如何使用Get-WebBinding选择没有主机头的绑定

Question

I have the following bindings:

I can select the binding which has the host header api like so:

However, I cannot select the binding which has no host header. If I pass in "" or $NUL , I still get all bindings:

One possible solution I've found is to filter the list using Where-Object , like so:

Is there a better way to do this which will get me the default binding with no host header and nothing else? Thanks!

Answer 1

It really looks like you can't explicitly use Get-WebBinding to get just the one with no Host Header.

Get-WebBinding returns all bindings. From the docs , our only available parameters for filtering are:

• -Name - We are already using to specify website name
• -IPAddress - N/A in this case
• -Port - can only really specify 443 which won't help
• -Protocol - can only specify https which won't help
• -HostHeader - our best hope - Let's investigate.

Our only option is to use -HostHeader . We know it accepts a type string , so we can try all tools in our toolbox:

Get-WebBinding -Name "Default Web Site" -HostHeader ""
Get-WebBinding -Name "Default Web Site" -HostHeader $null
Get-WebBinding -Name "Default Web Site" -HostHeader ([String]::Empty)
Get-WebBinding -Name "Default Web Site" -HostHeader "*"

They return all the same entries:

protocol bindingInformation sslFlags
-------- ------------------ --------
https    *:443:api          1
https    *:443:api.cluster  1
https    *:443:             0

ie all of them. This makes sense because the -HostHeader parameter is a wildcard Filter . We can only filter entries and not select entries. An "Empty" filter (ie "", $null , [String]::Empty ) is the same as returning everything (ie that's why it returned the same as the full wildcard "*" ).

We can prove this by changing the filter to:

Get-WebBinding -Name "Default Web Site" -HostHeader "api*"

Which returns:

protocol bindingInformation sslFlags
-------- ------------------ --------
https    *:443:api          1
https    *:443:api.cluster  1

The exact opposite of what we want.

Since Get-WebBinding only has filtering parameters, we need to combine it with a selection parameter like Where-Object . Since sslflags is the flag for "Require Server Name Indication", the "better" way is to select based on the bindingInformation :

Get-WebBinding -Name "Default Web Site" | Where-Object { $_.bindingInformation -eq '*:443:' }

Returning what we want:

protocol bindingInformation sslFlags
-------- ------------------ --------
https    *:443:             0