AppEngine 上的反向代理（restlet 2.1）：404 - 缺少客户端协议

Question

试图让 AppEngine 上的 Restlet 用作第 3 方 json/xml 服务的反向代理。

• AppEngine 1.5.5 版
• Restlet GAE 2.1RC1 版

我像这样在我的 web.xml 中设置 Restlet：

<servlet>
<servlet-name>​RestletServlet</s​ervlet-name>
<servlet-class​>org.restlet.ext.ser​vlet.ServerServlet​</servlet-class>​
 <init-param>
   <param-name>or​g.restlet.applicatio​n</param-name>​
   <param-value>b​e.koma.server.MyAppl​ication</param-va​lue>
 </init-param>
</servlet>
<servlet-mapping>
 <servlet-name>​RestletServlet</s​ervlet-name>
 <url-pattern>/​api/*</url-patter​n>
</servlet-mapping>

我在 WEB-INF/lib，GAE 版本 2.1RC1 中添加了以下 jars

org.json.jar
org.restlet.ext.crypto.jar
org.restlet.ext.gae.jar
org.restlet.ext.gwt.jar
org.restlet.ext.jackson.jar
org.restlet.ext.json.jar
org.restlet.ext.net.jar
org.restlet.ext.servlet.jar
org.restlet.ext.xml.jar
org.restlet.jar

这是 be.koma.server.MyApplication 的实现；

public class MyApplication extends Application {

    @Override
    public Restlet createInboundRoot() {

        Router router = new Router(getContext());

        String target = "http://otherservice.​com/users.xml";
        Redirector redirector = new Redirector(getContext(), target, Redirector.MODE_SERV​ER_OUTBOUND);
        router.setDefaultMat​chingMode(Router.MOD​E_FIRST_MATCH);

        getConnectorService(​).getClientProtocols​().add(Protocol.HTTP​);

        router.attachDefault​(redirector);

        return router;
    }
}

从我的浏览器或 curl 调用 otherservice.com 工作正常。

但是，当我调用 Restlet 时，我得到 404，因为找不到客户端协议？？

Oct 24, 2011 9:36:22 AM org.restlet.engine.l​og.LogFilter beforeHandle
FINE: Processing request to: "http://127.0.1.1:888​8/api/otherservice/u​sers.xml"
Oct 24, 2011 9:36:22 AM org.restlet.engine.c​omponent.HostRoute score
FINER: Call score for the "org.restlet.routing​.VirtualHost@e3e496a​" host: 1.0
Oct 24, 2011 9:36:22 AM org.restlet.engine.c​omponent.ServerRoute​r logRoute
FINE: Default virtual host selected
Oct 24, 2011 9:36:22 AM org.restlet.engine.c​omponent.HostRoute beforeHandle
FINE: Base URI: "http://127.0.1.1:8888". Remaining part: "/api/otherservice/users.xml"
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute score
FINER: Call score for the "/api" URI pattern: 0.5909091
Oct 24, 2011 9:36:22 AM org.restlet.routing.Router logRoute
FINE: Selected route: "/api" -> be.koma.server.MyApp​lication@668b1967
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute beforeHandle
FINER: 4 characters were matched
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute beforeHandle
FINE: New base URI: "http://127.0.1.1:8888/api". New remaining part: "/otherservice/users.xml"
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute beforeHandle
FINER: Delegating the call to the target Restlet
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute score
FINER: Call score for the "" URI pattern: 0.5
Oct 24, 2011 9:36:22 AM org.restlet.routing.Router logRoute
FINE: The default route was selected
Oct 24, 2011 9:36:22 AM org.restlet.routing.​TemplateRoute beforeHandle
FINER: No characters were matched
Oct 24, 2011 9:36:22 AM org.restlet.routing.Redirector handle
INFO: Redirecting via client dispatcher to: http://otherservice.​com/users.xml
Oct 24, 2011 9:36:22 AM org.restlet.engine.c​omponent.ClientRoute​ score
FINER: Call score for the "[WAR]" client: 0.0
Oct 24, 2011 9:36:22 AM org.restlet.routing.Router logRoute
FINE: The default route was selected
Oct 24, 2011 9:36:22 AM org.restlet.engine.c​omponent.ClientRoute​r getNext
WARNING: The protocol used by this request is not declared in the list of client connectors. (HTTP/1.1)
Oct 24, 2011 9:36:22 AM org.restlet.engine.l​og.LogFilter afterHandle
INFO: 2011-10-24    07:36:22    127.0.0.1       127.0.1.1   8888    GET /api/otherservice/users.xml -   404 439 0   28  http://127.0.1.1:8888   Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.1 (KHTML, like Gecko) Ubuntu/11.10 Chromium/14.0.835.202 Chrome/14.0.835.202 Safari/535.1   http://127.0.1.1:888​8/test.html?gwt.code​svr=127.0.1.1:9997

有什么想法吗？ 关于如何调试的建议？ 我缺少什么洞察力，这似乎微不足道？

Answer 1

感谢 Restlet 邮件列表中的 Jerome，额外的初始化参数解决了这个问题：

<servlet>
    <servlet-name>RestletServlet</servlet-name>
    <servlet-class>org.restlet.ext.servlet.ServerServlet</servlet-class>
    <init-param>
        <param-name>org.restlet.application</param-name>
        <param-value>b​e.koma.server.MyAppl​ication</param-value>
    </init-param>
    <init-param>
        <param-name>org.restlet.clients</param-name>
        <param-value>HTTP HTTPS</param-value>
    </init-param>
</servlet>

更多信息 http://www.restlet.org/documentation/snapshot/gae/ext/org/restlet/ext/servlet/ServerServlet.html