How do I Access Response Header in Http Request - asp-classic

Question

I'm making a call to an external API. The data it returns, annoyingly, is in the header (the text response is empty).
How do I access the header of the response?
This is what I'm trying:
Dim httpRequest, postResponse
Set httpRequest = Server.CreateObject("MSXML2.ServerXMLHTTP")
httpRequest.Open "POST", "http://www.api.com", False, "un", "pw"
httpRequest.SetRequestHeader "Content-Type", "application/json"
httpRequest.setRequestHeader "Content-Length", len(jsondata)
httpRequest.Send data
if httpRequest.status = 200 then
response.write httpRequest.getResponseHeader
response.write httpRequest.ResponseText
end if
Set httpRequest = nothing
But it gives me:
msxml3.dll error '80072f76'
The requested header was not found
And a bonus question: I just noticed the "XML" part of "MSXML2.ServerXMLHTTP" - am I using the right protocol? It's always worked for straight posts and gets until now.

Answer 1

You need to specify the name of the response header you want to retrieve:
response.write httpRequest.getResponseHeader("SomeHeaderName")
There's no just one response header. There could be many. You have the standard response headers such as Content-Type and you could also have custom headers.
And a bonus question: I just noticed the "XML" part of
"MSXML2.ServerXMLHTTP" - am I using the right protocol?
Yes, absolutely, that's the correct COM object to be used from a classic ASP application to send HTTP requests.