How Can I Prevent 'Connection Reset by Peer' Errors When Using Go's `http.Get()`?

Connection Reset by Peer with Go's HTTP Request Handling

When utilizing Go's http.Get() function for efficient web page downloading, it's crucial to address the potential error "connection reset by peer." This error occurs when the remote server abruptly closes the connection, often due to resource constraints or connection limits.

To prevent this issue, consider the following recommendations:

1. Optimize Concurrency Level:

Starting a large number of concurrent connections (1000-2000) may exceed the optimal concurrency level for efficient downloading. Determine the optimal level through performance testing.

2. Set Transport Properties:

Configure the Transport.MaxIdleConnsPerHost property to match the concurrency level. If this value is too low, server connections will be repeatedly closed and reopened, hindering performance.

3. Consider Latency and Geography:

Your observation of successful downloads when the server and website were located in the same country suggests that latency and geographic distance may impact connection reliability. If possible, consider running your program on a server closer to the website's hosting location.

4. Implement Retry Logic:

In cases where connection resets occur despite the above measures, implementing retry logic can mitigate the impact. Automatically retry failed requests for a limited number of times before marking them as failed.

By following these recommendations, you can effectively prevent the "connection reset by peer" error and optimize the performance of your web page downloading process using Go's http.Get() function.

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