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preflight: cap Access-Control-Request-Headers length - #48
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A 1MiB comma-only ACRH made parseHeaderList allocate tens of MiB. Abort preflight when the header is longer than 1KiB, as a Fetch browser would never send that. Fixes go-chi#36.
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A 1MiB comma-only Access-Control-Request-Headers value made parseHeaderList allocate on the order of tens of MiB.
Abort the preflight (same as a disallowed header list) when ACRH is longer than 1KiB. That is enough for a real Fetch preflight and matches what was suggested on the issue.
Fixes #36.