Design / Delta-Base (RFC 3229)
The Delta-Base entity-header field is used in a delta-encoded response to specify the entity tag of the base instance. A Delta-Base header field MUST be included in a response with an IM header that includes a delta-coding, if the request included more than one entity tag in its If-None-Match header field. Any response with an IM header that includes a delta-coding MAY include a Delta-Base header.
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