import Vulcan

// Single downloading
imageView.vl.setImage(url: URL(string: "/path/to/image")!)

// Multi downloading
// This image will be overridden by the image of higher priority URL.
imageView.vl.setImage(urls: [
    .url(URL(string: "/path/to/image")!, priority: 100),
    .url(URL(string: "/path/to/image")!, priority: 1000)
    ])

import Vulcan
import SwiftWebP // Only installed via Carthage

extension WebPDecoder: ImageDecoder {
    public func decode(data: Data, response: HTTPURLResponse, options: ImageDecodeOptions?) throws -> Image {
        let contentTypes = response.allHeaderFields.filter({ ($0.key as? String ?? "").lowercased() == "content-type" })
        guard
            let contentType = contentTypes.first,
            let value = contentType.value as? String,
            value == "image/webp",
            let image = WebPDecoder.decode(data) else {
                return try DefaultImageDecoder().decode(data: data, response: response, options: options)
        }
        return image
    }
}

// Set decoder to shared ImageDownloader
Vulcan.defaultImageDownloader.decoder = WebPDecoder()

// Request image with URL
imageView.vl.setImage(url: URL(string: "/path/to/image")!)