Why is a PNG image downloaded by reqwest corrupt?

Question

I am following the code mentioned in Rust Cookbook at https://rust-lang-nursery.github.io/rust-cookbook/web/clients/download.html to download a file in async way by HTTP GET request.

My code is as follows:

#[tokio::main]
async fn main() -> Result<()> {

    let object_path = "logos/rust-logo-512x512.png";
    let target = format!("https://www.rust-lang.org/{}", object_path);  
    let response = reqwest::get(&target).await?;

    let mut dest = {
    
        let fname = response
            .url()
            .path_segments()
            .and_then(|segments| segments.last())
            .and_then(|name| if name.is_empty() { None } else { Some(name) })
            .unwrap_or("tmp.bin");
            
            
        println!("file to download: '{}'", fname);

        let object_prefix = &object_path[..object_path.rfind('/').unwrap()];
        let object_name = &object_path[object_path.rfind('/').unwrap()+1..];
        let output_dir = format!("{}/{}", env::current_dir().unwrap().to_str().unwrap().to_string(), object_prefix);
        fs::create_dir_all(output_dir.clone())?;

        println!("will be located under: '{}'", output_dir.clone());
                
        let output_fname = format!("{}/{}", output_dir, object_name);
        println!("Creating the file {}", output_fname);
        
        File::create(output_fname)?
        
    };
    let content =  response.text().await?;
    copy(&mut content.as_bytes(), &mut dest)?;
    Ok(())
}

It creates the directories & downloads the file. However, when I open the file, it displays corrupt file error I have tried to use some other URL also, but the corrupt file issue is still there

Am I missing something in the code?

Answer 1

Just using bytes and Cursor work too, and it is simpler:

let mut content =  Cursor::new(response.bytes().await?);
copy(&mut content, &mut dest)?;