diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e064e4a..40b7c49d 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 - Merged "Fix ios multiple flutter presenting error" [#1736](https://github.com/pichillilorenzo/flutter_inappwebview/pull/1736) (thanks to [AlexT84](https://github.com/AlexT84))
 - Merged "fix cert parsing for ios 12" [#1822](https://github.com/pichillilorenzo/flutter_inappwebview/pull/1822) (thanks to [darkang3lz92](https://github.com/darkang3lz92))
 - Merged "Fix iOS and macOS Forced unwrap null value HTTPCookie for CookieManager.setCookie" [#1677](https://github.com/pichillilorenzo/flutter_inappwebview/pull/1677) (thanks to [maxmitz](https://github.com/maxmitz))
+- Fixed "iOS about:blank popup not loading page" [#1500](https://github.com/pichillilorenzo/flutter_inappwebview/issues/1500)
 
 ## 6.0.0-beta.25
 
diff --git a/ios/Classes/InAppBrowser/InAppBrowserWebViewController.swift b/ios/Classes/InAppBrowser/InAppBrowserWebViewController.swift
index bd475d03..f96f9053 100755
--- a/ios/Classes/InAppBrowser/InAppBrowserWebViewController.swift
+++ b/ios/Classes/InAppBrowser/InAppBrowserWebViewController.swift
@@ -145,9 +145,9 @@ public class InAppBrowserWebViewController: UIViewController, InAppBrowserDelega
             }
         }
         
-        if let wId = windowId, let webViewTransport = plugin?.inAppWebViewManager?.windowWebViews[wId] {
-            webView?.load(webViewTransport.request)
+        if let wId = windowId {
             channelDelegate?.onBrowserCreated()
+            webView?.runWindowBeforeCreatedCallbacks()
         } else {
             if #available(iOS 11.0, *) {
                 if let contentBlockers = webView?.settings?.contentBlockers, contentBlockers.count > 0 {
diff --git a/ios/Classes/InAppWebView/FlutterWebViewController.swift b/ios/Classes/InAppWebView/FlutterWebViewController.swift
index 6fef9088..5eda9f19 100755
--- a/ios/Classes/InAppWebView/FlutterWebViewController.swift
+++ b/ios/Classes/InAppWebView/FlutterWebViewController.swift
@@ -138,8 +138,8 @@ public class FlutterWebViewController: NSObject, FlutterPlatformView, Disposable
             }
             load(initialUrlRequest: initialUrlRequest, initialFile: initialFile, initialData: initialData)
         }
-        else if let wId = windowId, let webViewTransport = webView.plugin?.inAppWebViewManager?.windowWebViews[wId] {
-            webView.load(webViewTransport.request)
+        else if let wId = windowId {
+            webView.runWindowBeforeCreatedCallbacks()
         }
     }
     
diff --git a/ios/Classes/InAppWebView/InAppWebView.swift b/ios/Classes/InAppWebView/InAppWebView.swift
index 4bf17c80..9b30b023 100755
--- a/ios/Classes/InAppWebView/InAppWebView.swift
+++ b/ios/Classes/InAppWebView/InAppWebView.swift
@@ -20,6 +20,7 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
     var plugin: SwiftFlutterPlugin?
     var windowId: Int64?
     var windowCreated = false
+    var windowBeforeCreatedCallbacks: [() -> ()] = []
     var inAppBrowserDelegate: InAppBrowserDelegate?
     var channelDelegate: WebViewChannelDelegate?
     var settings: InAppWebViewSettings?
@@ -1774,12 +1775,6 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
     public func webView(_ webView: WKWebView,
                  decidePolicyFor navigationAction: WKNavigationAction,
                  decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
-        
-        if windowId != nil, !windowCreated {
-            decisionHandler(.cancel)
-            return
-        }
-        
         var decisionHandlerCalled = false
         let callback = WebViewChannelDelegate.ShouldOverrideUrlLoadingCallback()
         callback.nonNullSuccess = { (response: WKNavigationActionPolicy) in
@@ -1798,10 +1793,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
             callback?.defaultBehaviour(nil)
         }
 
-        if let useShouldOverrideUrlLoading = settings?.useShouldOverrideUrlLoading, useShouldOverrideUrlLoading, let channelDelegate = channelDelegate {
-            channelDelegate.shouldOverrideUrlLoading(navigationAction: navigationAction, callback: callback)
+        let runCallback = {
+            if let useShouldOverrideUrlLoading = self.settings?.useShouldOverrideUrlLoading, useShouldOverrideUrlLoading, let channelDelegate = self.channelDelegate {
+                channelDelegate.shouldOverrideUrlLoading(navigationAction: navigationAction, callback: callback)
+            } else {
+                callback.defaultBehaviour(nil)
+            }
+        }
+        
+        if windowId != nil, !windowCreated {
+            windowBeforeCreatedCallbacks.append(runCallback)
         } else {
-            callback.defaultBehaviour(nil)
+            runCallback()
         }
     }
     
@@ -1946,12 +1949,6 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
     }
     
     public func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
-        
-        if windowId != nil, !windowCreated {
-            completionHandler(.cancelAuthenticationChallenge, nil)
-            return
-        }
-        
         var completionHandlerCalled = false
         if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodHTTPBasic ||
             challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodDefault ||
@@ -2025,10 +2022,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedHttpAuthRequest(challenge: HttpAuthenticationChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedHttpAuthRequest(challenge: HttpAuthenticationChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
@@ -2076,10 +2081,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedServerTrustAuthRequest(challenge: ServerTrustChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedServerTrustAuthRequest(challenge: ServerTrustChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodClientCertificate {
@@ -2135,10 +2148,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedClientCertRequest(challenge: ClientCertChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedClientCertRequest(challenge: ClientCertChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else {
@@ -2471,6 +2492,7 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
                         createWebViewWith configuration: WKWebViewConfiguration,
                   for navigationAction: WKNavigationAction,
                   windowFeatures: WKWindowFeatures) -> WKWebView? {
+        
         var windowId: Int64 = 0
         let inAppWebViewManager = plugin?.inAppWebViewManager
         if let inAppWebViewManager = inAppWebViewManager {
@@ -2478,16 +2500,15 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
             windowId = inAppWebViewManager.windowAutoincrementId
         }
         
-        let windowWebView = InAppWebView(id: nil, plugin: nil, frame: CGRect.zero, configuration: configuration, contextMenu: nil)
+        let windowWebView = InAppWebView(id: nil, plugin: nil, frame: self.bounds, configuration: configuration, contextMenu: nil)
         windowWebView.windowId = windowId
-        
+
         let webViewTransport = WebViewTransport(
             webView: windowWebView,
             request: navigationAction.request
         )
 
         inAppWebViewManager?.windowWebViews[windowId] = webViewTransport
-        windowWebView.stopLoading()
         
         let createWindowAction = CreateWindowAction(navigationAction: navigationAction, windowId: windowId, windowFeatures: windowFeatures, isDialog: nil)
         
@@ -2518,11 +2539,6 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
     public func webView(_ webView: WKWebView,
                         authenticationChallenge challenge: URLAuthenticationChallenge,
                         shouldAllowDeprecatedTLS decisionHandler: @escaping (Bool) -> Void) {
-        if windowId != nil, !windowCreated {
-            decisionHandler(false)
-            return
-        }
-        
         var decisionHandlerCalled = false
         let callback = WebViewChannelDelegate.ShouldAllowDeprecatedTLSCallback()
         callback.nonNullSuccess = { (action: Bool) in
@@ -2541,10 +2557,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate,
             callback?.defaultBehaviour(nil)
         }
         
-        if let channelDelegate = channelDelegate {
-            channelDelegate.shouldAllowDeprecatedTLS(challenge: challenge, callback: callback)
+        let runCallback = {
+            if let channelDelegate = self.channelDelegate {
+                channelDelegate.shouldAllowDeprecatedTLS(challenge: challenge, callback: callback)
+            } else {
+                callback.defaultBehaviour(nil)
+            }
+        }
+        
+        if windowId != nil, !windowCreated {
+            windowBeforeCreatedCallbacks.append(runCallback)
         } else {
-            callback.defaultBehaviour(nil)
+            runCallback()
         }
     }
     
@@ -3194,9 +3218,18 @@ if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
         return settings?.disableInputAccessoryView ?? false ? nil : super.inputAccessoryView
     }
     
+    public func runWindowBeforeCreatedCallbacks() {
+        let callbacks = windowBeforeCreatedCallbacks
+        callbacks.forEach { (callback) in
+            callback()
+        }
+        windowBeforeCreatedCallbacks.removeAll()
+    }
+    
     public func dispose() {
         channelDelegate?.dispose()
         channelDelegate = nil
+        runWindowBeforeCreatedCallbacks()
         removeObserver(self, forKeyPath: #keyPath(WKWebView.estimatedProgress))
         removeObserver(self, forKeyPath: #keyPath(WKWebView.url))
         removeObserver(self, forKeyPath: #keyPath(WKWebView.title))
diff --git a/macos/Classes/InAppBrowser/InAppBrowserWebViewController.swift b/macos/Classes/InAppBrowser/InAppBrowserWebViewController.swift
index 7a287778..5ab6a9af 100755
--- a/macos/Classes/InAppBrowser/InAppBrowserWebViewController.swift
+++ b/macos/Classes/InAppBrowser/InAppBrowserWebViewController.swift
@@ -100,9 +100,9 @@ public class InAppBrowserWebViewController: NSViewController, InAppBrowserDelega
         progressBar.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 0.0).isActive = true
         progressBar.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: 0.0).isActive = true
         
-        if let wId = windowId, let webViewTransport = plugin?.inAppWebViewManager?.windowWebViews[wId] {
-            webView?.load(webViewTransport.request)
+        if let wId = windowId {
             channelDelegate?.onBrowserCreated()
+            webView?.runWindowBeforeCreatedCallbacks()
         } else {
             if #available(macOS 10.13, *) {
                 if let contentBlockers = webView?.settings?.contentBlockers, contentBlockers.count > 0 {
diff --git a/macos/Classes/InAppWebView/FlutterWebViewController.swift b/macos/Classes/InAppWebView/FlutterWebViewController.swift
index fd6d03d9..df77762c 100755
--- a/macos/Classes/InAppWebView/FlutterWebViewController.swift
+++ b/macos/Classes/InAppWebView/FlutterWebViewController.swift
@@ -127,8 +127,8 @@ public class FlutterWebViewController: NSObject, /*FlutterPlatformView,*/ Dispos
             }
             load(initialUrlRequest: initialUrlRequest, initialFile: initialFile, initialData: initialData)
         }
-        else if let wId = windowId, let webViewTransport = webView.plugin?.inAppWebViewManager?.windowWebViews[wId] {
-            webView.load(webViewTransport.request)
+        else if let wId = windowId {
+            webView.runWindowBeforeCreatedCallbacks()
         }
     }
     
diff --git a/macos/Classes/InAppWebView/InAppWebView.swift b/macos/Classes/InAppWebView/InAppWebView.swift
index e5575dd5..5cee0329 100755
--- a/macos/Classes/InAppWebView/InAppWebView.swift
+++ b/macos/Classes/InAppWebView/InAppWebView.swift
@@ -19,6 +19,7 @@ public class InAppWebView: WKWebView, WKUIDelegate,
     var plugin: InAppWebViewFlutterPlugin?
     var windowId: Int64?
     var windowCreated = false
+    var windowBeforeCreatedCallbacks: [() -> ()] = []
     var inAppBrowserDelegate: InAppBrowserDelegate?
     var channelDelegate: WebViewChannelDelegate?
     var settings: InAppWebViewSettings?
@@ -1165,12 +1166,6 @@ public class InAppWebView: WKWebView, WKUIDelegate,
     public func webView(_ webView: WKWebView,
                  decidePolicyFor navigationAction: WKNavigationAction,
                  decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
-        
-        if windowId != nil, !windowCreated {
-            decisionHandler(.cancel)
-            return
-        }
-        
         var decisionHandlerCalled = false
         let callback = WebViewChannelDelegate.ShouldOverrideUrlLoadingCallback()
         callback.nonNullSuccess = { (response: WKNavigationActionPolicy) in
@@ -1188,11 +1183,19 @@ public class InAppWebView: WKWebView, WKUIDelegate,
             print(code + ", " + (message ?? ""))
             callback?.defaultBehaviour(nil)
         }
-
-        if let useShouldOverrideUrlLoading = settings?.useShouldOverrideUrlLoading, useShouldOverrideUrlLoading, let channelDelegate = channelDelegate {
-            channelDelegate.shouldOverrideUrlLoading(navigationAction: navigationAction, callback: callback)
+        
+        let runCallback = {
+            if let useShouldOverrideUrlLoading = self.settings?.useShouldOverrideUrlLoading, useShouldOverrideUrlLoading, let channelDelegate = self.channelDelegate {
+                channelDelegate.shouldOverrideUrlLoading(navigationAction: navigationAction, callback: callback)
+            } else {
+                callback.defaultBehaviour(nil)
+            }
+        }
+        
+        if windowId != nil, !windowCreated {
+            windowBeforeCreatedCallbacks.append(runCallback)
         } else {
-            callback.defaultBehaviour(nil)
+            runCallback()
         }
     }
     
@@ -1328,12 +1331,6 @@ public class InAppWebView: WKWebView, WKUIDelegate,
     }
     
     public func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
-        
-        if windowId != nil, !windowCreated {
-            completionHandler(.cancelAuthenticationChallenge, nil)
-            return
-        }
-        
         var completionHandlerCalled = false
         if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodHTTPBasic ||
             challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodDefault ||
@@ -1407,10 +1404,18 @@ public class InAppWebView: WKWebView, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedHttpAuthRequest(challenge: HttpAuthenticationChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedHttpAuthRequest(challenge: HttpAuthenticationChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
@@ -1458,10 +1463,18 @@ public class InAppWebView: WKWebView, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedServerTrustAuthRequest(challenge: ServerTrustChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedServerTrustAuthRequest(challenge: ServerTrustChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodClientCertificate {
@@ -1515,10 +1528,18 @@ public class InAppWebView: WKWebView, WKUIDelegate,
                 callback?.defaultBehaviour(nil)
             }
             
-            if let channelDelegate = channelDelegate {
-                channelDelegate.onReceivedClientCertRequest(challenge: ClientCertChallenge(fromChallenge: challenge), callback: callback)
+            let runCallback = {
+                if let channelDelegate = self.channelDelegate {
+                    channelDelegate.onReceivedClientCertRequest(challenge: ClientCertChallenge(fromChallenge: challenge), callback: callback)
+                } else {
+                    callback.defaultBehaviour(nil)
+                }
+            }
+            
+            if windowId != nil, !windowCreated {
+                windowBeforeCreatedCallbacks.append(runCallback)
             } else {
-                callback.defaultBehaviour(nil)
+                runCallback()
             }
         }
         else {
@@ -1832,11 +1853,6 @@ public class InAppWebView: WKWebView, WKUIDelegate,
     public func webView(_ webView: WKWebView,
                         authenticationChallenge challenge: URLAuthenticationChallenge,
                         shouldAllowDeprecatedTLS decisionHandler: @escaping (Bool) -> Void) {
-        if windowId != nil, !windowCreated {
-            decisionHandler(false)
-            return
-        }
-        
         var decisionHandlerCalled = false
         let callback = WebViewChannelDelegate.ShouldAllowDeprecatedTLSCallback()
         callback.nonNullSuccess = { (action: Bool) in
@@ -1855,10 +1871,18 @@ public class InAppWebView: WKWebView, WKUIDelegate,
             callback?.defaultBehaviour(nil)
         }
         
-        if let channelDelegate = channelDelegate {
-            channelDelegate.shouldAllowDeprecatedTLS(challenge: challenge, callback: callback)
+        let runCallback = {
+            if let channelDelegate = self.channelDelegate {
+                channelDelegate.shouldAllowDeprecatedTLS(challenge: challenge, callback: callback)
+            } else {
+                callback.defaultBehaviour(nil)
+            }
+        }
+        
+        if windowId != nil, !windowCreated {
+            windowBeforeCreatedCallbacks.append(runCallback)
         } else {
-            callback.defaultBehaviour(nil)
+            runCallback()
         }
     }
     
@@ -2534,9 +2558,18 @@ if(window.\(JAVASCRIPT_BRIDGE_NAME)[\(_callHandlerID)] != null) {
         }
     }
     
+    public func runWindowBeforeCreatedCallbacks() {
+        let callbacks = windowBeforeCreatedCallbacks
+        callbacks.forEach { (callback) in
+            callback()
+        }
+        windowBeforeCreatedCallbacks.removeAll()
+    }
+    
     public func dispose() {
         channelDelegate?.dispose()
         channelDelegate = nil
+        runWindowBeforeCreatedCallbacks()
         currentOpenPanel?.cancel(self)
         currentOpenPanel?.close()
         currentOpenPanel = nil