// If the backend is unreachable, the optional ErrorHandler is
	// called without any call to ModifyResponse.
	//
	// If ModifyResponse returns an error, ErrorHandler is called
	// with its error value. If ErrorHandler is nil, its default
	// implementation is used.
	ModifyResponse func(*http.Response) error

	// ErrorHandler is an optional function that handles errors

		panic("test")
	}()
	if result != "test" {
		t.Errorf("did not receive custom handler")
	}
}

func TestCustomHandleError(t *testing.T) {
	old := ErrorHandlers
	defer func() { ErrorHandlers = old }()
	var result error
	ErrorHandlers = []ErrorHandler{
		func(_ context.Context, err error, msg string, keysAndValues ...interface{}) {
			result = err
		},
	}
	err := fmt.Errorf("test")
	HandleError(err)

	})
	writeJSON(w, configs, req)
}

// SidecarScope debugging
func (s *DiscoveryServer) sidecarz(w http.ResponseWriter, req *http.Request) {
	proxyID, con := s.getDebugConnection(req)
	if con == nil {
		s.errorHandler(w, proxyID, con)
		return
	}
	writeJSON(w, con.proxy.SidecarScope, req)
}

// Resource debugging.
func (s *DiscoveryServer) resourcez(w http.ResponseWriter, req *http.Request) {

	}
}

// ErrorHandlers is a list of functions which will be invoked when a nonreturnable
// error occurs.
// TODO(lavalamp): for testability, this and the below HandleError function
// should be packaged up into a testable and reusable object.
var ErrorHandlers = []ErrorHandler{
	logError,
	func(_ context.Context, _ error, _ string, _ ...interface{}) {

    // a value of `configuration.getAttributes()`.
    // TODO:configuration-cache find a way to clean up this #23732
    private Provider<AttributeContainer> zConfigurationAttributes;
    private ResolutionErrorRenderer errorHandler;
    private String configurationName;
    private String configurationDescription;

    /**
     * The root component of the dependency graph to be inspected.
     *
     * @since 7.5
     */

		wantCode       int
		errorHandler   func(http.ResponseWriter, *http.Request, error)
		transport      http.RoundTripper // defaults to failingRoundTripper
		modifyResponse func(*http.Response) error
	}{
		{
			name:     "default",
			wantCode: http.StatusBadGateway,
		},
		{
			name:         "errorhandler",
			wantCode:     http.StatusTeapot,

	"go/token"
	"path/filepath"
	"strconv"
	"unicode"
	"unicode/utf8"
)

// An ErrorHandler may be provided to [Scanner.Init]. If a syntax error is
// encountered and a handler was installed, the handler is called with a
// position and an error message. The position points to the beginning of
// the offending token.
type ErrorHandler func(pos token.Position, msg string)

// A Scanner holds the scanner's internal state while processing

import java.util.concurrent.CountDownLatch
import java.util.concurrent.LinkedBlockingQueue

@Timeout(60)
class MessageHubIntegrationTest extends ConcurrentSpec {
    final Action<Throwable> errorHandler = Mock()

    def "can wire two hubs together"() {
        Dispatch<String> clientHandler = Mock()
        Dispatch<String> serverHandler = Mock()
        def server = new Participant()

			v.SetComplex(s.scanComplex(verb, v.Type().Bits()))
		default:
			s.errorString("can't scan type: " + val.Type().String())
		}
	}
}

// errorHandler turns local panics into error returns.
func errorHandler(errp *error) {
	if e := recover(); e != nil {
		if se, ok := e.(scanError); ok { // catch local error
			*errp = se.err

	// proxying the request to another node.
	for k := range w.Header() {
		w.Header().Del(k)
	}

	f := handlers.NewForwarder(&handlers.Forwarder{
		PassHost:     true,
		RoundTripper: ep.Transport,
		ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
			success = false
			if err != nil && !errors.Is(err, context.Canceled) {
				replLogIf(GlobalContext, err)
			}
		},
	})