Dell DX6000 Application Manual
Download Application manual of Dell DX6000 Desktop, Server for Free or View it Online on All-Guides.com.
Brand: Dell
Category: Desktop , Server , Software , Storage
Type: Application manual
Model: Dell DX6000 , Dell DX6004S , Dell DX6012S
Pages: 81 (0.65 Mb)
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Copyright © 2010 Caringo, Inc.
All rights reserved 69
Version 5.0
December 2010
The value of the header can be either a single quoted string (possibly with some ignored flags
outside the quotation marks) or an HTTP-date string (unquoted).
Examples of If-Range request headers:
If-Range: "508941dc9b52243f64d964b058354b76"
If-Range: W/"508941dc9b52243f64d964b058354b76"
If-Range: Tue, 07 Jul 2009 16:25:24 GMT
If a client has a partial copy of an object in its cache, and wishes to have an up-to-date copy of the
entire object in its cache, it could use the Range request-header with a conditional GET (using either
or both of If-Unmodified-Since and If-Match.) However, if the condition fails because an anchor
stream has been updated, the client would then have to make a second request to obtain the entire
current object. The If-Range header allows a client to "short-circuit" the second request. Informally,
its meaning is `if the object is unchanged, send me the part(s) that I am missing; otherwise, send me
the entire object'.
If the client has no entity tag for an object, but does have a Last-Modified date, it may use that date
in an If-Range header. DX Storage can distinguish between a valid HTTP-date and any form of
entity-tag by looking for double quotes. The If-Range header should only be used together with a
Range header, and will be ignored if the request does not include a Range header.
If the entity tag given in the If-Range header matches the current primary UUID of the object, or the
HTTP-date given is not before the Last-Modified date of the object, then DX Storage will provide
the specified sub-range of the object using a 206 Partial content response. If the entity tag does not
match, then DX Storage will return the entire object using a 200 OK response.