How to Handle 'Connection Reset by Peer' Errors in Concurrent Go HTTP Requests?

Concurrent Go HTTP Requests with "Connection reset by peer"

Despite using goroutines and channels to enhance efficiency in downloading webpages, users face persistent connection reset errors. This issue, particularly evident when accessing a server from a distant continent, raises the question: How can we alleviate this problem?

Cause:

The "connection reset by peer" message indicates that the remote server abruptly closed the connection. This can occur due to connection limits imposed by the server or resource constraints.

Solution:

1. Optimize Concurrency:

Rather than initiating thousands of connections simultaneously, experiment with different levels of concurrency to determine the most optimal amount. Excessive concurrency can strain resources and slow progress.

2. Set MaxIdleConnsPerHost:

Configure the http.Transport.MaxIdleConnsPerHost parameter to align with your concurrency level. If this value is set lower than the number of concurrent connections, server connections may be closed after each request, only to be reopened immediately. This negatively impacts throughput and potentially leads to server connection limits being reached.

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