Bug Report: (429) Too Many Requests Error when downloading many chapters

[Anonym242i5]

Describe the bug
When attempting to download many chapters in Advanced Kea (starting from chapter 200 to end), the application throws an unhandled exception and crashes with a (429) Too Many Requests error.

To Reproduce
Steps to reproduce the behavior:

Add title 2582 (omniscient-reader) to the queue

Set "start at chapter" = 200, and "end at chapter" = end

Set output format to PDF, enable "Highest Quality", and "Skip downloaded chapters"

Click "Start"

Application crashes shortly after starting the download

Expected behavior
The application should either:

Pause and retry automatically after receiving a 429

Or allow the user to configure a delay between requests to avoid rate-limiting
Screenshots

error:************** Ausnahmetext **************
System.Net.WebException: Der Remoteserver hat einen Fehler zurückgegeben: (429) Too Many Requests.
bei System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
bei System.Net.WebClient.DownloadString(Uri address)
bei System.Net.WebClient.DownloadString(String address)
bei Kea.Main.d__14.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
bei Kea.Main.d__13.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
bei Kea.Main.<startBtn_Click>d__12.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
bei System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c.b__6_0(Object state)

************** Geladene Assemblys **************
mscorlib
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9310.0 built by: NET481REL1LAST_C.
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll.

Kea
Assembly-Version: 1.0.0.0.
Win32-Version: 1.0.0.0.
CodeBase: file:///D:/Mohammed/B%C3%BCcher/webtooon/Kea.v1.3.4/AdvancedKea%20v1.3.5/AdvancedKea.exe.

System.Windows.Forms
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9251.0 built by: NET481REL1LAST_C.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll.

System
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9310.0 built by: NET481REL1LAST_C.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll.

System.Drawing
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.

System.Configuration
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll.

System.Core
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9297.0 built by: NET481REL1LAST_C.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll.

System.Xml
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll.

System.Windows.Forms.resources
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms.resources/v4.0_4.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.

System.Web
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9282.0 built by: NET481REL1LAST_C.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_32/System.Web/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Web.dll.

mscorlib.resources
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_de_b77a5c561934e089/mscorlib.resources.dll.

HtmlAgilityPack
Assembly-Version: 1.11.46.0.
Win32-Version: 1.11.46.
CodeBase: file:///D:/Mohammed/B%C3%BCcher/webtooon/Kea.v1.3.4/AdvancedKea%20v1.3.5/HtmlAgilityPack.DLL.

System.resources
Assembly-Version: 4.0.0.0.
Win32-Version: 4.8.9037.0 built by: NET481REL1.
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.resources/v4.0_4.0.0.0_de_b77a5c561934e089/System.resources.dll.

************** JIT-Debuggen **************
Um das JIT-Debuggen (Just-In-Time) zu aktivieren, muss in der
Konfigurationsdatei der Anwendung oder des Computers
(machine.config) der jitDebugging-Wert im Abschnitt system.windows.forms festgelegt werden.
Die Anwendung muss mit aktiviertem Debuggen kompiliert werden.

Zum Beispiel:

Wenn das JIT-Debuggen aktiviert ist, werden alle nicht behandelten
Ausnahmen an den JIT-Debugger gesendet, der auf dem
Computer registriert ist, und nicht in diesem Dialogfeld behandelt.

Environment:

Version: Advanced Kea v1.3.5

OS: Windows 10 (German)

.NET Framework: 4.8.9310.0

Additional context
The error seems to result from sending too many requests too quickly. A retry logic or throttle option could help prevent this crash. Alternatively, a configurable delay would help users avoid getting rate-limited.

[Leahnaya]

@Anonym242i5 this issue is fixed in my PR #6 . I'm not sure if this repository is maintained anymore, so I did build a version with that updated code that you can find on my GitHub page if you are unable to build yourself.