The HTTP headers which control how an HTML 5 document is displayed might look like this:
Content-Type: application/xhtml+xml; charset=UTF-8
Cache-Control: max-age=120
X-UA-Compatible: IE=8
It is highly recommended that the charset
attribute specifying the character encoding of the HTML page be included in the Content-Type
header for non-XML user agents in addition to the xml declaration.
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