feat(rpc): support the If-None-Match request header

Kevin Morrisrequested to merge
kevr/aurweb:pu-rpc-if-none-match into pu

If the If-None-Match header is supplied with a previously obtained ETag from the same query, a 304 Not Modified is returned with no content.

This allows clients to completely leverage the ETag header.

Signed-off-by: Kevin Morris kevr@0cost.org

P.S. snuck in a fix for JSONP callback.

Edited by Kevin Morris

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