Function make_http_request 

pub async fn make_http_request<B: Serialize>(
    client: &Client,
    rate_limiter: &RateLimiter,
    method: Method,
    url: &str,
    headers: Vec<(&str, &str)>,
    body: &Option<B>,
    retry_config: RetryConfig,
) -> Result<Response, AppError>

Makes an HTTP request with automatic rate limiting and retry on rate limit errors

This function provides a centralized way to make HTTP requests to the IG Markets API with built-in rate limiting and automatic retry logic.

Arguments

• client - The HTTP client to use for the request
• rate_limiter - Shared rate limiter (borrowed) to pace the request
• method - HTTP method (GET, POST, PUT, DELETE, etc.)
• url - Full URL to request
• headers - Vector of (header_name, header_value) tuples
• body - Optional request body (will be serialized to JSON)
• retry_config - Retry configuration (max retries and delay)

Returns

• Ok(Response) - Successful HTTP response
• Err(AppError) - Error if request fails (excluding rate limit errors which are retried)

Retry is always finite: transient failures (429, 5xx, and IG allowance rate limits) are retried with exponential backoff up to retry_config.max_retries(); everything else fails fast. The 401 token-refresh path is handled by the caller, not here.

Example

use ig_client::application::http::make_http_request;
use ig_client::model::retry::RetryConfig;
use reqwest::{Client, Method};

let client = Client::new();
let rate_limiter = RateLimiter::new(&config);
let headers = vec![
    ("X-IG-API-KEY", "your-api-key"),
    ("Content-Type", "application/json"),
];

// Finite defaults (DEFAULT_MAX_RETRIES retries, exponential backoff)
let response = make_http_request(
    &client,
    &rate_limiter,
    Method::GET,
    "https://demo-api.ig.com/gateway/deal/markets/EPIC",
    headers.clone(),
    &None::<()>,
    RetryConfig::default(),
).await?;

// Maximum 3 retries with a 5 second base delay
let response = make_http_request(
    &client,
    &rate_limiter,
    Method::GET,
    "https://demo-api.ig.com/gateway/deal/markets/EPIC",
    headers,
    &None::<()>,
    RetryConfig::with_max_retries_and_delay(3, 5),
).await?;