/**
 * @module HttpUtils
 * @description Utility functions for HTTP communication with A2A protocol servers
 */
import { JsonRpcRequest, JsonRpcResponse } from '@dexwox-labs/a2a-core';
import { MessageClientOptions } from '../types';
/**
 * Authentication options for HTTP requests
 *
 * This interface defines how authentication should be handled for HTTP requests,
 * supporting various authentication methods including basic auth, bearer tokens,
 * API keys, and custom headers.
 *
 * @example
 * ```typescript
 * // Basic authentication
 * const basicAuth: AuthOptions = {
 *   type: 'basic',
 *   credentials: {
 *     username: 'user',
 *     password: 'pass'
 *   }
 * };
 *
 * // Bearer token authentication
 * const tokenAuth: AuthOptions = {
 *   type: 'bearer',
 *   credentials: {
 *     token: 'your-jwt-token'
 *   }
 * };
 * ```
 */
export interface AuthOptions {
    /** Authentication type to use */
    type: 'basic' | 'bearer' | 'apiKey' | 'custom';
    /** Credentials for the selected authentication type */
    credentials: {
        /** Username for basic authentication */
        username?: string;
        /** Password for basic authentication */
        password?: string;
        /** Token for bearer authentication */
        token?: string;
        /** API key for apiKey authentication */
        apiKey?: string;
        /** Custom header name for custom authentication */
        headerName?: string;
        /** Custom header value for custom authentication */
        headerValue?: string;
    };
}
/**
 * Sends a JSON-RPC request to an A2A protocol server
 *
 * This function handles the details of making authenticated HTTP requests
 * to A2A protocol servers, including setting up the proper headers,
 * handling authentication, and processing the response.
 *
 * @param options - Client options including base URL, headers, timeout, and authentication
 * @param request - JSON-RPC request object to send
 * @returns Promise resolving to the JSON-RPC response
 * @throws Error if the HTTP request fails or times out
 *
 * @example
 * ```typescript
 * // Send a simple JSON-RPC request
 * const response = await sendRequest<AgentCard[]>(
 *   {
 *     baseUrl: 'https://a2a-server.example.com',
 *     timeout: 5000,
 *     auth: {
 *       type: 'bearer',
 *       credentials: { token: 'your-token' }
 *     }
 *   },
 *   {
 *     jsonrpc: '2.0',
 *     method: 'discover',
 *     params: { capability: 'chat' },
 *     id: '1'
 *   }
 * );
 *
 * console.log('Response:', response.result);
 * ```
 */
export declare function sendRequest<T = unknown>(options: MessageClientOptions & {
    auth?: AuthOptions;
}, request: JsonRpcRequest): Promise<JsonRpcResponse<T>>;
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