excel - VBA Asynchronous data call with HTTP -

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i have made handy vba function returns http status of given url using msxml2.serverxmlhttp object. function executed synchronously , rest of code freezes until request resolved. how turn asynch call?

current working function:

function page_http_status(url) string              dim xmlhttp object              set xmlhttp = createobject("msxml2.serverxmlhttp")             xmlhttp.open "get", url, false             xmlhttp.setrequestheader "content-type", "application/x-www-form-urlencoded"             xmlhttp.setrequestheader "user-agent", "mozilla/5.0 (windows nt 6.1; rv:25.0) gecko/20100101 firefox/25.0"              xmlhttp.send             page_http_status = xmlhttp.status  end function

onreadystatechange attempt

i know there xmlhttp.onreadystatechange event can trigger named callback function, how can trigger function return value page_http_status()? 

xmlhttp.onreadystatechange = functionreadystatechange

and then

function functionreadystatechange ()  msgbox ("request received! " & xmlhttp.status)  end function

after further reading realised vba not support callback functions out of box.

using xmlhttp.onreadystatechange viable solution require work around 2 limitations:

1) xmlhttp have declared publicly in order keep object's scope available "callback" (this fine).

2) original function not return value have save output in procedure (instead of "scalar" function returns output).


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