Merge pull request #2548 from ufec/master

Update exception-filters.md

Author: kamilmysliwiec

content/exception-filters.md

@@ -206,6 +206,8 @@ export class HttpExceptionFilter {
 
 > info **Hint** All exception filters should implement the generic `ExceptionFilter<T>` interface. This requires you to provide the `catch(exception: T, host: ArgumentsHost)` method with its indicated signature. `T` indicates the type of the exception.
 
+> warning **Warning** If you are using `@nestjs/platform-fastify` you can use `response.send()` instead of `response.json()`. Don't forget to import the correct types from `fastify`.
+
 The `@Catch(HttpException)` decorator binds the required metadata to the exception filter, telling Nest that this particular filter is looking for exceptions of type `HttpException` and nothing else. The `@Catch()` decorator may take a single parameter, or a comma-separated list. This lets you set up the filter for several types of exceptions at once.
 
 #### Arguments host