import { HeadersProvider } from '../auth';
/**
 * Error thrown when an HTTP request to the MLflow backend returns a non-2xx response.
 * Carries the parsed status code and (when present) the `error_code` field from the
 * response body so callers can branch on status without matching error messages.
 */
export declare class MlflowHttpError extends Error {
    readonly status: number;
    readonly statusText: string;
    readonly body: string;
    readonly errorCode?: string;
    constructor(status: number, statusText: string, body: string);
    private static formatMessage;
    private static extractErrorCode;
}
/**
 * Make a request to the given URL with the given method, headers, body, and timeout.
 *
 * TODO: add retry logic for transient errors
 */
export declare function makeRequest<T>(method: string, url: string, headerProvider: HeadersProvider, body?: any, timeout?: number): Promise<T>;
/**
 * Send a raw (already-serialized) body — e.g. OTLP protobuf bytes — to `url`.
 * `extraHeaders` merge over the auth headers (to override `Content-Type` etc).
 * The response body is ignored; non-2xx throws {@link MlflowHttpError} so
 * callers can branch on `status` (e.g. 501 capability gating).
 */
export declare function makeRawRequest(method: string, url: string, headerProvider: HeadersProvider, body: BodyInit, extraHeaders?: Record<string, string>, timeout?: number): Promise<void>;