The 'Call Internal Service' filter is a filter which is designed to hook a servlet application (static files or policies) with a top policy. To see this filter in action, you can load the Admin Node Manager configuration in the policy studio. The point in this filter is to use a 'loopback' message which is directly processed by the listener. Upon return, the loop back circuit path is then copied into the current message.
In our case we implement a loopback 'like' functionality:
- A request is received on a special prefixed path (Ex : '/prefix/api/...'),
- The prefix is removed and is saved in a HTTP header, then the request URI is modified without the prefix (Ex: '/api/...'),
- The request is then routed to the API Manager for further processing (using a Connect to URL).
The goal is to avoid Connect to URL to improve performance and scalability. Attached to this document you've got a script which take the current 'http.request.uri' to execute a loopback request.
This artefact was successfully tested for the following versions:
- V7.4.1
• Modify 'http.request.uri' using standard 'Rewrite URL' filter
• Eventually, modify http verb/body and headers
• Call the loopback script
This script SHOULD NOT be used more than once for a given message
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Axway Team