Differential-ID Header

• Content-ID of the Desired File

• Differential-ID of the Old File

• Observe the Reply Mime-Type

GET /Example/home.html HTTP/1.1

Content-ID: urn:md5:PEFjWBDv/sd9alS9BYuX0w==

Differential-ID: urn:md5:3FS2oCnWPZptpN05oKBemA==

...

HTTP/1.1 200 OK

Content-ID: urn:md5:PEFjWBDv/sd9alS9BYuX0w==

Differential-ID: urn:md5:3FS2oCnWPZptpN05oKBemA==

...

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