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This library is incredibly useful when working with HTTP headers. It allows you to get/set/check for headers in a caseless manner while also preserving the caseing of headers the first time they are set.
Has takes a name and if it finds a matching header will return that header name with the preserved caseing it was set with.
Set is fairly straight forward except that if the header exists and clobber is disabled it will add ‘’,'+value` to the existing header.
Swaps the casing of a header with the new one that is passed in.