src/vs/platform/url/common/urlIpc.ts/URLHandlerChannel/call
class URLHandlerChannel:	call(_: unknown, command: string, arg?: any): Promise<any> {
		switch (command) {
			case 'handleURL': return this.handler.handleURL(URI.revive(arg[0]), arg[1]);
		}

		throw new Error(`Call not found: ${command}`);
	}