Type Parameters:
T - the type of the handler function to filter
R - the type of the response of the function
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface HandlerFilterFunction<T extends ServerResponse,R extends ServerResponse>
```
Represents a function that filters a handler function.
Since:
5.2
Author:
Arjen Poutsma
See Also:
RouterFunction.filter(HandlerFilterFunction)

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default HandlerFilterFunction<T,R>`	`andThen(HandlerFilterFunction<T,T> after)`	Return a composed filter function that first applies this filter, and then applies the `after` filter.
`default HandlerFunction<R>`	`apply(HandlerFunction<T> handler)`	Apply this filter to the given handler function, resulting in a filtered handler function.
`R`	`filter(ServerRequest request, HandlerFunction<T> next)`	Apply this filter to the given handler function.
`static <T extends ServerResponse> HandlerFilterFunction<T,T>`	`ofErrorHandler(Predicate<Throwable> predicate, BiFunction<Throwable,ServerRequest,T> errorHandler)`	Adapt the given predicate and response provider function to a filter function that returns a `ServerResponse` on a given exception.
`static <T extends ServerResponse> HandlerFilterFunction<T,T>`	`ofRequestProcessor(Function<ServerRequest,ServerRequest> requestProcessor)`	Adapt the given request processor function to a filter function that only operates on the `ServerRequest`.
`static <T extends ServerResponse,R extends ServerResponse> HandlerFilterFunction<T,R>`	`ofResponseProcessor(BiFunction<ServerRequest,T,R> responseProcessor)`	Adapt the given response processor function to a filter function that only operates on the `ServerResponse`.

- Method Detail
  - filter
```
R filter(ServerRequest request,
         HandlerFunction<T> next)
  throws Exception
```
    Apply this filter to the given handler function. The given handler function represents the next entity in the chain, and can be invoked in order to proceed to this entity, or not invoked to block the chain.
    Parameters:
    request - the request
    next - the next handler or filter function in the chain
    Returns:
    the filtered response
    Throws:
    Exception
  - andThen
```
default HandlerFilterFunction<T,R> andThen(HandlerFilterFunction<T,T> after)
```
    Return a composed filter function that first applies this filter, and then applies the after filter.
    Parameters:
    after - the filter to apply after this filter is applied
    Returns:
    a composed filter that first applies this function and then applies the after function
  - apply
```
default HandlerFunction<R> apply(HandlerFunction<T> handler)
```
    Apply this filter to the given handler function, resulting in a filtered handler function.
    Parameters:
    handler - the handler function to filter
    Returns:
    the filtered handler function
  - ofRequestProcessor
```
static <T extends ServerResponse> HandlerFilterFunction<T,T> ofRequestProcessor(Function<ServerRequest,ServerRequest> requestProcessor)
```
    Adapt the given request processor function to a filter function that only operates on the ServerRequest.
    Parameters:
    requestProcessor - the request processor
    Returns:
    the filter adaptation of the request processor
  - ofResponseProcessor
```
static <T extends ServerResponse,R extends ServerResponse> HandlerFilterFunction<T,R> ofResponseProcessor(BiFunction<ServerRequest,T,R> responseProcessor)
```
    Adapt the given response processor function to a filter function that only operates on the ServerResponse.
    Parameters:
    responseProcessor - the response processor
    Returns:
    the filter adaptation of the request processor
  - ofErrorHandler
```
static <T extends ServerResponse> HandlerFilterFunction<T,T> ofErrorHandler(Predicate<Throwable> predicate,
                                                                                  BiFunction<Throwable,ServerRequest,T> errorHandler)
```
    Adapt the given predicate and response provider function to a filter function that returns a ServerResponse on a given exception.
    Parameters:
    predicate - the predicate to match an exception
    errorHandler - the response provider
    Returns:
    the filter adaption of the error handler

Interface HandlerFilterFunction<T extends ServerResponse,​R extends ServerResponse>

Method Summary

Method Detail

filter

andThen

apply

ofRequestProcessor

ofResponseProcessor

ofErrorHandler

Interface HandlerFilterFunction<T extends ServerResponse,R extends ServerResponse>