How do I add a body to an HTTP GET request made with Combine in Swift? - swift

Question

I am making an HTTP GET request using Combine and I don't know how to add a body. I know that it is not ok to have a body in a GET request, but I really need to test some things. I am using Xcode 11.4 and iOS 13.4. Stack Overflow doesn’t let me post this question unless i write some more information, but I can’t think of any more pieces of information that you might need for this. Here is my code:
import Foundation
import Combine
//MARK: - Object to retrieve from JSON
struct Doctor: Codable, Identifiable {
let id = UUID()
let patients: [Patients]
}
struct Patients: Codable, Identifiable {
let id: String
let name: String
let phone: String
enum CodingKeys: String, CodingKey {
case id = "_id"
case name
case phone
}
}
class Network {
enum Error: LocalizedError {
case invalidResponse
case addressUnreachable(URL)
var errorDescription: String? {
switch self {
case .invalidResponse:
return "The server responded with garbage."
case .addressUnreachable(let url):
return "\(url.absoluteString) is unreachable."
}
}
}
let urlRequest = URL(string: URL)!
let networkQueue = DispatchQueue(label: "Networking",
qos: .default,
attributes: .concurrent)
func downloadPatients() -> AnyPublisher<Doctor, Error> {
URLSession.shared
.dataTaskPublisher(for: urlRequest)
.receive(on: networkQueue)
.map(\.data)
.decode(type: Doctor.self, decoder: JSONDecoder())
.mapError { (error) -> Network.Error in
switch error {
case is URLError:
return Error.addressUnreachable(self.urlRequest)
default:
return Error.invalidResponse
}
}
.eraseToAnyPublisher()
}
}
let networkRequest = Network()
func loadPatients() {
cancelable = networkRequest.downloadPatients()
.sink(
receiveCompletion: {
receiveValue: { doctor in
self.localPatients = doctor.patients
self.isShowing = false
}
)
}
Thank you!

Answer 1

I'm not sure if can be done with dataTaskPublish for a Get. But You can customize your request with this kind of call:
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.httpBody = body
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
if let error = error {
// Handle the error here
}
guard let data = data else { return }
let resData = try! JSONDecoder().decode(ServerMessage.self, from: data)
}.resume()
}