How do I send Parameters by using HTTP POST with OLE Automation Procedures

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SQL-Server

HTTP

SOAP

automation

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Hi,

I'm using the OLE Automation Procedures to send a HTTP POST Request to a SOAP-Webservice and process the returned data. This works fine for me by using the code snipped below. Now I need to pass a POST-parameter over to the webservice.
Any idea how i could do that?

Parameter: searchstring
Value: V34432221

DECLARE @XMLResponse xml
DECLARE @obj INT
DECLARE @ValorDeRegreso INT
DECLARE @sUrl NVARCHAR(200)
DECLARE @response VARCHAR(MAX)
DECLARE @hr INT
DECLARE @src NVARCHAR(255)
DECLARE @desc NVARCHAR(255)
SET @sUrl = 'http://server/Webservice/Service1.asmx/Suche'
EXEC sp_OACreate 'MSXML2.ServerXMLHttp', @obj OUT
EXEC sp_OAMethod @obj, 'Open', NULL, 'POST', @sUrl, false
EXEC sp_OAMethod @obj, 'send'
EXEC sp_OAGetProperty @obj, 'responseText', @XMLResponse OUT
--process @XMLResponse...