This isn't a brain teaser at all. It's a direct test of domain knowledge/experience. There are countless well-documented RoundTripper implementations that hand

This isn't a brain teaser at all. It's a direct test of domain knowledge/experience. There are countless well-documented RoundTripper implementations that handle this case correctly. This is the sort of thing you whip up in three minutes and move along. To me it seems like a perfect test of LLMs. I don't need an injection of something that's worse than stackoverflow polluting the code I work on.