Function download 

pub fn download(
    target: &str,
    proxy: ProxyConfig,
    _optimizer: Optimizer,
    options: DownloadOptions,
    status_callback: Option<&(dyn Fn(String) + Send + Sync)>,
) -> Result<(), Box<dyn Error + Send + Sync>>

Download a file from a URL with automatic retry and progress tracking.

This is the simple download function for basic use cases. For parallel connections and resume support, use AdvancedDownloader.

Arguments

• target - URL to download
• proxy - Proxy configuration (use ProxyConfig::default() for no proxy)
• _optimizer - Optimizer instance (reserved for future use)
• options - Download options (quiet mode, output path, ISO verification)
• status_callback - Optional callback for status messages

Example

use kget::{download, DownloadOptions, ProxyConfig, Optimizer};

download(
    "https://releases.ubuntu.com/22.04/ubuntu-22.04-desktop-amd64.iso",
    ProxyConfig::default(),
    Optimizer::new(),
    DownloadOptions {
        quiet_mode: false,
        output_path: None, // Uses filename from URL
        verify_iso: true,  // Verify SHA256 after download
    },
    None,
).unwrap();

Errors

Returns an error if:

• Network connection fails after MAX_RETRIES attempts
• HTTP response indicates an error
• Insufficient disk space
• File cannot be created