com.vaadin.flow.server.RequestHandler API 13.0.13 | Vaadin

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com.vaadin.flow.server.

All Superinterfaces:

Serializable

All Known Subinterfaces:

SessionExpiredHandler

All Known Implementing Classes:

BootstrapHandler, FaviconHandler, HeartbeatHandler, PushRequestHandler, PwaHandler, SessionRequestHandler, StreamRequestHandler, SynchronizedRequestHandler, UidlRequestHandler, UnsupportedBrowserHandler
```
public interface RequestHandler
extends Serializable
```
Handler for producing a response to HTTP requests. Handlers can be either added on a service level, common for all users, or on a session level for only a single user.

Method Summary

All Methods
Modifier and Type	Method and Description
`boolean`	`handleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response)` Called when a request needs to be handled.

- Method Detail
  - handleRequest
```
boolean handleRequest(VaadinSession session,
                      VaadinRequest request,
                      VaadinResponse response)
               throws IOException
```
    Called when a request needs to be handled. If a response is written, this method should return true to indicate that no more request handlers should be invoked for the request.
    Note that request handlers by default do not lock the session. If you are using VaadinSession or anything inside the VaadinSession you must ensure the session is locked. This can be done by extending SynchronizedRequestHandler or by using VaadinSession.accessSynchronously(Command) or UI.accessSynchronously(Command).
    
    Parameters:
    
    session - The session for the request
    
    request - The request to handle
    
    response - The response object to which a response can be written.
    
    Returns:
    
    true if a response has been written and no further request handlers should be called, otherwise false
    
    Throws:
    
    IOException - If an IO error occurred