dotnet/aspnetcore

HttpRequest.Form throws an undocumented System.InvalidOperationException

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#49,096 创建于 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?

贡献者指南

技术栈
csharp
领域
backend
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
active
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
ASP.NET Core basicsHTTP knowledge
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.