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

[Tom Hughes]

Having said that I really don't see how this can happen, because the rails code is:

```ruby
    def call(env)
      if env["REQUEST_METHOD"] == "HEAD"
        env["REQUEST_METHOD"] = "GET"
        env["rack.methodoverride.original_method"] = "HEAD"
        status, headers, _ = @app.call(env)
        [status, headers, []]
      else
        @app.call(env)
      end
    end
```

which clearly preserves headers and discards the body.

I also don't actually see what you describe as I see no `Content-Length` header at all in the `HEAD` case - maybe apache is discarding it?


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