the native Nginx, I used then built a PHP7 environment on the machine with Docker. Php-fpm was started in Docker and the port was mapped. The host 9200 was mapped to 9000 in the container and added a code directory to the data volume. However, an error was reported in the php in the docker with native nginx access. The port of nginx access php-fpm uses the mapped port, fastcgi_pass 127.0.0.1 fastcgi_pass 9200;

nginx is as follows:

2018-06-06 20:36:52 [error] 81417 upstream prematurely closed connection while reading response header from upstream, client: sharp0: * 500 upstream prematurely closed connection while reading response header from upstream, client: 127.0.0.1, server: wq.cn, request: "GET / / test.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9200"

can connect to it, which probably means that the connection is closed prematurely when the response header is read from the upstream. Look up the solution on the Internet, did not find, I do not know if there is a god can help solve it, thank you very much!