add limit_upstream to nginx

Chuanwen Chen chencw1982 at
Thu Jun 16 04:03:07 UTC 2016

I wrote a module for nginx 4 years ago which limited the number of
connections to upstream in order that the upstream servers would not be too
busy to work efficiently. Now I think this module is stable, and expect it
to be merged into nginx official if possible.

the code is here:

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