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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
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.
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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Thank you.