Produces<string>() should default to "text/plain" rather than "application/json"

[halter73]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Produces<string>() defaults to "application/json" like it does for all calls that don't explicitely specify the Content-Type.

aspnetcore/src/Http/Routing/src/Builder/OpenApiRouteHandlerBuilderExtensions.cs

Lines 77 to 80 in 3ca6b33

	if (responseType is Type && string.IsNullOrEmpty(contentType))
	{
	contentType = "application/json";
	}

This is unintuitive behavior.

Expected Behavior

string should be special-cased to default to a "text/plain" content-type instead.

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

No response

Anything else?

See #43961 (comment)

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