Method setHeaders

packages/core/src/core/core.ts:719–732

* Replace the headers sent with every runtime request. * * This is an overwrite, not a merge — the supplied object becomes the * complete header set. Entries whose value is `null` or `undefined` are * dropped, which is how you clear a header (e.g. removing `Authorization` * on logout)

(headers: Record<string, string | null | undefined>)

   * core-level headers.
   */
  setHeaders(headers: Record<string, string | null | undefined>): void {
    this._headers = normalizeHeaders(headers);
    this.agentRegistry.applyHeadersToAgents(
      this.agentRegistry.agents as Record<string, AbstractAgent>,
    );
    void this.notifySubscribers(
      (subscriber) =>
        subscriber.onHeadersChanged?.({
          copilotkit: this,
          headers: this.headers,
        }),
      "Subscriber onHeadersChanged error:",
    );
  }

  setCredentials(credentials: RequestCredentials | undefined): void {
    this._credentials = credentials;