I think you will need to parse the request yourself. HTTP::Headers actively (re)orders the headers on output, and I found overriding that to be nigh-impossible without cut'n'pasting lots of the relevant code out of HTTP::Headers.

From looking at the source, HTTP::Headers::Util might be suitable to implement your own header parsing.

In reply to Re: Get the order of HTTP request headers by Corion
in thread Get the order of HTTP request headers by arc_of_descent

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