Add handlers to the interface method parameters and headers before generating the HttpRequestMessage

[scrapstation]

I have an API request model like

Body:
{ userId:10001, amont:10, sign:"xxxxxx" }

When I write the business logic, I don't care about the generation of the sign field

Describe the solution you'd like

Provide a handler that performs a second processing of the parameters and headers before generating the httprequest

Describe alternatives you've considered

I can only use HttpMessageHandler to deserialize the request and process the sign parameter

Describe suggestions on how to achieve the feature

Additional context