Change Uri after create Json file ()

[nabdev]

I have been trying to edit a Uri of my Command after create my file Json ($command->getOperation()->setUri($new_uri)) , how can i ? i use setUri of Operation Class but i have error like add a get Data every call of my command execute .
error message like : 
[url] http://baseurl/api/v1/statements/78.json?_value1=1402322914&value2=8&_value1=1402322914&value2=8&_value1=1402322914&value2=8 (repeat of '_value1=1402322914&value2=8" number of call )
i am use : https://github.com/misd-service-development/guzzle-bundle (Guzzle ~3.0)

Thanks

NABIL

[nabdev]

I find it normaly by use : $command->prepare()->serPath().