historical unsafe use of HTTP form?uris

During an RDF Data Access WG meeting
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
  -- 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