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The URL that link to directories and not to files end with a slash (“/”).
prevents a back and forth exchange with the server which will look for a file and not a directory. Download time is thus reduced.
The links towards the exemple directory have the following syntax : <a href="http://example.org/exemple/">...</a> and not <a href="http://example.org/exemple">...</a>.
Use the W3C link validator which indicates directories that haent been closed by a slash / http://validator.w3.org/checklink/