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docs(elb): document ALB multi-listener port-based routing (DOC-310)#772

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doc-310-fix-elbv2-alb-listener-port-routing
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docs(elb): document ALB multi-listener port-based routing (DOC-310)#772
quetzalliwrites wants to merge 1 commit into
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doc-310-fix-elbv2-alb-listener-port-routing

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Summary

  • Adds a new Multiple Listeners and Port-Based Routing section to the ELB service page
  • Documents that same-scheme ALB listeners are now routed by the request's arrival port (fixed in localstack-pro/pull/7546)
  • Explains the GATEWAY_LISTEN requirement for making multiple same-scheme listeners reachable
  • Documents the by-design fallback behavior when requests arrive on the shared :4566 port
  • Includes a recommendation to consolidate to a single listener when using only the default gateway port

Closes https://linear.app/localstack/issue/DOC-310/doc-fix-elbv2-select-alb-listener-by-the-requests-arrival-port-aws

Test plan

  • Verify the new section renders correctly on the ELB docs page
  • Verify the GATEWAY_LISTEN link resolves to the correct configuration anchor
  • Run npm run build to confirm no broken links

🤖 Generated with Claude Code

Add a new section explaining how LocalStack routes requests to same-scheme
ALB listeners by arrival port, the GATEWAY_LISTEN requirement for
multi-listener setups, and the by-design fallback behavior on the shared
:4566 gateway port.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@quetzalliwrites

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FYI: this PR was created with the new MVP docs agent

@quetzalliwrites quetzalliwrites self-assigned this Jul 8, 2026
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