Another post with little script:

Set o = CreateObject("MSXML2.XMLHTTP")
o.open "GET", "https://page.com", False
o.setRequestHeader "Header", "Header value"

' Ignore certs (I bet you want to know how to do it)
' 2 stands for SXH_OPTION_IGNORE_SERVER_SSL_CERT_ERROR_FLAGS
' 13056 means ignore all server side cert error
o.setOption 2, 13056
o.send

' Read response
WScript.Echo po.responseBody

And for JSON serialization you might use this page