Swift:
Sending an HTTP request

import Foundation

// URL of the resource you're requesting
if let url = URL(string: "https://api.example.com/data") {

    // Create a URLSessionDataTask
    let task = URLSession.shared.dataTask(with: url) { data, response, error in
        
        // Check if there's an error
        if let error = error {
            print("Error fetching data: \(error)")
            return
        }
        
        // Check if we got a valid response and data
        if let httpResponse = response as? HTTPURLResponse, 
           httpResponse.statusCode == 200,
           let data = data {
            
            // Convert data to string and print
            let dataString = String(decoding: data, as: UTF8.self)
            print(dataString)
        }
    }
    // Start the task
    task.resume()
}

// Sample output would be the content fetched from the API.

import Foundation
import CoreFoundation

// Your API endpoint
if let url = URL(string: "https://api.example.com/submit") {

    // Prepare the data you want to send
    let dictionary = ["key": "value"]
    guard let jsonData = try? JSONSerialization.data(withJSONObject: dictionary) else {
        print("Error: Cannot create JSON from dictionary")
        return
    }
    
    // Prepare URLRequest
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.httpBody = jsonData
    
    // Create and start the task
    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        // Handle response here
    }
    task.resume()
}

// Output depends on the response from the server. No standard output.