HTTP POST 400。不好的要求。Google云存储XML API调用上传文件

Question

我收到这个错误代码。

e/camera_classes.callHttpPostTosendFiles：异常消息e java.io.ioException:服务器返回非OK状态：400消息：Bad Request error stream:com.android.okhttp.internal.http.httpTransport$FixedLengThinputStream@42353798at camera_classes.postMultipartEntity.finish(postMultipartEntity.java:161)at camera_classes.callHttpPostTosEntity.java:193)at posttoSendfiles.java:105)在Android.os.asynctask$2.调用(asynctask.java:288)，java.util.concurrent.futuretask.run(Futuretask.java:237)在Android.os.asynctask$serialexecutor$1.run(futuretask.java:231)在java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)在

错误发生在

public List<String> finish() throws IOException {
        List<String> response = new ArrayList<String>();

        writer.append(LINE_FEED).flush();
        writer.append("--" + boundary + "--").append(LINE_FEED);
        writer.close();

        // checks server's status code first
        int status = httpConn.getResponseCode();
        String server_message = httpConn.getResponseMessage();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpConn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                response.add(line);
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status + " message: " + server_message + " error stream : " + httpConn.getErrorStream());
        }

1）我有兴趣获得关于这里列出的错误代码（400 Bad Request）的更多信息，这样我就可以理解是什么导致了“400 Bad Request”错误。有人能帮忙吗？我尝试了所有可用的公共方法--httpconn.getResponseMessage()、httpconn.getResponseCode()和httpconn.getErrorStream()。

2)com.android.okhttp.internal.http.httptransport$FixedLengThinputStream@42353798是什么意思？这是httpconn.geterrorStream()的输出。

Answer 1

我正在使用Google Cloud XML Api的上传方法，如下所示。关于您的第二个问题，可能与使用HttpUrlConnection中的setFixedLengthStreamingMode方法有关，就像我在函数中使用的那样，您必须将上传文件的长度：

URL url = new URL("www.urltoupload.com");

HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();

httpCon.setDoOutput(true);
httpCon.setRequestMethod("PUT");
httpCon.setRequestProperty("Content-Type", Utils.getMimeType(path));
httpCon.setRequestProperty("Connection", "Keep-Alive");
httpCon.setFixedLengthStreamingMode((int) dest.length());

final DataOutputStream out = new DataOutputStream(httpCon.getOutputStream());

float bytesTotal = fileBeingUploaded.length();

int bytesRead;
byte buf[] = new byte[8192];
BufferedInputStream bufInput = new BufferedInputStream(new FileInputStream(dest));

while ((bytesRead = bufInput.read(buf)) != -1) {
    out.write(buf, 0, bytesRead);
    out.flush();
}

out.close();