How to remove argument from request line?

[Anatoli Marinov]

Hi,
I am writing a custom module for nginx which should remove particular
arguments from request line when request is sending to the origin through
upstream on cache miss. Proxy cache is used. In general I want to remove
start=XXX argument.
My handler is attached in rewrite phase and I tryed to modify r->args but
on my origin I received unmodified request string. I guess this is not the
right way.

Could you advise me how I can achieve this?

Thank in advance
Anatoli Marinov
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