nginx upstream sent invalid chunked response while reading upstream

错误信息：

upstream sent invalid chunked response while reading upstream, client: 61.157.18.xx, server: xx.xxx.com, request: "POST /api/mechanism/recommender HTTP/1.1", upstream: "http://127.0.0.1:31301/mechanism/recommender", host: "xx.xxx.com", referrer: "http://xx.xxx.com/"

问题排查：
1、通过url能访问，返回数据（curl -X POST “”）
2、通过工具能正常访问

请求协议为http/1.1而nginx代理后默认协议http版本是1.0，不支持分块传输

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解决方案

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改变nginx代理协议

nginx.conf 对应代理请求的location模块里面加上
proxy_http_version 1.1;
#设置Connection为空串,以禁止传递头部到后端
proxy_set_header Connection “”;

重启nginx

nginx -s reload