An extension that provides async support for URLSession data function on Linux. See: https://medium.com/hoursofoperation/use-async-urlsession-with-server-side-swift-67821a64fa91?sk=bc142f8d3b6a444253eea660646aa822

URLSession+async.swift

import Foundation
#if canImport(FoundationNetworking)
import FoundationNetworking
#endif

/// Defines the possible errors
public enum URLSessionAsyncErrors: Error {
	case invalidUrlResponse, missingResponseData
}

/// An extension that provides async support for fetching a URL
///
/// Needed because the Linux version of Swift does not support async URLSession yet.
public extension URLSession {
	
	/// A reimplementation of `URLSession.shared.data(from: url)` required for Linux
	///
	/// - Parameter url: The URL for which to load data.
	/// - Returns: Data and response.
	///
	/// - Usage:
	///
	///     let (data, response) = try await URLSession.shared.asyncData(from: url)
	func asyncData(from url: URL) async throws -> (Data, URLResponse) {
		return try await withCheckedThrowingContinuation { continuation in
			let task = dataTask(with: url) { data, response, error in
				if let error = error {
					continuation.resume(throwing: error)
					return
				}
				guard let response = response as? HTTPURLResponse else {
					continuation.resume(throwing: URLSessionAsyncErrors.invalidUrlResponse)
					return
				}
				guard let data = data else {
					continuation.resume(throwing: URLSessionAsyncErrors.missingResponseData)
					return
				}
				continuation.resume(returning: (data, response))
			}
			task.resume()
		}
	}
	
	/// A reimplementation of `URLSession.shared.data(for: request)` required for Linux
	///
	/// - Parameter request: The URLRequest for which to load data.
	/// - Returns: Data and response.
	///
	/// - Usage:
	///
	///     let (data, response) = try await URLSession.shared.asyncData(for: request)
	func asyncData(for request: URLRequest) async throws -> (Data, URLResponse) {
		return try await withCheckedThrowingContinuation { continuation in
			let task = dataTask(with: request) { data, response, error in
				if let error = error {
					continuation.resume(throwing: error)
					return
				}
				guard let response = response as? HTTPURLResponse else {
					continuation.resume(throwing: URLSessionAsyncErrors.invalidUrlResponse)
					return
				}
				guard let data = data else {
					continuation.resume(throwing: URLSessionAsyncErrors.missingResponseData)
					return
				}
				continuation.resume(returning: (data, response))
			}
			task.resume()
		}
	}
}

I have updated to support URLRequest as well as URLs. Also calling dataTask on the session itself, not the global shared one as you may have multiple.