Class HttpClient

Example: A provider client with auth injection and 429 back-off

private _client: HttpClient | null = null;

protected get httpClient(): HttpClient {
    if (!this._client) {
        this._client = new HttpClient({
            BaseURL: 'https://graph.facebook.com/v18.0',
            Timeout: 30000,
            Headers: { Accept: 'application/json' },

            // Runs before every attempt, so a refreshed token is picked up automatically.
            OnRequest: (config) => ({
                ...config,
                Query: { ...config.Query, access_token: this.getAccessToken() },
            }),

            // Bounded by MaxRetries (default 3).
            OnRetry: async (error) => {
                if (error.Status !== 429) return false;
                await this.handleRateLimit(60);
                return true;
            },
        });
    }
    return this._client;
}

// Then, at the call sites:
const response = await this.httpClient.Get<FacebookPagedResponse<Post>>('/me/feed');
return response.Data.data;
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