News Stream Server: Command parameters can get invalid

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Problem description

At the moment requests are checked when the HTTP request is executed.
If all parameters are valid a command gets stacked.
In case many requests get stacked the chances are that one of the stacked command makes the parameters of the new command invalid, so the server will not be able to execute the command properly.

Possible solution

The parameters have to be checked twice.
Firstly when the request is handled, secondy when the command is getting executed.