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historical unsafe use of HTTP form?uris

From: Dan Connolly <connolly@w3.org>
Date: Mon, 24 May 2004 12:56:04 -0500
To: www-tag@w3.org
Message-id: <1085421364.32018.1204.camel@dirk>

During an RDF Data Access WG meeting
  http://www.w3.org/2001/sw/DataAccess/ftf1#tech-survey
somebody pointed out this bit of the HTTP spec:

"We note one exception to this rule: since some applications have
traditionally used GETs and HEADs with query URLs (those containing a
"?" in the rel_path part) to perform operations with significant side
effects, caches MUST NOT treat responses to such URIs as fresh unless
the server provides an explicit expiration time."
 -- http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.9

Perhaps it's worth noting near...

"HTTP GET is safe; i.e., agents do not incur obligations by following
links."
  -- http://www.w3.org/2001/tag/doc/whenToUseGet.html



-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Monday, 24 May 2004 14:06:58 UTC

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