I am trying to reach a site that should take the username and password given and return a JSON which contains information stating whether or not the login data provided was valid or not.
However, all I'm getting back is the site's HTML code instead of a response. I've tried the request with the same parameters on https://www.hurl.it/ and have gotten the correct response so that does not seem to be the issue.
I use the following code:
private func uploadToAPI(username: String, password: String) {
guard let url = URL(string: "http://api.foo.com/login.php"),
let encodedUsername = username.addingPercentEncoding(withAllowedCharacters: CharacterSet.alphanumerics),
let encodedPassword = password.addingPercentEncoding(withAllowedCharacters: CharacterSet.alphanumerics) else {
self.loginButton.isLoading = false
return
}
let httpBodyParameters = ["user": encodedUsername, "password": encodedPassword, "client": "ios", "version": "5"]
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = try? JSONSerialization.data(withJSONObject: httpBodyParameters, options: JSONSerialization.WritingOptions.prettyPrinted)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
URLSession.shared.dataTask(with: request) { (data, response, error) in
if let response = response {
print(response.mimeType) // Prints "text/html"
}
if let data = data {
print(try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments)) // Prints nil
print(String(data: data, encoding: String.Encoding.utf8)) // Prints the site's HTML
}
}.resume()
}
I fail to see where the issue is. I've also tried not setting the HTTP headers but that makes no difference. Anyone got any ideas?
It seems like not setting the HTTP header fields and using a string literal instead of a Dictionary as HTTP body data did it for me.
For anyone interested this is the code that now receives the expected response:
guard let url = URL(string: "http://api.foo.com/login.php?"),
let encodedUsername = username.addingPercentEncoding(withAllowedCharacters: CharacterSet.alphanumerics),
let encodedPassword = password.addingPercentEncoding(withAllowedCharacters: CharacterSet.alphanumerics) else {
if let delegate = self.delegate {
delegate.viewModelDidRejectLogin(self)
}
return
}
let httpBodyString = "user=\(encodedUsername)&password=\(encodedPassword)&client=ios&version=5"
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = httpBodyString.data(using: String.Encoding.utf8)
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data = data, error == nil else {
print(error)
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [String : AnyObject] {
self.readLoginResponse(json)
}
} catch {
print(error)
}
}.resume()
I've made a little App in Swift where a user can search the Spotify database for songs. I am using the Web API Console > Search for an Item. My problem is the new OAuth system where you have to sign-in and all that stuff. My authorization is ok, but when I'm trying to get an access token with the following code, it's returning me the following error: {"error":"server_error","error_description":"Unexpected status: 400"}. My code is:
let keys = "<MY_APPLICATION_KEYS>"
let url = NSURL(string: "https://accounts.spotify.com/api/token")
let session = URLSession.shared
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
request.setValue("Basic \(keys)", forHTTPHeaderField: "Authorization")
request.setValue("client_credentials", forHTTPHeaderField: "grant_type")
let task = session.dataTask(with: request as URLRequest) { (data, response, error) in
guard let _: Data = data, let _: URLResponse = response, error == nil else {
print(error!)
return
}
let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("Data: \(dataString!)")
self.parseData(JSONData: data!)
}
task.resume()
}
var accessToken = ""
func parseData(JSONData : Data) {
do {
var readableJSON = try JSONSerialization.jsonObject(with: JSONData, options: .mutableContainers) as! JSONStandard
if let token = readableJSON["access_token"] as? String {
accessToken = token
}
print("Access Token: \(accessToken)")
updateTokenInFirebase()
}
catch{
print(error)
}
Any help would be very appreciated, thank you very much in advance!
Documentation of the Web API: Web API Link
I am using on the Client Credentials Flow the first method.
I know it's been ~1 year since you posted this but I had the same issue and after a few tries was able to get it. You can test this in Playground.
import Foundation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
if let url = URL(string: "https://accounts.spotify.com/api/token") {
var postRequest = URLRequest(url: url)
postRequest.httpMethod = "POST"
let bodyParams = "grant_type=client_credentials"
postRequest.httpBody = bodyParams.data(using: String.Encoding.ascii, allowLossyConversion: true)
let id = "your client id"
let secret = "your secret"
let combined = "\(id):\(secret)"
let combo = "\(id):\(secret)".toBase64()
postRequest.addValue("Basic \(combo)", forHTTPHeaderField: "Authorization")
let task = URLSession.shared.dataTask(with: postRequest) { (data, response, error) in
guard let data = data else {
return
}
print(String(data: data, encoding: String.Encoding.utf8)!)
}
task.resume()
}
extension String {
func fromBase64() -> String? {
guard let data = Data(base64Encoded: self) else {
return nil
}
return String(data: data, encoding: .utf8)
}
func toBase64() -> String {
return Data(self.utf8).base64EncodedString()
}
}
I know this is really late, but the issue is with this line:
request.setValue("client_credentials", forHTTPHeaderField: "grant_type")
According to the authorization guide, this should be in the body of the request, not the headers.
I made this class below to help make http requests from anywhere in my application, however when i call the class it does not make the request as expected. I see i can print from the function so i know it is making it that far at least. What else do i need to make this request?? the api parameter is being passed correctly as well.
in viewController:
let url = "post/test"
MakeHttpRequest.sharedInstance.postRequest(api: url)
in class:
import Foundation
final class MakeHttpRequest {
static let sharedInstance = MakeHttpRequest()
var api_token = "token_here"
var url_base = "https://test.frb.io/"
func postRequest (api : String) {
let parameters = ["email": "testing123#gmail.com"]
guard let destination = URL(string: url_base + api) else { return }
var request = URLRequest(url: destination)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
// request.setValue("clientIDhere", forHTTPHeaderField: "Authorization")
guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: [])
else { return }
request.httpBody = httpBody
let session = URLSession.shared
session.dataTask(with: request) { (data, response, error) in
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
if (json["response"]) != nil {
}
} catch {
print(error)
}
}
}.resume()
print(url_base + api)
}
private init() {
}
}
So two things to check. Sometimes swift function chaining doesn't work properly. So try splitting the session.dataTask and resume into two statements. And second try adding error handling to the response. You may be getting an error without knowing it. See code sample below.
import Foundation
final class MakeHttpRequest {
static let sharedInstance = MakeHttpRequest()
var api_token = "token_here"
var url_base = "https://test.frb.io/"
func postRequest (api: String, parameters: [String: Any]? = nil) {
guard let destination = URL(string: url_base + api) else { return }
var request = URLRequest(url: destination)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
// request.setValue("clientIDhere", forHTTPHeaderField: "Authorization")
if let parameters = parameters {
guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) else { return
}
request.httpBody = httpBody
}
let session = URLSession.shared
let task = session.dataTask(with: request) { (data, response, error) in
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
if (json["response"]) != nil {
print("1234")
} else {
print("ABCD")
}
} catch {
print(error)
}
} else {
print(error ?? "")
}
}
task.resume()
print(url_base + api)
}
private init() {
}
}
let url = "post/test"
MakeHttpRequest.sharedInstance.postRequest(api: url)
I keep getting a timeout with sending post requests when my actual device is on 3G or 4G. However, when I'm on wifi, the post request is immediately received on the server side.
Here's my code that involves the post request. I'm getting a Optional("The request timed out."). I don't think the session length should be a problem since it times out after a long time and the data that is being sent is just a username with a password. Any thoughts?
I run a flask server, but I don't think it's relevant so I didn't include its code.
if let jsonData = try? JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted) {
let url = NSURL(string: base_address + taglocation_address)!
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = jsonData
print("starting task")
let task = URLSession.shared.dataTask(with: request as URLRequest){ data,response,error in
if error != nil{
self.statusLabel.text = error?.localizedDescription
print(error?.localizedDescription)
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as? NSDictionary
print("doing something")
if let responseJSON = json as? [String: String] {
print(responseJSON)
self.statusLabel.text = responseJSON["status"]
}
} catch let error as NSError {
self.statusLabel.text = error.localizedDescription
print(error)
}
}
task.resume()
}
In your NSMutableURLRequest object, try adding allowsCellularAccess property and set it to true. Refer to my code below.
if let jsonData = try? JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted) {
let url = NSURL(string: base_address + taglocation_address)!
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpBody = jsonData
request.allowsCellularAccess=true //Add this line
print("starting task")
let task = URLSession.shared.dataTask(with: request as URLRequest){ data,response,error in
if error != nil{
self.statusLabel.text = error?.localizedDescription
print(error?.localizedDescription)
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as? NSDictionary
print("doing something")
if let responseJSON = json as? [String: String] {
print(responseJSON)
self.statusLabel.text = responseJSON["status"]
}
} catch let error as NSError {
self.statusLabel.text = error.localizedDescription
print(error)
}
}
task.resume()
}
I adapted this from Ray Wenderlich's iOS Apprentice tutorial part 4.
This code works as a GET request sent to my Strongloop API with a simple database model, however:
This works, but I don't know why it works, since it invokes no method that I can see to actually send the request.
I see no means to make it into a POST request.
My question is: How do I perform a POST request? Is it done in a completely different way?
Let me know if you need more information.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func getFromDB() {
let url = urlWithSearchText("")
println("URL: '\(url)'")
if let jsonString = performGetRequestWithURL(url) {
println("Received JSON string '\(jsonString)'")
}
}
func urlWithSearchText(searchText: String) -> NSURL {
let escapedSearchText = searchText.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
let urlString = String(format: "http://localhost:3000/api/Tests", escapedSearchText)
let url = NSURL(string: urlString)
return url!
}
func performGetRequestWithURL(url: NSURL) -> String? {
var error: NSError?
if let resultString = String(contentsOfURL: url, encoding: NSUTF8StringEncoding, error: &error) {
return resultString
} else if let error = error {
println("Download Error: \(error)")
} else {
println("Unknown Download Error")
}
return nil
}
Here is a picture of this working:
https://dl.dropboxusercontent.com/u/14464971/Images/Messages%20Image%281477993527%29.png
Swift 3 & above
GET
func getRequest() {
// request url
let url = URL(string: "https://jsonplaceholder.typicode.com/todos/1")! // change the url
// create URLSession with default configuration
let session = URLSession.shared
// create dataTask using the session object to send data to the server
let task = session.dataTask(with: url) { data, response, error in
if let error = error {
print("GET Request Error: \(error.localizedDescription)")
return
}
// ensure there is valid response code returned from this HTTP response
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
print("Invalid Response received from the server")
return
}
// ensure there is data returned
guard let responseData = data else {
print("nil Data received from the server")
return
}
do {
// serialise the data object into Dictionary [String : Any]
if let jsonResponse = try JSONSerialization.jsonObject(with: responseData, options: .mutableContainers) as? [String: Any] {
print(jsonResponse)
} else {
print("data maybe corrupted or in wrong format")
throw URLError(.badServerResponse)
}
} catch let error {
print("JSON Parsing Error: \(error.localizedDescription)")
}
}
// resume the task
task.resume()
}
POST
func postRequest() {
// declare the parameter as a dictionary that contains string as key and value combination. considering inputs are valid
let parameters: [String: Any] = ["name": "abc", "password": "password#123"]
// create the url with URL
let url = URL(string: "http://myServerName.com/api")! //change the url
// create the session object
let session = URLSession.shared
// now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
// add headers for the request
request.addValue("application/json", forHTTPHeaderField: "Content-Type") // change as per server requirements
request.addValue("application/json", forHTTPHeaderField: "Accept")
do {
// convert parameters to Data and assign dictionary to httpBody of request
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
return
}
// create dataTask using the session object to send data to the server
let task = session.dataTask(with: request) { data, response, error in
if let error = error {
print("Post Request Error: \(error.localizedDescription)")
return
}
// ensure there is valid response code returned from this HTTP response
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode)
else {
print("Invalid Response received from the server")
return
}
// ensure there is data returned
guard let responseData = data else {
print("nil Data received from the server")
return
}
do {
// create json object from data or use JSONDecoder to convert to Model stuct
if let jsonResponse = try JSONSerialization.jsonObject(with: responseData, options: .mutableContainers) as? [String: Any] {
print(jsonResponse)
// handle json response
} else {
print("data maybe corrupted or in wrong format")
throw URLError(.badServerResponse)
}
} catch let error {
print(error.localizedDescription)
}
}
task.resume()
}
Below are two POST methods. Depending on if you want it synchronous (everything else waits until the post method is completed) or asynchronous (POST method runs in background, other methods run in parallel).
Methods
// POST data to url
func postDataAsynchronous(url: String, bodyData: String, completionHandler: (responseString: String!, error: NSError!) -> ()) {
var URL: NSURL = NSURL(string: url)!
var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
request.HTTPMethod = "POST";
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding);
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()){
response, data, error in
var output: String!
if data != nil {
output = NSString(data: data, encoding: NSUTF8StringEncoding) as! String
}
completionHandler(responseString: output, error: error)
}
}
// Obtain the data
func postDataSynchronous(url: String, bodyData: String, completionHandler: (responseString: String!, error: NSError!) -> ())
{
let URL: NSURL = NSURL(string: url)!
var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
request.HTTPMethod = "POST"
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding);
request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
var response: NSURLResponse?
var error: NSError?
// Send data
let data = NSURLConnection.sendSynchronousRequest(request, returningResponse: &response, error: &error)
var output: String! // Default to nil
if data != nil{
output = NSString(data: data!, encoding: NSUTF8StringEncoding) as! String
}
completionHandler(responseString: output, error: error)
}
Using them
You can then call (use) them like so:
postDataSynchronous(url, bodyData: bodyData) {
responseString, error in
if error != nil {
println("Error during post: \(error)")
return
}
else{
//Success
println(responseString)
userType = responseString // Set usertype based on server response
}
}
SWIFT 2.0
func postData(url: String, params: Dictionary<String, String>, completionHandler: (data: NSData?, response: NSURLResponse?, error: NSError?) -> ()) {
// Indicate download
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
let url = NSURL(string: url)!
// print("URL: \(url)")
let request = NSMutableURLRequest(URL: url)
let session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
// Verify downloading data is allowed
do {
request.HTTPBody = try NSJSONSerialization.dataWithJSONObject(params, options: [])
} catch let error as NSError {
print("Error in request post: \(error)")
request.HTTPBody = nil
} catch {
print("Catch all error: \(error)")
}
// Post the data
let task = session.dataTaskWithRequest(request) { data, response, error in
completionHandler(data: data, response: response, error: error)
// Stop download indication
UIApplication.sharedApplication().networkActivityIndicatorVisible = false // Stop download indication
}
task.resume()
}
guard let url = URL(string: "https://jsonplaceholder.typicode.com/users") else { return }
let session = URLSession.shared
session.dataTask(with: url) { (data, response, error) in
if let response = response {
print(response)
}
if let data = data {
print(data)
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print(json)
} catch {
print(error)
}
}
}.resume()
}
It's a get method.
This method invokes the http request.
String(contentsOfURL: url, encoding: NSUTF8StringEncoding, error: &error)
Because Swift String has no init signature like this.
This method would be written somewhere in the project, as extension of String
It would be something like this
extension String{
init(contentsOfURL: NSURL, encoding: NSUTF8StringEncoding, inout error: NSError){
// load data from url
self = //parse data to string
}
}
The String(contentsOfUrl:encoding:error) initializer makes a GET request under the hood and returns the content as a string with the specified encoding.
One way to make a request would be to create an NSURLConnection and use NSMutablrURLRequest set the HTTP method the post. With the NSMutableURLRequest, you can create a NSURLConnection and start it immediately with a delegate or you can call NSURLConnection.sendSynchronousRequest or NSURLConnection.sendAsynchronousRequest to send the request.
let parameters = ["username": "#Bipin_kumar", "tweet": "HelloWorld"]
guard let url = URL(string: "https://jsonplaceholder.typicode.com/posts") else { return }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) else { return }
request.httpBody = httpBody
let session = URLSession.shared
session.dataTask(with: request) { (data, response, error) in
if let response = response {
print(response)
}
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print(json)
} catch {
print(error)
}
}
}.resume()
It's a post method.
GET Request
func getRequest(with url: URL, callback: #escaping (Any?) -> Swift.Void) -> Void {
let defaultConfigObject = URLSessionConfiguration.default
defaultConfigObject.timeoutIntervalForRequest = 30.0
defaultConfigObject.timeoutIntervalForResource = 60.0
let session = URLSession.init(configuration: defaultConfigObject, delegate: nil, delegateQueue: nil)
var urlRequest = URLRequest(url: url as URL)
urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
urlRequest.httpMethod = "GET"
session.dataTask(with: urlRequest, completionHandler: { (data, response, error) in
guard let httpResponse: HTTPURLResponse = response as? HTTPURLResponse
else {
print("Error: did not receive data")
return
}
var response : (Any)? = nil
if httpResponse.statusCode == 200 {
print(httpResponse)
guard let responseData = data else {
print("Error: did not receive data")
return
}
do {
let responseData = try JSONSerialization.jsonObject(with: responseData, options: [JSONSerialization.ReadingOptions.allowFragments])
response = responseData
callback(response)
}
catch _ as NSError {
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
callback(responseString)
return
}
}
else {
print(httpResponse)
guard error == nil else {
print("error calling GET on /todos/1")
print(error ?? "error")
callback(response!)
return
}
}
}).resume()
}
POST REQUEST
//MARK: post request
func postRequest(with url:URL, postBody:String, callback: #escaping (Any?) -> Void) -> Void {
let defaultConfigObject = URLSessionConfiguration.default
defaultConfigObject.timeoutIntervalForRequest = 30.0
defaultConfigObject.timeoutIntervalForResource = 60.0
let session = URLSession.init(configuration: defaultConfigObject, delegate: nil, delegateQueue: nil)
let params: String! = postBody
var urlRequest = URLRequest(url: url as URL)
urlRequest.httpMethod = "POST"
let data = params.data(using: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
urlRequest.httpBody = data
session.dataTask(with: urlRequest, completionHandler: { (data, urlResponse, error) in
guard let httpResponse:HTTPURLResponse = urlResponse as? HTTPURLResponse
else{
print("did not get any data")
return
}
var response : (Any)? = nil
if httpResponse.statusCode == 200 {
guard let responseData = data else {
print("Error: did not receive data")
return
}
do {
guard let responseData = try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: AnyObject] else {
print("error trying to convert data to JSON")
return
}
response = responseData
callback(response)
} catch _ as NSError {
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
callback(responseString)
return
}
}
else {
guard error == nil else {
print("error calling GET on /todos/1")
print(error ?? "error")
callback(nil)
return
}
}
}).resume()
}
Always try to check the HTTPURLResponse code