How to Implement Connection Pooling for Network Clients

Implement connection pooling by configuring a ConnectorConfig with a limit and passing it to ConnectionPool::new to manage concurrent connections via a tokio::sync::Semaphore. This setup reuses idle connections keyed by authority and enforces a maximum number of in-flight requests.

use actix_web::awc::client::pool::ConnectionPool;
use actix_web::awc::client::config::ConnectorConfig;
use actix_web::awc::Connect;

let config = ConnectorConfig {
    limit: 10,
    // other config fields...
};

let pool = ConnectionPool::new(connector, config);

Connection pooling is like a waiting room for network connections. Instead of creating a new connection for every request, which is slow, you keep a fixed number of connections ready to use. When a request finishes, the connection goes back into the pool for the next person to grab, saving time and resources.