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This problem happened because your upstream (php, php-fpm) max_execution_time is shorter than proxy_connect_timeout in your nginx proxy.

For example:

In my php.ini:

max_execution_time = 30

But in mysite.conf have:

location / {
     proxy_set_header        Host $server_name;
     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_pass http://localhost:8080;
     proxy_read_timeout 300; 
     proxy_connect_timeout 300;  # <== this
     proxy_request_buffering off;
     proxy_buffering off;
     proxy_redirect off;

Then I got in error.log of nginx:

[error] 117#117: *434 upstream prematurely closed connection while sending to client….

To resolve this problem, increase your max_execution_time to 300.

That all!

Additional info:

Việt Nam Tutor

Hi, mình là Anthony Nguyễn. Hiện đang là Full Stack Developer. Mong được giao lưu với bạn đọc và nhận được nhiều gạch đá, xi măng, sỏi để xây biệt thự:)

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