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我正在使用 nginx (1.9.3) + php-fpm（通过 unix 套接字）和另一个 nginx 作为反向代理。在从一个子域到另一个子域（cloud.example.com 到 api.example.com）的 XHR 请求net::ERR_INCOMPLETE_CHUNKED_ENCODING期间，我很少收到（大约 100 个请求中的 1个）。OPTIONS此 OPTIONS 请求在 POST 之前自动发送。Chrome 版本 50.0.2661.94（64 位）OS X

反向代理：

location / {
  proxy_pass http://xxx.xxx.xxx.xxx:80;
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection $connection_upgrade;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_redirect off;
  proxy_buffering off;
}

请求标头：

  OPTIONS /my/request/uri HTTP/1.1
  Host: api.example.com
  Connection: keep-alive
  Access-Control-Request-Method: POST
  Origin: https://subdomain.example.com
  User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36
  Access-Control-Request-Headers: accept, content-type
  Accept: */*
  Referer: https://subdomain.example.com/
  Accept-Encoding: gzip, deflate, sdch
  Accept-Language: en-US,en;q=0.8,ru;q=0.6

响应标头：

  HTTP/1.1 200 OK
  Server: nginx
  Date: Fri, 13 May 2016 06:39:05 GMT
  Content-Type: text/html; charset=UTF-8
  Transfer-Encoding: chunked
  Connection: keep-alive
  Vary: Accept-Encoding
  Access-Control-Allow-Origin: https://subdomain.example.com
  Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
  Access-Control-Allow-Credentials: true
  Access-Control-Allow-Headers: Content-Type
  Content-Encoding: gzip
  Strict-Transport-Security: max-age=31536000; includeSubdomains;

我的猜测是这可能是由超时引起的，但我怀疑某处是否存在毫秒超时。下面的屏幕截图来自一个 Chrome 开发者工具网络选项卡，该选项卡被重复多次的相同请求过滤。

Chrome 开发者工具/网络截图

任何帮助深表感谢！

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