de-capitalizing headers produces server errors with some backends

[bradgearon]

suggestion is to use title case or not modify headers that have been set
does this seem plausible?

[greim]

Node's http module translates incoming header names to lowercase. nodejs/node-v0.x-archive#1954

So we're stuck with this behavior under node v0.10 but apparently, coming versions will provide a rawHeaders property which should allow Hoxy to pass header names unmodified. I'll leave this open for now and at some point need to ensure tests pass on bleeding-edge node, then can address this issue. (At which point the fix will entail using node v0.11.x or higher)

[sholladay]

Node 0.12.0 is out and support for this is now possible, for anyone willing to implement it.
https://nodejs.org/api/http.html#http_message_rawheaders

When doing so, I would personally appreciate making it configurable, since this is spec breaking behavior.

[greim]

@sholladay - As long as headerReceived.toLowerCase() === headerSent.toLowerCase() would it be spec-breaking? I probably need to read up on the nuances but was under the impression headers were case insensitive, e.g. CoNtEnT-TyPe would be spec-valid (although not probably handled well by some servers in the wild).

[sholladay]

Correct. What I mean to say is that needing this as a feature is effectively spec-breaking, as it shows you are failing to NOT care about the casing of headers. But I do like choices and for a proxy in particular, it makes sense to be as transparent as possible unless otherwise desired.