nginx proxy cache support contional request( If-Modified-Since)

[冯顾]

Hi, 


I'm using nginx as a reverse proxy with cache. My content almost never changes. So I want to use a conditional GET request when fetch content from backend.
However, nginx don't support it. Who have a such patch for it? Can give me? Thanks. 


PS, I want to know someday nginx will implement it or refuse to implement it?


Thank you.
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