How to Efficiently Download Large Files in Go Without Loading Them into Memory?

Techniques for Efficient Large File Downloads in Go

When downloading substantial files, it can be crucial to avoid loading the entire file into memory, as it may exhaust system resources. In Go, there are effective strategies to download large files and write them directly to their destination.

Storing Content Directly to File

The primary technique for direct storage involves using the os.Create function to create a file and then leveraging io.Copy to write data from the network to the file. This approach is illustrated in the code snippet:

// Create output file
out, err := os.Create("output.txt")
defer out.Close()

// Download file via HTTP
resp, err := http.Get("http://example.com/")
defer resp.Body.Close()

// Write data directly to file
_, err := io.Copy(out, resp.Body)

This approach allows for efficient downloading and direct storage to the destination file.

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