HTTP Requests in Swift

POST Request

func makePostRequest(userId: String, message: String) async {
    guard let url=URL(string: "https://example.com/api/log-message") else { return }
    let bodyAsDictionary=[
        "userId": userId,
        "message": message,
    ] as [String: Any]

    guard let bodyAsJson=try? JSONSerialization.data(withJSONObject: bodyAsDictionary, options: []) else { return }

    var request=URLRequest(url: url)
    request.httpMethod="POST"
    request.httpBody=bodyAsJson
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    URLSession.shared.dataTask(with: request) { data, response, error in
        if let error {
            print("Error logging search", error)
        } else {
            print("Logged search")
        }
    }.resume()
}

GET Request

final class InstitutionsListViewModel: ObservableObject {
    @Published var institutionsList: InstitutionsList?
    
    init() {}
    
    func fetchInstitutionsList() {
        guard let url=URL(string: "https://example.com/api/get-data") else {
            print(FetchingDataError.invalidResponse)
            return
        }
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard let data = data else {
                print(FetchingDataError.invalidResponse)
                return
            }
            guard let response=response as? HTTPURLResponse, response.statusCode==200 else { print(FetchingDataError.invalidResponse)
                return
            }
            do {
                let newInstitutionsList=try JSONDecoder().decode(InstitutionsListAPIResponse.self, from: data)
                if newInstitutionsList.status != "success" {
                    print("Status was not 'success' when fetching institution list. Status:", newInstitutionsList.status)
                    return
                }
                // print("Institution list", newInstitutionsList)
                DispatchQueue.main.async {
                    self.institutionsList = newInstitutionsList.data
                }
            } catch {
                print(FetchingDataError.problemParsingResponse)
                return
            }
        }.resume()
    }
}

enum FetchingDataError: Error {
    case invalidUrl
    case invalidResponse
    case problemParsingResponse
}