如何在Google endpoints响应中发送自定义标头

@ApiMethod(name = "exampleMethod", path = "example/path")
public MyResponse exampleMethod(MyRequest request) {
    // 处理请求并生成响应
    MyResponse response = new MyResponse();
    // 设置自定义标头
    response.setCustomHeader("Custom Value");
    return response;
}

public class MyResponse {
    private String customHeader;

    public String getCustomHeader() {
        return customHeader;
    }

    public void setCustomHeader(String customHeader) {
        this.customHeader = customHeader;
    }
}

@Api(name = "myApi", version = "v1")
public class MyEndpoint {
    @ApiMethod(name = "exampleMethod", path = "example/path")
    @ApiResponse(name = "customHeader", type = "string")
    public MyResponse exampleMethod(MyRequest request) {
        // 处理请求并生成响应
        MyResponse response = new MyResponse();
        // 设置自定义标头
        response.setCustomHeader("Custom Value");
        return response;
    }
}

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <threadsafe>true</threadsafe>
    <runtime>java8</runtime>
    <system-properties>
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
    </system-properties>
    <endpoints-api-configuration>endpoints-api-configuration.xml</endpoints-api-configuration>
</appengine-web-app>