export declare class Constants {
    readonly TUNNEL_MAGIC: number;
    readonly TUNNEL_VERSION: number;
    readonly DEFAULT_TIMEOUT: number;
    readonly MAX_HEADER_SIZE: number;
    readonly MAX_BODY_SIZE: number;
    readonly MAX_RETRIES: number;
    readonly MAX_REDIRECTS: number;
    readonly DEFAULT_CHUNK_SIZE: number;
    readonly DEFAULT_POOL_SIZE: number;
    readonly DEFAULT_CACHE_SIZE: number;
    readonly DEFAULT_TTL: number;
    readonly HTTP_VERSION: string;
    readonly HTTP2_VERSION: string;
    readonly HTTP3_VERSION: string;
    readonly QUIC_VERSION: string;
    readonly USER_AGENT: string;
    readonly CONTENT_TYPE_JSON: string;
    readonly CONTENT_TYPE_FORM: string;
    readonly CONTENT_TYPE_MULTIPART: string;
    readonly CONTENT_TYPE_OCTET: string;
    readonly ACCEPT_ALL: string;
    readonly ACCEPT_ENCODING: string;
    readonly ACCEPT_LANGUAGE: string;
    readonly CONNECTION_KEEP_ALIVE: string;
    readonly CONNECTION_CLOSE: string;
    readonly CACHE_CONTROL_NO_CACHE: string;
    readonly CACHE_CONTROL_NO_STORE: string;
    readonly CACHE_CONTROL_MAX_AGE: string;
}
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