Service call filter

The Service call filter is used to call StreamServer applications exposed as services via Service Request input connectors. Data arriving to an input or output connector with a Service call filter is passed on to the service defined by the Service name and Service version settings in the filter.

You can use the Service call filter to access a service in the same application domain. If the called service is configured to return the output in the response, this output is returned via the filter. This method for returning the response can be used instead of internal output/input connectors to loop data within the same Project (i.e. StreamServer application).

You can create a filter chain that contains several Service call filters. When data arrives to the connector it is passed on to the service called by the first Service call filter. The response from the service is then returned, and this data is passed on to the service called by the next Service call filter and so on.

Filter settings

Service type	Static field that you cannot edit. It always displays Generic to indicate that Generic is the Request type that must be selected in the Service Request connector through which the service is exposed.
Service name	The name of the service to call. This name is defined as Service name in the Service Request connector through which the service is exposed.
Timeout	Timeout (milliseconds) for the service call, i.e. the time to wait for the response before the service call expires. Specify -1 for no timeout, and wait as long as it takes for the response.
Service version	The version of the service (StreamServer application) to call. Specify 0 to always use the latest version.
Custom header	Custom HTTP header that can be submitted to the service. The header contains key-value pairs of the format Key: Value. Separate the pairs with <0D><0A> (hex values for carriage return + newline). Values in the header can be accessed with the GetConnectorValue script function.