To enable preemptive authentication simply configure your repository to explicitly use the link:{javadocPath}/org/gradle/authentication/http/BasicAuthentication.html[BasicAuthentication] scheme:

.Configure repository to use preemptive authentication
====
include::sample[dir="snippets/artifacts/defineRepository/kotlin",files="build.gradle.kts[tags=preemptive-authentication]"]

	return f.Ignorable
}

// SupportsPreemption returns true indicating the extender supports preemption.
func (f *FakeExtender) SupportsPreemption() bool {
	// Assume preempt verb is always defined.
	return true
}

// ProcessPreemption implements the extender preempt function.
func (f *FakeExtender) ProcessPreemption(
	pod *v1.Pod,
	nodeNameToVictims map[string]*extenderv1.Victims,
	nodeInfos framework.NodeInfoLister,

	// Verb for the filter call, empty if not supported. This verb is appended to the URLPrefix when issuing the filter call to extender.
	FilterVerb string
	// Verb for the preempt call, empty if not supported. This verb is appended to the URLPrefix when issuing the preempt call to extender.
	PreemptVerb string
	// Verb for the prioritize call, empty if not supported. This verb is appended to the URLPrefix when issuing the prioritize call to extender.

				semawakeup(mp)
				break
			}
		}
	}
	gp.m.mLockProfile.recordUnlock(l)
	gp.m.locks--
	if gp.m.locks < 0 {
		throw("runtime·unlock: lock count")
	}
	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
		gp.stackguard0 = stackPreempt
	}
}

// One-time notifications.
func noteclear(n *note) {
	n.key = 0
}

	traceBlockGCMarkAssist:    "GC mark assist wait for work",
	traceBlockGCSweep:         "GC background sweeper wait",
	traceBlockSystemGoroutine: "system goroutine wait",
	traceBlockPreempted:       "preempted",
	traceBlockDebugCall:       "wait for debug call",
	traceBlockUntilGCEnds:     "wait until GC ends",
	traceBlockSleep:           "sleep",
}

                response.setStatus(200)
            }
        })

        expect:
        cache.store(key, writer("".bytes))
    }

    def "does preemptive authentication"() {
        config.credentials.username = 'user'
        config.credentials.password = 'password'

        server.authenticationScheme = AuthScheme.BASIC

	// injection test code fire, because it runs in a signal handler
	// and may not have a P.
	//
	// We use 8 Ps so there's room for the debug call worker,
	// something that's trying to preempt the call worker, and the
	// goroutine that's trying to stop the call worker.
	ogomaxprocs := runtime.GOMAXPROCS(8)
	ogcpercent := debug.SetGCPercent(-1)
	runtime.GC()

	{"net.inet.ah.enable", []_C_int{4, 2, 51, 1}},
	{"net.inet.ah.stats", []_C_int{4, 2, 51, 2}},
	{"net.inet.carp.allow", []_C_int{4, 2, 112, 1}},
	{"net.inet.carp.log", []_C_int{4, 2, 112, 3}},
	{"net.inet.carp.preempt", []_C_int{4, 2, 112, 2}},
	{"net.inet.carp.stats", []_C_int{4, 2, 112, 4}},
	{"net.inet.divert.recvspace", []_C_int{4, 2, 258, 1}},
	{"net.inet.divert.sendspace", []_C_int{4, 2, 258, 2}},

	{"net.inet.ah.enable", []_C_int{4, 2, 51, 1}},
	{"net.inet.ah.stats", []_C_int{4, 2, 51, 2}},
	{"net.inet.carp.allow", []_C_int{4, 2, 112, 1}},
	{"net.inet.carp.log", []_C_int{4, 2, 112, 3}},
	{"net.inet.carp.preempt", []_C_int{4, 2, 112, 2}},
	{"net.inet.carp.stats", []_C_int{4, 2, 112, 4}},
	{"net.inet.divert.recvspace", []_C_int{4, 2, 258, 1}},
	{"net.inet.divert.sendspace", []_C_int{4, 2, 258, 2}},

String id=12
	data="chan receive"
String id=13
	data="GC mark assist wait for work"
String id=14
	data="GC background sweeper wait"
String id=15
	data="system goroutine wait"
String id=16
	data="preempted"
String id=17
	data="wait for debug call"
String id=18
	data="wait until GC ends"
String id=19
	data="sleep"
String id=20
	data="runtime.Gosched"
String id=21
	data="start trace"