Java：发送POST HTTP请求以将文件上传到MediaFire REST API

Question

I need to send a HTTP POST request to the MediaFire REST API from a Java web app running in Google App Engine , in order to upload a file.

Please see upload function documentation here (few lines).

Looking at the documentation and some research, I've written the following Java code to make the correspondent request:

byte[] bytesData = //byte array with file data

URL url = new URL("http://www.mediafire.com/api/upload/upload.php?" +
                    "session_token=" + sessionToken);

//Configure connection
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setReadTimeout(60000);

//Set headers
conn.setRequestProperty("Content-Type", "application/octet-stream");
conn.setRequestProperty("x-filename", fileName);
conn.setRequestProperty("x-filesize", fileSize);
conn.setRequestProperty("x-filehash", sha256);

//Write binary data
System.out.println("\nWriting data...");
OutputStream out = conn.getOutputStream();
out.write(bytesData);
out.flush();

//Check connection
//if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
//  throw new RuntimeException("FAILED!!! HTTP error code: " + 
//                             conn.getResponseCode() + " --- " + 
//                             conn.getResponseMessage());
//}

//Get response
System.out.println("\nGetting response...");
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));

//Print response
System.out.println("\nOutput from Server .... \n");
String output;
while ((output = br.readLine()) != null) {
  System.out.println(output);
}

But I'm not getting any result, just:

Writing data...
Getting response...
Output from Server:

If I un-comment the lines under //Check connection I get an Exception :

java.lang.RuntimeException: FAILED!!! HTTP error code: 503 --- OK

If I change the Content-Type header for multipart/form-data I get a different Exception :

java.lang.RuntimeException: FAILED!!! HTTP error code: 400 --- OK

I don't know too much about HTTP connections and so on and I have no idea about what's happening...

Any ideas about what may be going on?

---

Note : I'm using other (GET) methods of the API from the same app and they are working perfectly.

Answer 1

HTTP错误代码：400是错误请求的状态代码，这可能意味着服务器除了multipart / form-data以外，503代码意味着服务器超载，因此该服务可能托管在服务器上的其他服务器/线程上其他GET方法，可能会收到更多流量。