[openstreetmap-website] Content-Length on HEAD requests (#406)

[Tom Hughes]

I think the answer is that rails doesn't actually set `Content-Length` at all and what we are seeing is what apache/passenger/webrick are then inventing based on the size of the data.

Of course for a `HEAD` rails has already discarded the body, hence no length (or a zero length).

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https://github.com/openstreetmap/openstreetmap-website/issues/406#issuecomment-21921740
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