Documentation fix - Mux Signature with wrong casing

[iamvajid]

Not sure if it was intentionally kept so in the documentation, feel free to reject if so. The example below was correct, but the explanation used capital casing which won't be a valid header Node/Express

[dylanjha]

@iamvajid thanks for pointing this out.

The key for the header on the request is Mux-Signature. I want to be clear about that. But I think express downcases all the headers automatically, is that true?

[iamvajid]

Yes @dylanjha , in express, the headers comes in lower-case, but i doubt if its express doing it. Looks like its the underlying http module of node.js as seen here nodejs/node-v0.x-archive#1954. And it seems the spec mentions that headers are case-insensitive (Ref: https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html). So ideally, the comparison itself should be ignoring the case, which could be the reason why http module was implemented like this

[iamvajid]

Just wanted to mention that i double-checked and confirmed that its the behaviour of node and not just express