diff --git a/Sources/Apexy/Client.swift b/Sources/Apexy/Client.swift
index 6b19909..f426ec0 100755
--- a/Sources/Apexy/Client.swift
+++ b/Sources/Apexy/Client.swift
@@ -100,19 +100,22 @@ public final class Client {
     ) -> Progress where T: Endpoint {
 
         let anyRequest = AnyRequest(create: endpoint.makeRequest)
-        let request = sessionManager.request(anyRequest).responseData(
-            queue: responseQueue,
-            completionHandler: { (response: DataResponse<Data, AFError>) in
-
-                let result = APIResult<T.Content>(catching: { () throws -> T.Content in
-                    let data = try response.result.get()
-                    return try endpoint.content(from: response.response, with: data)
-                })
-
-                self.completionQueue.async {
-                    self.responseObserver?(response.request, response.response, response.data, result.error)
-                    completionHandler(result)
-                }
+        let request = sessionManager.request(anyRequest)
+            .validate { request, response, data in
+                Result(catching: { try endpoint.validate(request, response: response, data: data) })
+            }.responseData(
+                queue: responseQueue,
+                completionHandler: { (response: DataResponse<Data, AFError>) in
+
+                    let result = APIResult<T.Content>(catching: { () throws -> T.Content in
+                        let data = try response.result.get()
+                        return try endpoint.content(from: response.response, with: data)
+                    })
+
+                    self.completionQueue.async {
+                        self.responseObserver?(response.request, response.response, response.data, result.error)
+                        completionHandler(result)
+                    }
             })
 
         return progress(for: request)
diff --git a/Sources/Apexy/Endpoint.swift b/Sources/Apexy/Endpoint.swift
index 310bb01..7c300a5 100755
--- a/Sources/Apexy/Endpoint.swift
+++ b/Sources/Apexy/Endpoint.swift
@@ -29,4 +29,17 @@ public protocol Endpoint {
     /// - Returns: A new endpoint content.
     /// - Throws: Any error creating content.
     func content(from response: URLResponse?, with body: Data) throws -> Content
+
+    /// Validate response.
+    ///
+    /// - Parameters:
+    ///   - request: The metadata associated with the request.
+    ///   - response: The metadata associated with the response.
+    ///   - data: The response body data.
+    /// - Throws: Any response validation error.
+    func validate(_ request: URLRequest?, response: HTTPURLResponse, data: Data?) throws
+}
+
+public extension Endpoint {
+    func validate(_ request: URLRequest?, response: HTTPURLResponse, data: Data?) { }
 }