Package org.eclipse.jetty.server

Interface Request.Handler

All Superinterfaces:
Invocable
All Known Subinterfaces:
Handler, Handler.Collection, Handler.Container, Handler.Singleton, HandlerContainer
All Known Implementing Classes:
AbstractHandler, AbstractHandlerContainer, BufferedResponseHandler, ConditionalHandler, ConditionalHandler.Abstract, ConditionalHandler.DontHandle, ConditionalHandler.ElseNext, ConditionalHandler.Reject, ConditionalHandler.SkipNext, ConnectHandler, ConstraintSecurityHandler, ContextHandler, ContextHandlerCollection, CrossOriginHandler, DebugHandler, DefaultHandler, DelayedHandler, EagerFormHandler, ErrorHandler, ErrorHandler, ErrorPageErrorHandler, EventsHandler, FastCGIProxyHandler, GracefulHandler, GzipHandler, Handler.Abstract, Handler.Abstract.NonBlocking, Handler.AbstractContainer, Handler.Sequence, Handler.Wrapper, HotSwapHandler, HttpSpiContextHandler, IdleTimeoutHandler, InetAccessHandler, LatencyRecordingHandler, MovedContextHandler, PathMappingsHandler, ProxyHandler, ProxyHandler.Forward, ProxyHandler.Reverse, QoSHandler, ReHandlingErrorHandler, ReHandlingErrorHandler.ByHttpStatus, ResourceHandler, ResourceHandler.ResourceContext, RewriteHandler, SecuredRedirectHandler, SecurityHandler, SecurityHandler.PathMapped, Server, ServerWebSocketContainer, ServletContextHandler, ServletHandler, SessionHandler, SessionHandler, ShutdownHandler, SizeLimitHandler, StateTrackingHandler, StatisticsHandler, StatisticsHandler.MinimumDataRateHandler, ThreadLimitHandler, TryPathsHandler, WebAppContext, WebSocketUpgradeHandler, WebSocketUpgradeHandler
Enclosing interface:
Request
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@ManagedObject @FunctionalInterface public static interface Request.Handler extends Invocable

A handler for an HTTP request and response.

The handling typically involves reading the request content (if any) and producing a response.

  • Method Details

    • handle

      boolean handle(Request request, Response response, Callback callback) throws Exception

      Invoked to handle the passed HTTP request and response.

      The request is accepted by returning true, then handling must be concluded by completing the passed callback. The handling may be asynchronous, i.e. this method may return true and complete the given callback later, possibly from a different thread. If this method returns false, then the callback must not be invoked and any mutation on the response reversed.

      Exceptions thrown by this method may be subsequently handled by an error Request.Handler, if present, otherwise a default HTTP 500 error is generated and the callback completed while writing the error response.

      The simplest implementation is:

       public boolean handle(Request request, Response response, Callback callback)
 {
     callback.succeeded();
     return true;
 }

      A HelloWorld implementation is:

       public boolean handle(Request request, Response response, Callback callback)
 {
     response.write(true, ByteBuffer.wrap("Hello World\n".getBytes(StandardCharsets.UTF_8)), callback);
     return true;
 }
      Parameters:
      request - the HTTP request to handle
      response - the HTTP response to handle
      callback - the callback to complete when the handling is complete
      Returns:
      True if and only if the request will be handled, a response generated and the callback eventually called. This may occur within the scope of the call to this method, or asynchronously some time later. If false is returned, then this method must not generate a response, nor complete the callback.
      Throws:
      Exception - if there is a failure during the handling. Catchers cannot assume that the callback will be called and thus should attempt to complete the request as if a false had been returned.
      See Also:

    • getInvocationType

      @ManagedAttribute("The InvocationType of this Handler") default Invocable.InvocationType getInvocationType()
      Specified by:
      getInvocationType in interface Invocable
      Returns:
      The InvocationType of this object