How Can I Solve the \'Use of Closed Network Connection\' Error in Go\'s net/http Package?

Addressing "Use of Closed Network Connection" Error in net/http

The "use of closed network connection" error in net/http indicates a common issue encountered during high-traffic web applications. Here's an analysis of the potential causes and solutions:

The error message arises when the server attempts to execute an operation on a connection that has already been closed. This can occur for various reasons, including:

Connection Handling

The provided code snippet demonstrates a common request pattern where a new HTTP client is created for each request. This approach can lead to a large number of open connections, which can overwhelm the server's resources. Instead, consider implementing a connection pool to manage a limited number of connections.

Closing Connections Prematurely

The use of defer resp.Body.Close() can lead to the connection being closed before operations on the response body are complete. Ensure that all operations using the response body are finished before closing the connection.

Configuring System Parameters

Review the system parameters configured through sysctl -p to ensure they are optimized for the expected traffic load. In particular, parameters such as net.core.somaxconn and net.core.netdev_max_backlog should be configured to handle the expected number of concurrent connections.

Network Optimization

Changes in the network configuration can also impact connection stability. Consider implementing failover mechanisms or load balancing to distribute traffic across multiple servers.

Code Refactoring

To mitigate the error, consider refactoring the code to implement retry logic with backoff. This allows the application to automatically handle temporary network issues and ensure resilience against connection failures.

By implementing these measures, it is possible to significantly reduce the occurrence of "use of closed network connection" errors and improve the stability of high-traffic web applications.

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