Createobject("MSXML2.ServerXMLHTTP.6.0"). Why does the "POST" request change to "GET"?

Question

ASP.NET

I have code:

set http = Createobject("MSXML2.ServerXMLHTTP.6.0")
url="https://www.appliancesconnection.com/login.html"
login_name="XXXXXX"
login_pass="XXXXXX"
query="email="+login_name+"&password="+password_pass
http.Open "POST",url,false
http.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
http.send(query)
text=http.responsetext

After checking the request, I find out that the request did not leave as "POST", but was processed as "GET", of course, login is not carried out. What is the reason?