> On Sep 27, 2015, at 10:43 PM, Gerriet M. Denkmann <gerr...@mdenkmann.de> 
> wrote:
> 
> The NSHTTPURLResponse allHeaderFields dictionary contains keys like: 
> “Content-Length” and “Last-Modified”.
> Are these standardized or might other sites use other keys like 
> “Modification-Date” or “Nbr-of-Bytes” ?

Oh my yes, they’re standardized. :) This is the HTTP 1.1 protocol you’re 
looking at, the backbone of the Web. RFCs 7230-7237. HTTP response headers are 
specified in:
        https://tools.ietf.org/html/rfc7231#section-7

—Jens
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