How to Efficiently Download Large Files in Go Without Overloading Memory?

Efficiently Downloading Large Files with Go

When downloading large files, it is critical to avoid storing the entire content in memory before writing it to a file. This approach can overwhelm the memory and lead to performance issues. In Go, there is a more efficient way to handle this task.

Direct File Storage

To download a large file in Go while storing the content directly to a file, leverage the io.Copy function. Here's a code snippet illustrating how to achieve this:

import (
    "net/http"
    "io"
    "os"
)

func main() {
    out, err := os.Create("output.txt")
    if err != nil {
        // Handle error
    }
    defer out.Close()

    resp, err := http.Get("http://example.com/")
    if err != nil {
        // Handle error
    }
    defer resp.Body.Close()

    n, err := io.Copy(out, resp.Body)
    if err != nil {
        // Handle error
    }

    // Do something with n, e.g. print it
}

In this example, http.Response.Body is a reader that can be used with functions like io.Copy. Instead of loading the entire file into memory, it reads and writes chunks at a time, maximizing memory utilization.

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