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This is a confirmed bug. Following can demonstrate it:
curl -I "http://mybuildserver:8080/buildStatus/icon?job=myjob"
HTTP/1.1 200 OK
ETag: /static/1a041373/success.png
Expires: Fri, 01 Jan 1984 00:00:00 GMT
Content-Type: image/png
Content-Length: 2339
Server: Jetty(8.y.z-SNAPSHOT)
As you can see,
Cache-Control: no-cache is omitted and not returned, causing github to cache the image.