Using MSXML2.ServerXMLHttp in MS SQL 2012 - receiving error "The Parameter is incorrect".

Question

I have a procedure used to make http post requests to a REST web service external to my SQL server, using MSXML2.ServerXMLHttp via POST request. This procedure works without issue in SQL 2008 r2, but upon upgrade to 2012, begins to fail with the message
: "The Parameter is incorrect."
It is failing when I attempt to exec the 'send' method on line 137. I cannot find any documentation about how the MSXML2.ServerXMLHttp object needs to be treated differently in 2012. I found a similar question here: http://social.technet.microsoft.com/Forums/sqlserver/en-US/a6de1eea-5fe9-4087-809b-524c98f20a4d/msxml6dll-methodsend-dont-work-in-windows-server-2012-and-sql-2008r2?forum=sqlxml 
But it isn't resovled - just indications to file a bug report - and one solution that says to just copy the DLL from 2008 over to 2012 to fix the issue. Is that really the right solution here or does someone have information on how to do this properly with
2012?
Here is my procedure:
CREATE procedure [dbo].[HTTP_REQUEST](@response varchar(4000) out, 
@method varchar(64),
@p1name varchar(256) = null,
@p1value varchar(max) = null,
@p2name varchar(256) = null,
@p2value varchar(max) = null,
@p3name varchar(256) = null,
@p3value varchar(max) = null,
@p4name varchar(256) = null,
@p4value varchar(max) = null,
@p5name varchar(256) = null,
@p5value varchar(max) = null,
@p6name varchar(256) = null,
@p6value varchar(max) = null,
@parent_table varchar(30) = null
As
Declare
@obj int
,@hr int
,@status int
,@msg varchar(255)
,@apiKey varchar (64)
,@params varchar (max)
SET @apiKey = (Select a.default_value from T_DEFAULTS a WHERE a.parent_table = @parent_table AND a.field_name = 'm2apiKey')
SET @params = ''
If @apiKey is null
  Begin
select @msg = 'Invalid mail2 APIKey'
RAISERROR(@msg, 11, 2) WITH SETERROR
return -101
  End
If @method is null
  Begin
select @msg = 'No valid mail2 API method provided'
RAISERROR(@msg, 11, 2) WITH SETERROR
return -101
  End
exec @hr = sp_OACreate 'MSXML2.ServerXMLHttp', @obj OUT
if @hr <> 0 begin Raiserror('sp_OACreate MSXML2.ServerXMLHttp.3.0
failed', 16,1) return end
exec @hr = sp_OAMethod @obj, 'open', NULL, 'POST', 'http://api.someapiurl.net/REST/', true
if @hr <>0 begin set @msg = 'sp_OAMethod Open failed' goto eh end
exec @hr = sp_OAMethod @obj, 'setRequestHeader', NULL, 'Content-Type',
'application/x-www-form-urlencoded'
if @hr <>0 begin set @msg = 'sp_OAMethod setRequestHeader failed' goto
eh end
--Set Timeouts
exec @hr = sp_OAMethod @obj, 'setTimeouts',NULL,5000,5000,10000,10000
if @hr <>0 begin set @msg = 'sp_OAMethod setTimeouts failed' goto
eh end
--Add Method
SET @params = '&method='+@method
--Add API key
SET @params = @params + '&key='+@apiKey
--Add p1 if present
IF @p1name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p1name + '=' + @p1value
END
--Add p2
IF @p2name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p2name + '=' + @p2value
END
--Add p3
IF @p3name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p3name + '=' + @p3value
END
--Add p4
IF @p4name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p4name + '=' + @p4value
END
--Add p5
IF @p5name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p5name + '=' + @p5value
END
--Add p6
IF @p6name IS NOT NULL
BEGIN
SET @params = @params + '&' + @p6name + '=' + @p6value
END
--SELECT @params
--Send the request
exec @hr = sp_OAMethod @obj, send, NULL, @params
if @hr <>0 begin set @msg = 'sp_OAMethod Send failed' goto eh end
--Get the status
exec @hr = sp_OAGetProperty @obj, 'status', @status OUT
if @hr <>0 begin set @msg = 'sp_OAGetProperty read status failed on get status' goto
eh
end
if @status <> 200 begin set @msg = 'sp_OAMethod http status ' +
str(@status) goto eh end
if @status = 200 begin print 'sp_OAMethod http status is 200:Successful ' +
str(@status) + @params end
exec @hr = sp_OAGetProperty @obj, 'responseText', @response OUT
if @hr <>0 begin set @msg = 'sp_OAGetProperty read response failed on get response text error code' + convert(varchar,@hr) goto
eh end
exec @hr = sp_OADestroy @obj
return
eh:
exec @hr = sp_OADestroy @obj
Raiserror(@msg, 16, 1)
return
Many thanks for the input - 
Chris

Answer 1

How can I fix the problem? changing the OS? I just bought the new server. I do?
thanks
Miky
Rambaldi