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TLDR: AWS ALB incorrectly returns an HTTP 502 error when HTTP headers are too large, instead of the expected HTTP 431.
Just wanted to note that we’ve discovered a small bug in AWS’ ALB. When making an HTTP/1.x request, there exist size limits that are hard limits which cannot be changed. As listed here , they are:
Based on RFC-6585 , the error that should be returned to the client in case of having the headers exceed the limits is the 431 Request Header Fields Too Large error. The RFC states:
A Programmer's Blog Spot