1Password, 있는 그대로

    /// A `chrome-extension://` address from outside — a desktop app pairing
    /// its extension opens the extension's own page by this address
    /// (1Password's Add browser), the way Chrome does — becomes the
    /// installed package's page URL in WebKit's scheme. Nil when the
    /// address belongs to no installed extension.
    public func pageURL(for url: URL) -> URL? {
        guard url.scheme == "chrome-extension",
              let id = url.host,
              let context = contexts[id]
        else { return nil }
        let base = context.baseURL
        let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
        let path = components?.path ?? ""
        let page = path.isEmpty ? base : base.appendingPathComponent(String(path.dropFirst()))
        guard var pageComponents = URLComponents(url: page, resolvingAgainstBaseURL: false) else { return nil }
        pageComponents.query = components?.query
        // Extension apps route inside the fragment (for example 1Password's
        // #/page/welcome). Preserve its encoding and its own query verbatim.
        pageComponents.percentEncodedFragment = components?.percentEncodedFragment
        return pageComponents.url
    }

        let base = "chrome-extension://\(Self.extensionID)/route.html?from=app"
        // Preserve absent, empty and encoded fragments, including a route's own query.
        for suffix in ["", "#", "#/page/welcome?language=en", "#/page/welcome?label=a%20b%23c%26d"] {
            let input = try #require(URL(string: base + suffix))
            let mapped = try #require(host.pageURL(for: input))
            let original = try #require(URLComponents(url: input, resolvingAgainstBaseURL: false))
            let result = try #require(URLComponents(url: mapped, resolvingAgainstBaseURL: false))
            #expect(result.scheme == "webkit-extension")
            #expect(result.path == "/route.html")
            #expect(result.query == "from=app")
            #expect(result.percentEncodedFragment == original.percentEncodedFragment)
        }
        let input = try #require(URL(string: base + "#/page/welcome?language=en"))
        let mapped = try #require(host.pageURL(for: input))
        let page = try #require(engine.makePage(forExtensionPageAt: mapped))
        page.load(mapped)
        #expect(await eventually { page.status.title == "Fixture welcome" })