/**
 * `Accept` handling shared by the legacy (SDK 1.x) and modern (SDK 2.x) HTTP paths.
 *
 * Both SDKs reject a 2025-era POST with 406 unless `Accept` lists both
 * `application/json` and `text/event-stream`. Clients such as curl, Postman and
 * some connectors send only `application/json`, a wildcard, or nothing. Those
 * requests are served in JSON response mode, and the header is rewritten to the
 * value below only so that the SDK's check passes.
 */
/** The `Accept` value both SDK transports require on a POST. */
export declare const SDK_POST_ACCEPT = "application/json, text/event-stream";
/** Logs requests that do not accept SSE, and every 406, when set to a non-empty value. */
export declare const ACCEPT_DEBUG_ENV_VAR = "NITRO_DEBUG_ACCEPT";
export declare function acceptsEventStream(accept: string | null | undefined): boolean;
export interface AcceptDebugEntry {
    engine: 'legacy' | 'modern';
    httpMethod: string;
    accept: string | null | undefined;
    contentType: string | null | undefined;
    protocolVersion: string | null | undefined;
    rpcMethod: string | undefined;
    status: number;
    servedAsJson: boolean;
}
/**
 * Temporary diagnostics for clients whose `Accept` header the SDK rejects.
 * Written to stderr so stdio deployments are unaffected.
 */
export declare function logAcceptDebug(entry: AcceptDebugEntry): void;
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