How to define Response Filter Attribute for requests with void return type

ServiceStack
1

Hello,

I’ve implemented a session timeout sliding as ResponseFilterAttribute. After implementing a simple “keep alive” GET request that doesn’t return a value, I found out that the code in my attribute isn’t invoked.

A short investigation showed that if I add any data to response (I added a string), the response filter code is triggered.

Please, advise how can I define a response filter attribute for service methods that don’t return values.

Thank you

2

Empty/null responses aren’t executed in Response Filters. You can handle them by overriding OnAfterExecute() in your AppHost.

Also note GET’s (by HTTP Contract) should be idempotent and side-effect free, not returning anything is an indication that it’s not.

3

I’ve change the request to be POST request. It receives DTO without fields and returns void.
The effect is the same: Response Filter isn’t triggered.

4

I know which is why I said:

5

Sorry. I thought it is addressing only GET requests which are expected to return data.

It means that I can replace all void server API methods with returning string and return the empty string to enforce it invoking the response filter attribute, correct?

6

Yes returning anything will execute the response filters.