[Bug]: CNB软件源似乎无法使用 #830
Description
Affected Version
Collapse 1.83.12 Preview
Bug Behavior
使用CNB软件源检查启动器更新时报错：
System.Text.Json.JsonException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
---> System.Text.Json.JsonReaderException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. LineNumber: 0 | BytePositionInLine: 0.
at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader&, ExceptionResource, Byte, ReadOnlySpan1) + 0x15 at System.Text.Json.Utf8JsonReader.Read() + 0x6b at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader&, T&, JsonSerializerOptions, ReadStack&) + 0x3c
--- End of inner exception stack trace ---
at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack&, JsonReaderException) + 0x2ea
at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader&, T&, JsonSerializerOptions, ReadStack&) + 0x14c at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader&, ReadStack&) + 0x2d
at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1, JsonTypeInfo1, Nullable1) + 0xe5 at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1, JsonTypeInfo1) + 0x10f at System.Text.Json.JsonSerializer.Deserialize[TValue](String, JsonTypeInfo1) + 0x57
at Velopack.Sources.SimpleWebSource.d__12.MoveNext() + 0xc2
--- End of stack trace from previous location ---
at Velopack.UpdateManager.d__37.MoveNext() + 0x8c
--- End of stack trace from previous location ---
at CollapseLauncher.Helper.Update.LauncherUpdateHelper.d__9.MoveNext() + 0x89
--- End of stack trace from previous location ---
at CollapseLauncher.Pages.SettingsPage.d__30.MoveNext() + 0x78
Expected Behavior
应该正常检查更新，毕竟官方文档提到：
Available CDNs:
1、GitHub (Main)
2、Cloudflare (Cloudfare R2, Southeast Asia region)
3、GitLab
3、CNB (Mainland China)
（来源：https://collapselauncher.com/docs/development-workflows.html）
Steps to reproduce
左侧边栏“程序设置”->“仓库CDN”把CDN设置为CNB，再检查更新
Related Issues
No response
Screenshot(s)
