use default value when the specified timeout is 0s

staging/src/k8s.io/apiserver/pkg/endpoints/filters/request_deadline.go

@@ -69,7 +69,10 @@ func WithRequestDeadline(handler http.Handler, longRunning request.LongRunningRe
 				return
 			}
 
-			timeout = userSpecifiedTimeout
+			// if the user has specified a timeout of 0s, this means no timeout, so we should use the maximum timeout allowed.
+			if userSpecifiedTimeout != 0 {
+				timeout = userSpecifiedTimeout
+			}
 		}
 
 		ctx, cancel := context.WithTimeout(ctx, timeout)

staging/src/k8s.io/apiserver/pkg/endpoints/filters/request_deadline_test.go

@@ -94,6 +94,15 @@ func TestWithRequestDeadline(t *testing.T) {
 			deadlineExpected:         14 * time.Second, // to account for the delay in verification
 			statusCodeExpected:       http.StatusOK,
 		},
+		{
+			name:                     "the specified timeout is 0s, default deadline is expected to be set",
+			requestURL:               "/api/v1/namespaces?timeout=0s",
+			longRunning:              false,
+			handlerCallCountExpected: 1,
+			hasDeadlineExpected:      true,
+			deadlineExpected:         requestTimeoutMaximum - time.Second, // to account for the delay in verification
+			statusCodeExpected:       http.StatusOK,
+		},
 		{
 			name:                     "the user does not specify any request timeout, default deadline is expected to be set",
 			requestURL:               "/api/v1/namespaces?timeout=",