How Can I Avoid 'Connection Reset by Peer' Errors When Downloading Many Webpages Concurrently in Go?

Go http.Get, Concurrency, and "Connection Reset by Peer"

When executing a program to download a significant number of webpages from a remote server using Go routines and channels, you may encounter the "connection reset by peer" error in some requests. This issue arises when the server closes the connection abruptly, often due to connection limits or resource constraints.

One possible reason for the error is establishing too many parallel connections. Starting 1000-2000 connections simultaneously is typically inefficient and can overwhelm the server's resources. Determining the optimal concurrency level through testing will improve throughput and reduce the risk of connection resets.

Additionally, setting the Transport.MaxIdleConnsPerHost parameter is crucial to avoid unnecessary connection closures. If this value is less than the concurrency level, connections will frequently close after each request and then reopen immediately. This extra overhead can significantly slow down the download process.

To mitigate the "connection reset by peer" error, consider optimizing the concurrency level and adjusting the Transport.MaxIdleConnsPerHost setting to match the expected number of concurrent connections. By managing connections effectively, you can improve the reliability and efficiency of your web page download process.

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