🚀 New: SwiftNIO-Based HTTP Client Support (async-http-client)

[dayaffe]

We’ve added first-class support for a SwiftNIO-powered HTTP client using async-http-client. This gives you an alternative client that offers tighter event-loop integration, high-performance networking, and fine-grained control when working in NIO-based applications and services. If your application runs on Vapor, Hummingbird, or other server-side Swift services consider switching to the new engine for a more consistent runtime model.

How to Enable It

You can now configure any AWS service client to use the new NIO HTTP engine:

import AsyncHTTPClient
import AWSClientRuntime
import ClientRuntime
import STSClient

let nioClient = NIOHTTPClient(
    httpClientConfiguration: HttpClientConfiguration()
)

let config = try await STSClient.STSClientConfiguration(
    region: "us-west-2",
    httpClientEngine: nioClient
)

let sts = STSClient(config: config)

Example reusing an event loop group with Vapor:

import Vapor
import SmithySwiftNIO
import AWSClientRuntime

// In your Vapor application configuration
func configure(_ app: Application) throws {
    // Create SwiftNIOHTTPClient with Vapor's EventLoopGroup
    let httpClient = SwiftNIOHTTPClient(
        eventLoopGroup: app.eventLoopGroup
    )
    
    // Configure your AWS client with the shared HTTP client
    let config = try await IdentitystoreClient.IdentitystoreClientConfiguration(
        region: "us-east-1",
        httpClientEngine: httpClient
    )
    
    let identityStoreClient = IdentitystoreClient(config: config)
    
    // Store client in app storage for reuse
    app.storage[IdentityStoreClientKey.self] = identityStoreClient
}

Try it out and let us know how it performs in your workloads!