rest-assured/src/main/java/io/restassured/builder/RequestSpecBuilder.java
public RequestSpecBuilder addParam(String parameterName, Object... parameterValues) {
        spec.param(parameterName, parameterValues);
        return this;
    }
public RequestSpecBuilder addParam(String parameterName, Object... parameterValues) {
        spec.param(parameterName, parameterValues);
        return this;
    }
Add a parameter to be sent with the request.

@param parameterName   The parameter name
@param parameterValues Zero to many parameter values for this parameter name.
@return The request specification builder