add invalid response error case

Sources/Enums/RequestError.swift

@@ -20,10 +20,13 @@
 //  THE SOFTWARE.
 //
 
+import Alamofire
+
 public enum RequestError: Error {
 
     case noConnection // no connection to the server
     case network(error: Error)
+    case invalidResponse(error: AFError)
     case mapping(error: Error, response: Any)
 
 }

Sources/Extensions/Alamofire/AlamofireRequest+Extensions.swift

@@ -106,7 +106,14 @@ public extension Reactive where Base: DataRequest {
                     case .notConnectedToInternet, .timedOut:
                         throw RequestError.noConnection
                     default:
-                        throw RequestError.network(error: $0)
+                        throw RequestError.network(error: urlError)
+                    }
+                case let afError as AFError:
+                    switch afError {
+                    case .responseSerializationFailed, .responseValidationFailed:
+                        throw RequestError.invalidResponse(error: afError)
+                    default:
+                        throw RequestError.network(error: afError)
                     }
                 default:
                     throw RequestError.network(error: $0)