie key / value pair
Image

How are you starting LocalStack?

With the localstack script

Steps To Reproduce

Access via ELB and monitor the HTTP response via network tab in the developer tool

Environment

OS: macOS Sequoia 15.4.1
LocalStack version: 4.3.1.dev89
LocalStack build date: 2025-04-30
LocalStack build git hash: 00c84d961

Anything else?

No response
@xtremusphone xtremusphone added type: bug Bug report status: triage needed Requires evaluation by maintainers labels May 17, 2025
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@bentsku
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bentsku commented May 19, 2025 •
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Hello @xtremusphone and thanks for your report!

Could please confirm from what type of target you are getting the response of in this case? Is it a target for a container?
Thanks!

Note: similar to already solved API Gateway issue #12577

@bentsku bentsku added aws:elb AWS Elastic Load Balancer status: backlog Triaged but not yet being worked on and removed status: triage needed Requires evaluation by maintainers labels May 19, 2025
@bentsku bentsku self-assigned this May 19, 2025
@bentsku bentsku added status: in progress Currently being worked on and removed status: backlog Triaged but not yet being worked on labels May 19, 2025
@xtremusphone
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Hi bentsku,

Yeap the target is an ECS instance (the second screenshot is direct call to the ECS instance)

@bentsku
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bentsku commented May 22, 2025

@xtremusphone thanks for the response! I have a fix in the works, it's probably going to be merged next week, sorry for the delay on that one. I'll update you once it is available in the latest Pro image.

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