etag-cond-get-example

# 1) Using the resource created in our previous example, do a conditional GET 
#    using the correct current ETag
curl -i -H "If-None-Match:2" localhost:8080/events/55555c2d4c6f98f355b003e

# Since the resource (and ETag) hasn't changed since our last interaction with 
# its state, it only needs to send back a 304 with no response body
HTTP/1.1 304 Not Modified
Server: Apache-Coyote/1.1
ETag: "2"
Last-Modified: ...