The HTTP POST method is used to send data to a server to create or update a resource. Unlike GET requests, which only retrieve data, POST requests submit data to be processed by the server. This can include creating new records, updating existing ones, or triggering some action. For instance, when you submit a form on a website (such as a login or registration form), you are typically using a POST request. The data sent in a POST request is included in the body of the request, and the server processes this data, often resulting in the creation of a new resource or an update to an existing one. POST requests are not idempotent, meaning that multiple identical POST requests can result in multiple instances of the resource being created or modified.

Endpoint Struct

struct Endpoint
{
    static let registerUser = "<https://api-dev-scus-demo.azurewebsites.net/api/User/RegisterUser>"
    static let getUser = "<https://api-dev-scus-demo.azurewebsites.net/api/User/GetUser>"
}

• Purpose: This struct holds static constants representing the URLs for different API endpoints.
• registerUser: The URL for registering a new user.
• getUser: The URL for retrieving user data.

User Struct

This struct contains methods for interacting with the API endpoints defined in the Endpoint struct.

registerUser Method

func registerUser()
{
    // Setting the URLRequest with the register user endpoint
    var urlRequest = URLRequest(url: URL(string: Endpoint.registerUser)!)
    // Setting the HTTP method to POST as we are sending data to the server
    urlRequest.httpMethod = "post"
    // Data dictionary containing user details to be sent in the request body
    let dataDictionary = ["name":"zeeshan", "email":"[email protected]","password":"1234"]

    // Using do-catch for error handling when converting the data dictionary to JSON
    do {
        // Converting the data dictionary to JSON format
        let requestBody = try JSONSerialization.data(withJSONObject: dataDictionary, options: .prettyPrinted)

        // Setting the HTTP body of the request
        urlRequest.httpBody = requestBody
        // Adding the content-type header field to specify JSON data
        urlRequest.addValue("application/json", forHTTPHeaderField: "content-type")

    } catch let error {
        // Handling any errors that occur during JSON serialization
        debugPrint(error.localizedDescription)
    }

    // Creating a data task to perform the network request
    URLSession.shared.dataTask(with: urlRequest) { (data, httpUrlResponse, error) in
        if(data != nil && data?.count != 0)
        {
            // Parsing the JSON response received from the server
            let response = String(data: data!, encoding: .utf8)
            print("This is the post data")
            debugPrint(response!)
        }
    }.resume()
}

• URLRequest Setup: Constructs a URLRequest object using the registration URL from the Endpoint struct.
• HTTP Method: Sets the HTTP method to "POST", indicating that data is being sent to the server.
• Request Body: Converts a dictionary of user details into JSON format and assigns it as the HTTP body of the request.
• Header Field: Adds the "Content-Type: application/json" header to indicate that the body of the request contains JSON data.
• Network Request: Creates a URLSession data task to perform the network request asynchronously. When data is received, it is converted to a string and printed.

GetUserFromServer Method

func GetUserFromServer()
{
    // Setting the URLRequest with the get user endpoint
    var urlRequest = URLRequest(url: URL(string: Endpoint.getUser)!)
    // Setting the HTTP method to GET as we are retrieving data from the server
    urlRequest.httpMethod = "get"

    // Creating a data task to perform the network request
    URLSession.shared.dataTask(with: urlRequest) { (data, httpUrlResponse, error) in
        if(data != nil && data?.count != 0)
        {
            // Parsing the JSON response received from the server
            let response = String(data: data!, encoding: .utf8)
            print()
            print("This is the get data")
            debugPrint(response!)
        }
    }.resume()
}

• URLRequest Setup: Constructs a URLRequest object using the URL for fetching user data from the Endpointstruct.
• HTTP Method: Sets the HTTP method to "GET", indicating that data is being retrieved from the server.