2.7.0版本getContextPath方法：
```
protected String getContextPath(URL url) {
        String contextPath = url.getPath();
        return contextPath.endsWith("/") ? contextPath.substring(0,contextPath.length()-1) : contextPath;
    }
```
无法将方法置入web容器中，退回2.6.5版本的方法：
```
protected String getContextPath(URL url) {
        int pos = url.getPath().lastIndexOf("/");
        return pos > 0 ? url.getPath().substring(0, pos) : "";
    }
```
使用正常，两个方法应该不等价的。
import org.apache.dubbo.config.mock.MockRegistryFactory2;
import org.apache.dubbo.config.mock.TestProxyFactory;
import org.apache.dubbo.config.provider.impl.DemoServiceImpl;
import org.apache.dubbo.registry.Registry;
import org.apache.dubbo.rpc.Exporter;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Protocol;
import org.apache.dubbo.rpc.service.GenericService;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
import static org.apache.dubbo.common.Constants.GENERIC_SERIALIZATION_BEAN;
import static org.apache.dubbo.common.Constants.GENERIC_SERIALIZATION_DEFAULT;
import static org.apache.dubbo.common.Constants.GENERIC_SERIALIZATION_NATIVE_JAVA;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasEntry;
import static org.hamcrest.Matchers.hasKey;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.withSettings;
public class ServiceConfigTest {