How to Prevent 'panic: runtime error: invalid memory address or nil pointer dereference' when Handling HTTP Responses in Go?

Go: Handling HTTP Response Errors

When executing HTTP requests in Go, it's essential to handle errors returned by the (*Client).Do method. This ensures that errors are detected and handled appropriately.

In the provided code, you're experiencing the error: "panic: runtime error: invalid memory address or nil pointer dereference." This suggests that res.Body is being accessed before checking for an error.

To address this, it's crucial to check the error returned by client.Do immediately. Here's the revised code:

res, err := client.Do(req)
if err != nil {
    return nil, err
}
defer res.Body.Close()

By checking for errors immediately, you can handle them gracefully and prevent panics. In this case, the error is caused by accessing res.Body before checking for an error. Therefore, the program will terminate prematurely without providing any useful information.

By following these guidelines, you can ensure that HTTP requests are handled correctly, and errors are properly detected and managed.

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