我是从Android 4.0的使用靶向REST Web服务 HttpsURLConnection 。这工作得很好，除非我尝试 POST 的东西。这是相关的code部分：

  connection.setDoOutput（真正的）;
   connection.setChunkedStreamingMode（0）;

   ByteArrayOutputStream OUT =新ByteArrayOutputStream（）;
   serializeObjectToStream（满分，对象）;
   byte []数组= out.toByteArray（）;
   。connection.getOutputStream（）写（阵列，0，array.length）;
 

这将引发以下异常：

  java.net.Htt pretryException：无法重试流HTTP主体
 

从调试，我意识到，输出流我通过获得connection.getOuputStream（）的类型是 ChunkedOutputStream 和从挖掘机器人源$ C ​​$ C我计算过，如果一个请求需要重试（无论何种原因），它与上面的异常戳的，因为它的数字，它的没有的使用 RetryableOutputStream ，它希望在那里。

现在的问题是：如何让我的HttpsURLConnection返回这样一个RetryableOutputStream，或者说，我怎么能prevent分块请求编码是否正确？我的认为的我这样做已经有 setChunkedStreamingMode（0），但显然这是不是这样的...

没有， java.net.HttpURLConnection中的实施忽略了0流模式或更低的：

 公共无效setChunkedStreamingMode（INT chunkLength）{
    [...]
    如果（chunkLength＆所述; = 0）{
        this.chunkLength = HttpEngine.DEFAULT_CHUNK_LENGTH;
    } 其他 {
        this.chunkLength = chunkLength;
    }
}
 

解决方案

坏消息！解决的办法是不叫 setChunkedStreamingMode（）（甚至 setFixedStreamingMode（））从客户端code处所有！ -1是定长和chunkedLength内部缺省值，并不能设置客户端，因为设置的值低于或等于0，让它默认为 HttpEngine.DEFAULT_CHUNK_LENGTH （或抛出在固定流模式的情况下除外）。

I'm targeting a REST web service from Android 4.0 using HttpsURLConnection. This works fine unless I try to POST something. This is the relevant code section:

   connection.setDoOutput(true);
   connection.setChunkedStreamingMode(0);

   ByteArrayOutputStream out = new ByteArrayOutputStream();
   serializeObjectToStream(out, object);
   byte[] array = out.toByteArray();
   connection.getOutputStream().write(array, 0, array.length);

This throws the following exception:

   java.net.HttpRetryException: Cannot retry streamed HTTP body

From debugging I realized that the output stream I get via connection.getOuputStream() is of type ChunkedOutputStream and from digging in Androids source code I figured that if a request needs to be retried (for whatever reason), it pokes with the above exception, because it figures out that it is not using a RetryableOutputStream that it wants there.

The question is now: How do I make my HttpsURLConnection return such a RetryableOutputStream, or rather, how can I prevent chunked request encoding properly? I thought I did that already with setChunkedStreamingMode(0), but apparently this is not the case...

[edit]

No, the implementation of java.net.HTTPUrlConnection ignores a streaming mode of 0 or lower:

 public void setChunkedStreamingMode(int chunkLength) {
    [...]
    if (chunkLength <= 0) {
        this.chunkLength = HttpEngine.DEFAULT_CHUNK_LENGTH;
    } else {
        this.chunkLength = chunkLength;
    }
}

Bummer! The solution is to not call setChunkedStreamingMode() (or even setFixedStreamingMode()) from the client code at all! "-1" are the internal default values for fixedLength and chunkedLength and cannot be set client-side, because setting a value lower or equal to "0" lets it default to HttpEngine.DEFAULT_CHUNK_LENGTH (or throws an exception in the fixed streaming mode case).