HTTP/1.1 Caching
Use Vary Header in HTTP Reply
Use of ETag is Not Optimal
HTTP/1.1 200 OK
Vary: Content-ID
Content-ID: urn:md5:PEFjWBDv/sd9alS9BYuX0w==
...
HTTP/1.1 200 OK
Vary: Content-ID,Differential-ID
Content-ID: urn:md5:PEFjWBDv/sd9alS9BYuX0w==
Differential-ID: urn:md5:3FS2oCnWPZptpN05oKBemA==
...
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