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Does ALB (target group) support 103 Early Hints?

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My server app is returning 103 response header but the balancer doesn't understand it. Is there any possibility to enable this? Thanks.

asked 3 years ago1K views
2 Answers
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Accepted Answer

Thank you for the details.

103 Early Hints mentioned in RFC 8297 is still experimental and yet to be supported by ALB. If the layer 7 features provided by ALB aren't integral to your application, you might want to consider using NLB, which operates at the transport layer (layer 4) and may accommodate your load balancing needs more effectively during this period.

RFC: https://datatracker.ietf.org/doc/html/rfc8297#page-3

Mozilla: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103

AWS
answered 3 years ago
EXPERT
reviewed 2 years ago
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To best of my knowledge, in AWS this can be achieved either though Cloudfront or Lambda@edge. I didn't find any reference as well, where this is discussed for ALB/target group.

AWS
EXPERT
answered 3 years ago
  • The fact is that this is not suitable for applications deployed in ECS.

  • Oh I see, then I think we don't have much options if neither of these can be used.

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