Name
If-Range: (entity_tag | date)
Synopsis
A conditional requesting only the portion of the entity that is
missing, if it has not been changed, and the entire entity if it has.
Used in conjunction with the Range header to
indicate the entity tag or last modified time of a document on the
server. For example:
If-Range: Mon, 04 May 1996 12:17:34 GMT
If the document has not been modified, the server returns the byte
range given by the Range header; otherwise, it
returns all of the new document. Either an entity tag or a date can
be used to identify the partial entity already received; see the
Date header for information on the format for
dates.
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