TheMovieDB request: If-None-Match ignored

curl -I "https://api.themoviedb.org/3/movie/tt0418279?language=en&api_key=XXXXX" --header 'If-None-Match: "4ef07ac4192010a2e9c6364dfda80162"'
HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Cache-Control: public, max-age=28800
Content-Length: 1458
Content-Type: application/json;charset=utf-8
Date: Sat, 12 Mar 2016 10:05:19 GMT
ETag: "4ef07ac4192010a2e9c6364dfda80162"
Server: openresty
Status: 200 OK
Vary: Accept-Encoding
X-Memc: HIT
X-Memc-Age: 7679
X-Memc-Expires: 21121
X-Memc-Key: c91eb028fdcdc61bc2069f27a11d4bf5
X-RateLimit-Limit: 40
X-RateLimit-Remaining: 39
X-RateLimit-Reset: 1457777129
Connection: keep-alive