http 417 error while calling a web service

Hi Friends
 
i got a this exception when i calling my web service in producction server.
i already test the web service in server side and this don't have problemas
but when i calling the web service in the development site this throw
a
(spanish)"Error de la solicitud con el código de estado HTTP 417: Expectation failed."  or
(english)"The request failed with status code HTTP 417: Expectation failed."
 
Thanks , i really apreciate your help!
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