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: *https://github.com/cfsego/nginx-limit-upstream <https://github.com/cfsego/nginx-limit-upstream>* sincerely
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