Is it possible to use a wildcard in the middle of a DNS name?

[atrauzzi]

For example: something.?.my2nd.localhost

[MihaZupan]

Are you looking for dotnet/aspnetcore#19369?

[atrauzzi]

Hmm, I'm running through Aspire if that helps.

[MihaZupan]

If #2945 (reply in thread) does not answer your question, please be more specific about what you are trying to accomplish.

[atrauzzi]

What kind of additional details would be helpful?

I'm using yarp via Aspire and I want to have a wildcard in the middle of a hostname. Similar to how I originally described: something.?.my2nd.localhost

When I try to configure a hostname with a wildcard in the middle, it doesn't appear to work. It was suggested by @davidfowl on Discord that I come here to see if I could get an answer.

(I don't think it's as important that you focus on the Aspire or aspnetcore aspect, so much as whether it's a capability that yarp supports. If it is, then I can at least rule it out and focus my question more on why Aspire isn't allowing it.)

[MihaZupan]

E.g. what your Aspire configuration looks like & what you've tried to do, whether by "I want to have a wildcard in the middle of a hostname" you're referring to limiting incoming connections (accepted hosts) vs. trying to specify that as the host for outgoing requests.

If you're looking at it as a routing constraint (not matching requests that don't match that host pattern), that's what the ASP.NET Core feature linked above is tracking - dotnet/aspnetcore#19369. YARP isn't doing anything special when it comes to host routing - we're deferring to ASP.NET, so we don't currently support it out of the box.
If you drop down to code, you always have the option to write your own middleware that does such checks manually so that you're not completely blocked on that feature.

[davidfowl]

Ah yes! This is a routing request...