Swift API call with URLSession gives 504 error

Question

I have an API call with oauth which I tested with correct authorization token in postman.I am getting proper response in postman. But when I try same thing in Swift, I get 504 error.

I have checked every params and headers properly and everything looks same as postman. Not sure why samething is working in postman and gives 504 error in swift. what could be issue?

var params = [String : String]()
params["Id"] = Id;

var headers = [String : String]()
headers["api-key"] = "XXXXXX"
headers["Authorization"] = "Bearer XXX" 

do{
    var request = URLRequest(url: URL(string: getURL())!)
    request.allHTTPHeaderFields = headers
    request.httpBody = try JSONSerialization.data(withJSONObject: params , options: [])
    request.httpMethod = "GET"
    let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
        let httpResponse = response as! HTTPURLResponse
        print(httpResponse)
    }
    task.resume()
}catch{
}

did u try to test the api using postman first , by passing exactly the same paylaod , if it working ? — Shobhakar Tiwari, Jan 23 '19 at 16:27
If it works with POSTMAN, did you know that it can generate Swift Code? It's not always "good" code, you can try it (and if it works), and then it might help you spot the differences in your parameters, headers, etc. — Larme, Jan 23 '19 at 16:41

score 0 · Accepted Answer · answered Jan 23 '19 at 16:44

When using a GET request, there is no body to the request. Everything goes on the URL.

Also are you sure that in Postman you are using only those 2 headers?

See if something like this works for you:

var params: Parameters = Parameters()
params.updateValue(Id, forKey: "Id")

var components = URLComponents(string: getURL())!
components.queryItems = params.map { (key, value) in
    URLQueryItem(name: key, value: value)
}
components.percentEncodedQuery = components.percentEncodedQuery?.replacingOccurrences(of: "+", with: "%2B")
let request = URLRequest(url: components.url!)
request.setValue("XXXXXX", forHTTPHeaderField: "api-key")
request.setValue("Bearer XXX", forHTTPHeaderField: "Authorization")
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: request) { data, response, error in
    guard let data = data, error == nil else {                                                 // check for fundamental networking error
        print("error=\(error)")
        return
    }

    if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
        print("statusCode should be 200, but is \(httpStatus.statusCode)")
        print("response = \(response)")
    }

    let responseString = String(data: data, encoding: .utf8)
    print("responseString = \(responseString)")
}
task.resume()

Swift API call with URLSession gives 504 error

1 Answers1