Question

How to solve "upstream prematurely closed connection while reading response header from upstream"?

Answer 1

To solve the error message "upstream prematurely closed connection while reading response header from upstream", you can check the server's error logs, increase the server's timeout settings, and adjust the server's buffer size.

Step-by-step explanation:

The error message "upstream prematurely closed connection while reading response header from upstream" usually occurs when there is a problem with the backend server's response to the client's request.

This error can be caused by several factors, such as:

The server timed out before sending a complete response.

The server closed the connection unexpectedly.

The client's request exceeds the server's maximum buffer size.

To solve this issue, you can try the following:

Check the server's error logs for more detailed information about the issue.

Increase the server's timeout settings to allow more time for a response to be sent.

Adjust the server's buffer size to accommodate larger requests.

Answer 2

"Upstream prematurely closed connection while reading response header from upstream" is an error message that can occur when there is a problem with communication between a web server and an upstream server. This can happen for a variety of reasons, including issues with the network connection, problems with the upstream server, or issues with the web server's configuration.

Here are some steps you can try to troubleshoot this error:

Check the network connection: Make sure the network connection between the web server and the upstream server is stable and not experiencing any issues.

Check the upstream server: If the upstream server is experiencing problems or is offline, it may be causing the error. You can try restarting the upstream server or checking its logs for more information.

Check the web server's configuration: Make sure the web server is properly configured to communicate with the upstream server. This may involve checking the web server's configuration files and ensuring that the correct hostname and port are specified for the upstream server.

Check for any error messages in the web server's logs: The web server's logs may contain additional information about the cause of the error.

Check for any system-level issues: If you are using a load balancer or other system-level software, it may be causing the error. You can try restarting or reconfiguring these systems to see if that resolves the issue.

It's also a good idea to check the documentation for the web server and the upstream server to see if there are any known issues or configuration changes that may be causing the error.

Step-by-step explanation: