I suspect that content-type should be case insensitive

[MichaelWehar]

node-XMLHttpRequest/lib/XMLHttpRequest.js

Line 369 in 97966e4

if (!this.getRequestHeader("Content-Type")) {

Currently, it appears that it assumes content-type is written as "Content-Type".

[MichaelWehar]

See here: https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2

"Field names are case-insensitive."

[MythicManiac]

I just hit a bug due to this, a client was setting content-type instead of the Content-Type that was being checked for, causing breakage.