Parse to json only in the case of a successful response

Author: Catalina Turlea

Sources/Flows/OAuth2.swift

@@ -364,19 +364,20 @@ open class OAuth2: OAuth2Base {
 
 			perform(request: post) { response in
 				do {
-					let data = try response.responseData()
-					let json = try self.parseRefreshTokenResponseData(data)
 					let statusCode = response.response.statusCode
 					switch statusCode {
 					case 400..<500:
 						throw OAuth2Error.clientErrorWithStatus(statusCode)
 					case 500...599:
 						throw OAuth2Error.serverErrorWithStatus(statusCode)
+					case 200..<300:
+						let data = try response.responseData()
+						let json = try self.parseRefreshTokenResponseData(data)
+						self.logger?.debug("OAuth2", msg: "Did use refresh token for access token [\(nil != self.clientConfig.accessToken)]")
+						callback(json, nil)
 					default:
 						throw OAuth2Error.generic("Failed with status \(response.response.statusCode)")
 					}
-					self.logger?.debug("OAuth2", msg: "Did use refresh token for access token [\(nil != self.clientConfig.accessToken)]")
-					callback(json, nil)
 				}
 				catch let error {
 					self.logger?.debug("OAuth2", msg: "Error refreshing access token: \(error)")