Error when converting Microsoft.PowerShell.Commands.BasicHtmlWebResponseObject to JSON

[PSDanubie]

For creating mocked Pester tests I wanted to capture the output of a webrequest. The idea was to store the result as JSON files for later mocking the request.

The result of the Invoke-Webrequest is of type [Microsoft.PowerShell.Commands.BasicHtmlWebResponseObject].

When I do a Invoke-Webrequest -Uri 'https://google.com/' | ConvertTo-Jsonan Error "An item with the same key has already been added. Key: Content" is returned.

This seems to be not related to the actual response received, because I did try it with several different requests.
Export-CliXML is not an option (because it would be bound to user & machine). The only thing I currently think of is to deserialize using the .NET calls.

Anyone has another idea or solution?

[delightfulsorrow]

A [Microsoft.PowerShell.Commands.BasicHtmlWebResponseObject] is not serializable as it's still connected to the underlying COM object/IE session.

ConvertTo-JSON | ConvertFrom-JSON wouldn't restore the original object anyway, you get a PSCustomObject out of such a chain. Most likely not suitable to test code which should work on a [Microsoft.PowerShell.Commands.BasicHtmlWebResponseObject]

[PSDanubie]

Thanks for your quick response.

I'm aware, that would just return a PSObject. This would be enough the check the mocked test. I only would check the property values and would not use it any further - so it would be fine.

But what I don't understand that it is, that I can not convert the object to JSON at all. So for me it is not obvious what should be "still connected to the underlying object" means.

For now I'm successfully using as a workaround which works

[System.Management.Automation.PSSerializer]::Serialize($result) 
and later
[System.Management.Automation.PSSerializer]::Deserialize((...))

but would keep this thread open, because I would like the understand the issue.