Request QueryString key names became case-sensitive

[LazZiya]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Query string key names are case sensitive, I found a similar issue #35662 that was solved but it is locked now. However, I face the same issue with Asp.Net Core .Net 9.0.

I also checked the docs in Model Binding in ASP.NET Core and it is mentioned that name matching is not case-sensitive!

https://contoso.com/api/pets/2?DogsOnly=true
Looks through the sources and finds "DogsOnly=true" in the query string. Name matching is not case-sensitive.

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

9.0.304

Anything else?

No response

[javiercn]

@LazZiya thanks for contacting us.

Can you give us more details? What type of app are you building. What APIs are you using to bind to the query string? Better yet, could you provide a minimal repro project as a public github repository? That'll ensure we don't miss anything.

[dotnet-policy-service]

Hi @@LazZiya. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[LazZiya]

Sorry for inconvenience, it was due to a front-end TypeScript that has case sensitive pre-defined key names.