i pass data in HttpURLConnection outputstream but HttpServletrequest inputstream is empty - servlets

Question

Here is client code
public static void uploadFiles() {
try (DirectoryStream<Path> ds = Files.newDirectoryStream(Paths.get(Parameter.UPLOAD_FILES_DIR), "{*.dat}")) {
for (Path path : ds) {
System.out.println(path);
URL url = new URL(Parameter.UPLOAD_URL);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
conn.setConnectTimeout(1000 * 20);
conn.setReadTimeout(1000 * 20);
send(conn, path);
receive(conn);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void send(HttpURLConnection conn, Path path) throws Exception {
try (
BufferedOutputStream out = new BufferedOutputStream(conn.getOutputStream());
BufferedInputStream in = new BufferedInputStream(new FileInputStream(path.toFile()))
) {
byte[] buffer = new byte[1024];
int c = 0;
while ((c = in.read(buffer)) != -1) {
out.write(buffer, 0, c);
}
out.flush();
}
}
public static void receive(HttpURLConnection conn) throws Exception {
try (BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {
String str;
while ((str = in.readLine()) != null) {
System.out.println(str);
}
if (HttpURLConnection.HTTP_OK != conn.getResponseCode()) {
throw new Exception("Uploader response code: " + conn.getResponseCode());
}
}
}
Here is Servlet code:
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Post request");
System.out.println(request.getContentLength());
try (BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
) {
String str;
while ((str = br.readLine()) != null) {
System.out.print(str);
}
} catch (Exception ex) {
ex.printStackTrace();
}
try (BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(response.getOutputStream()))) {
bw.write("Close connection!!!");
}
}
When i run client code in server console out appears
Post refquest
-1
request.getContentLength() always return -1
Why i cant send bytes to the servlet? Here is contains of file which bytes i am trying to send
["192","2","3","4","5","6","7","8","9","US"] ["194","2","3","4","5","6","7","8","9","US"]

Answer 1

Resovled. Problem was in "/" symbol in the end of url. it was absent. But in this case servlet has responded.