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。
public void setProviderIds(String providerIds) {
        this.providerIds = providerIds;
    }
    public String getGeneric() {
        return generic;
    }
    public void setGeneric(String generic) {
        if (StringUtils.isEmpty(generic)) {
            return;
        }
        if (ProtocolUtils.isGeneric(generic)) {
            this.generic = generic;
        } else {
            throw new IllegalArgumentException("Unsupported generic type " + generic);
        }
    }
    @Override
    public void setMock(Boolean mock) {
        throw new IllegalArgumentException("mock doesn't support on provider side");
    }
    @Override
    public void setMock(String mock) {
        throw new IllegalArgumentException("mock doesn't support on provider side");
    }
    public List<URL> getExportedUrls() {
        return urls;
    }
    /**
     * @deprecated Replace to getProtocols()
     */