Not directly. You receive the whole response and can process it line by line, terminating wherever you wish.

I'd recommend using WebSockets if possible.

First of all, you're calling class methods, so you don't need a file object. Instead of:

s file=##class(%File).%New()
d file.CopyFile(File,ArchivePath)
d file.Delete(File)

It's enough to write:

do ##class(%File).CopyFile(File,ArchivePath)
do ##class(%File).Delete(File)

Other things to consider:

• You have file and File variables. That makes understanding what's going on more difficult than it should be.
• Using full command names (set instead of s, do instead of d, etc.)

But, %File class has a method specifically for moving, so it's better to call it:

set Success = ##class(%File).Rename(File, ArchivePath, .RetCode)
write:(Success=$$$NO) "Rename failed with code: " _ RetCode

What do you want to do? Complete tasks externally and pass them into Ensemble?
Check out Ensemble Workflow - REST API for Ensemble workflow and Ensemble Workflow UI - client web application consuming that REST interface. Community article.

SOAP interface would be about the same.

I have encountered the exact same problem but was unable to reproduce it. In my case recompilation helped. Try to  recompile SALUTIC.MyUsers.BO.UsersREST. Please contact the WRC if you can reproduce this behavior.

If you're trying to access data across several namespaces of the same instance you don't need xDBC.  Use either mappings or queries with local cache to move data.

Try:

%request.Content.Data.Read($$$MaxStringLength)

If you have json you can cast it into object without reading the stream in user code:

Set obj = {}.%FromJSON(%request.Content.Data)

Same for XML (you can get it from Stream or even from url).

catch-scope is not seems to be reached

Have you enabled logging?

Error occurs on saving incorrect data and not on setting the data. Saving also does not throw an exception, only returns an error status.

Also you need to quit something:

#dim sc As %Status = $$$OK

try
{
  set myClass= ##class(SomeClass).%New()
  myClass.Date =  Sourcedata.Date  //Sourcedata send us wrong format to that datefield.
  set sc = myClass.%Save() // Error occurs on save.
} catch ex {
  set sc = ex.AsStatus()
  set errMsg = "Error in this method "  _ $System.Status.GetOneStatusText(sc)
  $$$LOGERROR(errMsg)
}
quit sc

On a side note, you're using 3 different naming conventions for variables in your snippet:

• tHungarianNotation
• CapitalCase
• lowercase

It would probably be better to decide on one notation.