Can't get value by Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestHeaders.TryGetValue()

[KamenRiderKuuga]

Describe the bug

When I want to get the header value from http request, I found something different from what I expected

To Reproduce

1. Create a new ASP.NET Core Web API project.
2. Add a global filter to the project.
3. Send request with headers.
4. Try to get header value from Request.Headers by TryGetValue()

Go with the sample project

1. Get the sample project from:https://github.com/GadHao/ProjectForReproduce/tree/main/GetValueFromRequestHeader
2. Run the project
3. Send request with header. For example, using the Windows command line: curl -i -H "Accept: application/json" -H "one: 111" -H "two: 222" -H "three: 333" http://localhost:5000/weatherforecast
4. See the output window

Exceptions (if any)

Can't get header value by headers.TryGetValue(key , out var value), but can get it from header[key]

If you go with the sample project, you will see:

header one :111
header two :
header three :
header one :111
header two :222
header three :333

Further technical details

.NET version: Reproduced in .NET Core 3.1 and .NET 5.0

[adityamandaleeka]

@GadHao Looks like you have some stray commas in your code :smile:

-            headers.TryGetValue("two,", out var two);
+            headers.TryGetValue("two", out var two);

[KamenRiderKuuga]

Embarrassed, I even spent a morning on it