public String getRequest(String endpoint, HashMap<String, Object> parameters) throws SmartsheetException {
        return passthroughRequest(HttpMethod.GET, endpoint, null, parameters);
    }
public String getRequest ( String endpoint , HashMap < String , Object > parameters ) throws SmartsheetException { return passthroughRequest ( HttpMethod . GET , endpoint , null , parameters ) ; }
Issue an HTTP GET request.

@param endpoint the API endpoint
@param parameters optional list of resource parameters
@return a JSON response string
@throws IllegalArgumentException if any argument is null or empty string
@throws InvalidRequestException if there is any problem with the REST API request
@throws AuthorizationException if there is any problem with  the REST API authorization (access token)
@throws ResourceNotFoundException if the resource cannot be found
@throws ServiceUnavailableException if the REST API service is not available (possibly due to rate limiting)
@throws SmartsheetException if there is any other error during the operation