OAuthSwift: WordPress OAuth1 returns "No OAuth parameters supplied"

Description:

I’m running OAuth1 against wordpress but receiving 400 error code: “No OAuth parameters supplied”

requestError[Error Domain=NSURLErrorDomain Code=400 "HTTP Status 400: Bad Request, Response: No OAuth parameters supplied" UserInfo={NSErrorFailingURLKey=http://example.us/oauth1/request, NSLocalizedDescription=HTTP Status 400: Bad Request, Response: No OAuth parameters supplied, Response-Headers={
    "Access-Control-Allow-Headers" = Authorization;
    Connection = "keep-alive";
    "Content-Type" = "text/html; charset=UTF-8";
    Date = "Sat, 05 Nov 2016 14:13:54 GMT";
    "Keep-Alive" = "timeout=15";
    Server = nginx;
    "Transfer-Encoding" = Identity;
}, OAuthSwiftError.response=<NSHTTPURLResponse: 0x600000032320> { URL: http://example.us/oauth1/request } { status code: 400, headers {
    "Access-Control-Allow-Headers" = Authorization;
    Connection = "keep-alive";
    "Content-Type" = "text/html; charset=UTF-8";
    Date = "Sat, 05 Nov 2016 14:13:54 GMT";
    "Keep-Alive" = "timeout=15";
    Server = nginx;
    "Transfer-Encoding" = Identity;
} }, OAuthSwiftError.response.data=<4e6f204f 41757468 20706172 616d6574 65727320 73757070 6c696564>, Response-Body=No OAuth parameters supplied}]

Here is the test functions:

class ViewController: OAuthViewController {
    
    // oauth swift object (retain)
    var oauthswift: OAuthSwift?

    lazy var internalWebViewController: WebViewController = {
        let controller = WebViewController()
        controller.view = UIView(frame: UIScreen.main.bounds) // needed if no nib or not loaded from storyboard
        controller.delegate = self
        controller.viewDidLoad() // allow WebViewController to use this ViewController as parent to be presented
        return controller
    }() 
}

extension ViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // init now web view handler
        let _ = internalWebViewController.webView
        
        self.navigationItem.title = "OAuth"
        let tableView: UITableView = UITableView(frame: self.view.bounds, style: .plain)
        tableView.delegate = self
        tableView.dataSource = self
        self.view.addSubview(tableView)
        
        self.doOAuthWordpress()
    }
    
    // MARK: Fitbit
    func doOAuthWordpress(){
        let oauthswift = OAuth1Swift(
            consumerKey:    "xxx", // Hard coded for now
            consumerSecret: "yyy", // Hard coded for now
            requestTokenUrl: "http://example.us/oauth1/request",
            authorizeUrl:    "http://example.us/oauth1/authorize",
            accessTokenUrl:  "http://example.us/oauth1/access"
        )
        
        self.oauthswift = oauthswift
        oauthswift.authorizeURLHandler = getURLHandler()
        
        let _ = oauthswift.authorize(
            withCallbackURL: URL(string: "oauth-swift://oauth-callback/wordpress")!,
            success: { credential, response, parameters in
                self.showTokenAlert(name: "WPTesting", credential: credential)
            },
            failure: { error in
                print(error.description)
            }
        )
    }
    
    // MARK: handler
    
    func getURLHandler() -> OAuthSwiftURLHandlerType {
        if internalWebViewController.parent == nil {
            self.addChildViewController(internalWebViewController)
        }
        return internalWebViewController
    }
    
    func showTokenAlert(name: String?, credential: OAuthSwiftCredential) {
        var message = "oauth_token:\(credential.oauthToken)"
        if !credential.oauthTokenSecret.isEmpty {
            message += "\n\noauth_toke_secret:\(credential.oauthTokenSecret)"
        }
        self.showAlertView(title: name ?? "Service", message: message)
        
    }
    
    func showAlertView(title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
    
}

OAuth Provider (WordPress):

WP REST API - OAuth 1.0a Server

OAuth Version:

• Version 1
• Version 2

OS (Please fill the version) :

• iOS :
• OSX :
• TVOS :
• WatchOS :

Installation method:

• Carthage
• CocoaPods
• Manually

Library version:

• head
• v1.0.0
• v0.6
• other: (Please fill in the version you are using.)

Xcode version:

• 8.0 (Swift 3.0)

• 8.0 (Swift 2.3)

• 7.3.1

• other: (8.1)

• objective c