src/vs/platform/request/common/requestIpc.ts/RequestChannelClient/request
class RequestChannelClient:	static async request(channel: IChannel, options: IRequestOptions, token: CancellationToken): Promise<IRequestContext> {
		const [res, buffer] = await channel.call<RequestResponse>('request', [options]);
		return { res, stream: bufferToStream(buffer) };
	}