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I trying to get page (HTML), read special token from it (it's different each time), and then send POST request, but that give me java.lang.IllegalStateException: connect in progress

    final URL url = new URL("<...>");
    String token = null;
    final HttpURLConnection con = (HttpURLConnection) url.openConnection();
    try (final InputStreamReader isr = new InputStreamReader(con.getInputStream())) {
        try (final BufferedReader in = new BufferedReader(isr)) {
            String str;
            while ((str = in.readLine()) != null) {
                if (str.contains("__token")) {
                    token = str.replace("<...>", "").replace("<...>", "");
                    System.out.println(token);
                    break;
            in.close();
        isr.close();
    con.setRequestMethod("POST");
    con.setRequestProperty("User-Agent", USER_AGENT);
    con.setDoOutput(true);
    try (final DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
        final String params = getParams("par1", "par2", token);
        wr.writeBytes(params);
        wr.flush(); wr.close();
        final int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + params);
        System.out.println("Response Code : " + responseCode);
        try (final BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
            String inputLine;
            final StringBuilder response = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            in.close();
            System.out.println(response.toString());
And this same if I try get this token from cookie:
final String token=con.getHeaderField("Set-Cookie").replace("__Token=", "").replace("; path=/; HttpOnly", "");
How to do that properly?
  
Each HttpURLConnection instance is used to make a single request but
  the underlying network connection to the HTTP server may be
  transparently shared by other instances.
This means that you cannot create a new (POST) request on the same HttpURLConnection object. And indeed, you get an IllegalStateException from it.
So you should remove the final modifier from the definition of con, and then, after finishing with the processing of the output of the original (GET) request, create another connection:
con = (HttpURLConnection) url.openConnection();
Only then, you can continue with constructing your POST request.
A little note: you use try-with-resources, so you don't need to explicitly close your streams. Also, you don't need two try blocks. In fact, you don't need to keep a reference to the InputStreamReader, as BufferedReader.close() also closes the underlying Reader, which also closes the underlying InputStream.
                ok, thanks, about note: I added that code to be sure that this error isn't about open streams.
– GotoFinal
                Dec 19, 2014 at 19:08
        
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