nginx负载均衡、长链接，默认会使用http1.0链接下游服务

1.官网 http://nginx.org/en/docs/http/ngx_http_upstream_module.html http://nginx.org/en/docs/ http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_versionhtml 2.参考文档 https://www.cnblogs.co

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