FieldsExtractor (gax-httpjson 0.104.0 API)

```
public interface FieldsExtractor<RequestT,ParamsT>
```
A functional interface to be implemented for each request message to extract specific fields from it. For advanced usage only.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  ParamsT extract(RequestT request)

- Method Detail
  - extract
```
ParamsT extract(RequestT request)
```