Simple open file example:
req1
httpdoreq1()

Client request to remote google SOAP. Remember to add API key in soapreq.xml
req2noproxy
httpdoreq2noproxy() will work depending on browser the security settings

Google SOAP request as local (proxycurl.php).
req2
httpdoreq2() fired on onload using httpfireonload()

Client HEAD request to local file:
req3
httpdoreq3() on the file helloworld.txt

httpdoreq4custom() will launch custom function defined in $req4custom->onreadydo