import { Transport, Serializer, Message } from "multi-rpc-common";
export declare class HTTPError extends Error {
    status: Number;
    body?: any;
    constructor(status: Number, body?: any);
}
export declare class NoUrlPresent extends Error {
    constructor();
}
/**
 * A client-side transport that uses HTTP as its protocol.
 */
export default class HTTPClientTransport extends Transport {
    protected serializer: Serializer;
    protected url?: string;
    headers: Map<string, string>;
    /**
     * Creates a HTTP transport that connects to a server at a specified url.
     * @param serializer - The serializer to use for encoding/decoding messages.
     * @param url - Url of the server to connect to (e.g. "http://localhost").
     */
    constructor(serializer: Serializer, url?: string, headers?: Map<string, string>);
    /**
     * Sends a message to the server, connecting to the server if a connection has not been made.
     * @param message - Message to send.
     * @async
     * @throws {NoUrlPresent} - If url is not present.
     * @throws {HTTPError} - If an HTTP error occurs.
     */
    send(message: Message): Promise<void>;
}