Use URL Parameters as Input
In cases where the client does not support the HTTP POST method, you can invoke the Action using the URL parameters@x-http-method. The inputs for the Action can then be specified as additional URL parameters. For example:
http://MyServer:MyPort/connector/MyAPIPortName/api.rsc/WashCar?@x-http-method=POST&URLparam1=my_url_parameter1&urlparam2=my_url_param2