diff --git a/PublisherKit.podspec b/PublisherKit.podspec
index 34d6afa..dfd8632 100644
--- a/PublisherKit.podspec
+++ b/PublisherKit.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |spec|
 
   spec.name             = "PublisherKit"
-  spec.version          = "4.0.1"
+  spec.version          = "4.0.2"
   spec.summary          = "An open source implementation of Apple's Combine framework for processing asynchronous events over time"
 
   spec.homepage         = "https://github.com/ragzy15/PublisherKit"
diff --git a/README.md b/README.md
index 3536aa0..e416da6 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ let package = Package(
             targets: ["YourPackage"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/ragzy15/PublisherKit.git", from: "4.0.1"),
+        .package(url: "https://github.com/ragzy15/PublisherKit.git", from: "4.0.2"),
     ],
     targets: [
         .target(
@@ -80,7 +80,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '10.0'
 use_frameworks!
 
-pod 'PublisherKit', '~> 4.0.1'
+pod 'PublisherKit', '~> 4.0.2'
 ```
 
 Then, run the following command:
diff --git a/Sources/PublisherKit/Error/URLError.swift b/Sources/PublisherKit/Error/URLError.swift
index e71bec2..7202414 100644
--- a/Sources/PublisherKit/Error/URLError.swift
+++ b/Sources/PublisherKit/Error/URLError.swift
@@ -20,4 +20,10 @@ extension URLError {
             NSLocalizedDescriptionKey: "Content data received during a connection request had an unknown content encoding."
         ])
     }
+    
+    static func onlyHTTPSupported() -> Error {
+        URLError(.cannotParseResponse, userInfo: [
+            NSLocalizedDescriptionKey: "Currently Validate only works on HTTP requests."
+        ])
+    }
 }
diff --git a/Sources/PublisherKit/Protocols/Publisher/Publisher+Operators.swift b/Sources/PublisherKit/Protocols/Publisher/Publisher+Operators.swift
index 616d79f..469a270 100644
--- a/Sources/PublisherKit/Protocols/Publisher/Publisher+Operators.swift
+++ b/Sources/PublisherKit/Protocols/Publisher/Publisher+Operators.swift
@@ -1260,7 +1260,7 @@ extension Publisher {
 }
 
 // MARK: VALIDATE
-extension Publisher where Output == (data: Data, response: HTTPURLResponse) {
+extension Publisher where Output == (data: Data, response: URLResponse) {
     
     /// Validates that the response has a status code acceptable in the specified range, and that the response has a content type in the specified sequence.
     ///
diff --git a/Sources/PublisherKit/Publishers/URLSession/Data Task.swift b/Sources/PublisherKit/Publishers/URLSession/Data Task.swift
index b6d52d9..080d287 100644
--- a/Sources/PublisherKit/Publishers/URLSession/Data Task.swift	
+++ b/Sources/PublisherKit/Publishers/URLSession/Data Task.swift	
@@ -39,7 +39,7 @@ extension URLSession {
     
     public struct DataTaskPKPublisher: PublisherKit.Publisher {
         
-        public typealias Output = (data: Data, response: HTTPURLResponse)
+        public typealias Output = (data: Data, response: URLResponse)
         
         public typealias Failure = Error
         
@@ -104,7 +104,7 @@ extension URLSession.DataTaskPKPublisher {
             
             if let error = error {
                 downstream.receive(completion: .failure(error))
-            } else if let response = response as? HTTPURLResponse, let data = data {
+            } else if let response = response, let data = data {
                 _ = downstream.receive((data, response))
                 downstream.receive(completion: .finished)
             } else {
diff --git a/Sources/PublisherKit/Publishers/URLSession/Download Task.swift b/Sources/PublisherKit/Publishers/URLSession/Download Task.swift
index 97a6111..801e044 100644
--- a/Sources/PublisherKit/Publishers/URLSession/Download Task.swift	
+++ b/Sources/PublisherKit/Publishers/URLSession/Download Task.swift	
@@ -49,7 +49,7 @@ extension URLSession {
     
     public struct DownloadTaskPKPublisher: PublisherKit.Publisher {
         
-        public typealias Output = (url: URL, response: HTTPURLResponse)
+        public typealias Output = (url: URL, response: URLResponse)
         
         public typealias Failure = Error
         
@@ -129,7 +129,7 @@ extension URLSession.DownloadTaskPKPublisher {
             
             if let error = error {
                 downstream.receive(completion: .failure(error))
-            } else if let url = url, let response = response as? HTTPURLResponse {
+            } else if let url = url, let response = response {
                 _ = downstream.receive((url, response))
                 downstream.receive(completion: .finished)
             } else {
diff --git a/Sources/PublisherKit/Publishers/URLSession/Upload Task.swift b/Sources/PublisherKit/Publishers/URLSession/Upload Task.swift
index 8ced51e..6dcd752 100644
--- a/Sources/PublisherKit/Publishers/URLSession/Upload Task.swift	
+++ b/Sources/PublisherKit/Publishers/URLSession/Upload Task.swift	
@@ -40,7 +40,7 @@ extension URLSession {
     
     public struct UploadTaskPKPublisher: PublisherKit.Publisher {
         
-        public typealias Output = (data: Data, response: HTTPURLResponse)
+        public typealias Output = (data: Data, response: URLResponse)
         
         public typealias Failure = Error
         
@@ -124,7 +124,7 @@ extension URLSession.UploadTaskPKPublisher {
             
             if let error = error {
                 downstream.receive(completion: .failure(error))
-            } else if let response = response as? HTTPURLResponse, let data = data {
+            } else if let response = response, let data = data {
                 _ = downstream.receive((data, response))
                 downstream.receive(completion: .finished)
             } else {
diff --git a/Sources/PublisherKit/Publishers/URLSession/Validate.swift b/Sources/PublisherKit/Publishers/URLSession/Validate.swift
index aa04680..dce8b3d 100644
--- a/Sources/PublisherKit/Publishers/URLSession/Validate.swift
+++ b/Sources/PublisherKit/Publishers/URLSession/Validate.swift
@@ -18,9 +18,9 @@ public enum AcceptableContentTypes {
 
 extension Publishers {
     
-    public struct Validate<Upstream: Publisher>: Publisher where Upstream.Output == (data: Data, response: HTTPURLResponse) {
+    public struct Validate<Upstream: Publisher>: Publisher where Upstream.Output == (data: Data, response: URLResponse) {
         
-        public typealias Output = Upstream.Output
+        public typealias Output = (data: Data, response: HTTPURLResponse)
         
         public typealias Failure = Error
         
@@ -159,7 +159,11 @@ private extension Publishers.Validate.Inner {
     
     func validate(input: Input) -> Result<Downstream.Input, Downstream.Failure> {
         
-        let (data, response) = input
+        let (data, _response) = input
+        
+        guard let response = _response as? HTTPURLResponse else {
+            return .failure(URLError.onlyHTTPSupported())
+        }
         
         guard acceptableStatusCodes.contains(response.statusCode) else {