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为异步FormUrlEncoded DELETE调用改进抛出IllegalArgumentException异常

我正在尝试创建一个异步POST和DELETE,这是使用Android 4.4中的Retrofit编码的url形式

这是我的客户 -

@FormUrlEncoded
@POST(INetwork.API_BASE_PREFIX + "/memberships.json")
void join(@Field("id") String id, Callback<?> cb);

@FormUrlEncoded
@DELETE(INetwork.API_BASE_PREFIX + "/memberships.json")
void leave(@Field("id") String id, Callback<?> cb);
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这是例外 -

java.lang.IllegalArgumentException: IRepositoryClient.leave: FormUrlEncoded can only be specified on HTTP methods with request body (e.g., @POST).
        at retrofit.RestMethodInfo.methodError(RestMethodInfo.java:118)
        at retrofit.RestMethodInfo.parseMethodAnnotations(RestMethodInfo.java:191)
        at retrofit.RestMethodInfo.init(RestMethodInfo.java:128)
        at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:329)
        at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:264)
        at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:315)
        at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
        at retrofit.Platform$Android$2$1.run(Platform.java:142)
        at java.lang.Thread.run(Thread.java:841)
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我查看了源代码,基本上如果方法没有正文并且请求是formurlencoded,则抛出此异常.另外我注意到FormUrlEncoded的所有例子都工作正常,因为它不是异步的,即我有某种类型的返回类型而且没有回调 - 抱歉我有点丢失

我应该送一个空身吗?我需要发送一个,而且@Field参数不够吗?

使用Retrofit 1.5.0

post android http-post http-delete retrofit

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