/**
 * Copyright 2022, 2024 Optimizely
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { AbortableRequest, Headers, RequestHandler } from './http';
import { LoggerFacade } from '../../logging/logger';
import { Platform } from '../../platform_support';
/**
 * Handles sending requests and receiving responses over HTTP via XMLHttpRequest
 */
export declare class BrowserRequestHandler implements RequestHandler {
    private logger?;
    private timeout;
    constructor(opt?: {
        logger?: LoggerFacade;
        timeout?: number;
    });
    /**
     * Builds an XMLHttpRequest
     * @param requestUrl Fully-qualified URL to which to send the request
     * @param headers List of headers to include in the request
     * @param method HTTP method to use
     * @param data?? stringified version of data to POST, PUT, etc
     * @returns AbortableRequest contains both the response Promise and capability to abort()
     */
    makeRequest(requestUrl: string, headers: Headers, method: string, data?: string): AbortableRequest;
    /**
     * Sets the header collection for an XHR
     * @param headers Headers to set
     * @param request Request into which headers are to be set
     * @private
     */
    private setHeadersInXhr;
    /**
     * Parses headers from an XHR
     * @param request Request containing headers to be retrieved
     * @private
     * @returns List of headers without duplicates
     */
    private parseHeadersFromXhr;
}
export declare const __platforms: Platform[];