dotnet/aspnetcore

HttpRequest.Form throws an undocumented System.InvalidOperationException

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#49,096 建立於 2023年6月29日

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描述

Is there an existing issue for this?

  • I have searched the existing issues

Describe the bug

After upgrading from ASP.NET Core 3.x to ASP.NET Core 6, we found that HttpRequest.Form throws an undocumented System.InvalidOperationException with the message "Incorrect Content-Type: image/png".

System.InvalidOperationException: Incorrect Content-Type: image/png
   at Microsoft.AspNetCore.Http.Features.FormFeature.ReadForm()
   at Microsoft.AspNetCore.Http.DefaultHttpRequest.get_Form()

This seems to only affect image files. Using the same code to read CSV files continues to work.

Expected Behavior

Form object is returned.

Steps To Reproduce

No response

Exceptions (if any)

System.InvalidOperationException

.NET Version

7.0.304

Anything else?

貢獻者指南

技術棧
csharp
領域
backend
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
ASP.NET Core basicsHTTP knowledge
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
55
研究方向
The issue points to the FormFeature.ReadForm() method in the ASP.NET Core source code (likely Microsoft.AspNetCore.Http.Features.FormFeature). The error occurs when the content type is not a form type (e.g., image/png). Investigate the content type validation logic there and consider whether the exception message should be improved or the form read should be allowed for non form content types. Also, review the linked documentation for HttpRequest.Form to see if the exception is now expected behavior.