Item and Bitstream pages do not provide Last-Modified HTTP header, nor
recognize If-Modified-Since
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Key: DS-285
URL: http://jira.dspace.org/jira/browse/DS-285
Project: DSpace 1.x
Issue Type: Bug
Components: XMLUI
Affects Versions: 1.5.2, 1.6.0
Environment: n/a
Reporter: Larry Stone
It is important to use the HTTP Last-Modified/If-Modified-Since conventions to
help Web crawlers avoid requesting and downloading resources that haven't
changed since their last visit -- it saves time and CPU load for the DSpace
site too. The JSPUI implements this protocol on /handle and /bitstream
servlets, since the Item splash page and Bitstream downloads are responsible
for most of the load.
The XMLUI needs to do this too:
1. Requests that return the content of an Item or Bitstream must return a
"Last-modified" header with the Item's last-modified date
2. When receiving a request with an "If-Modified-Since" header, first compare
that date to the Item's last-modified; if the header is later, return a 304
status instead of processing the request.
Note that the XMLUI's Sitemap implementation already does the right thing.
I'll look into implmenting this for 1.6 if nobody else jumps on it first, but
right now I only have time to post it.
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