----- Original Message -----
From: "Endre Stølsvik" <[EMAIL PROTECTED]>
To: "Remy Maucherat" <[EMAIL PROTECTED]>; "Tomcat Users List"
<[EMAIL PROTECTED]>
Sent: Tuesday, November 13, 2001 5:01 PM
Subject: Re: [TC4] Sending redirect fails if OutputStream isn't closed ..
> On Mon, 12 Nov 2001, Remy Maucherat wrote:
>
> | > I'm using this program called "loadsim" to get a simulation of a bunch
of
> | > users using my webapp. This is a java program utilizing the
> | > java.net.HttpConnection to simulate the clients, built using large
parts
> | > of a apache loadsimulation system, right?
>
> Make that "java.net.HttpURLConnection" (as the client).
>
> | > Why is that? Why do I have to get the outputstream, and then just
close it
> | > to get the sendRedirect away? Why isn't the stream closed on exit of
the
> | > doGet/Post method? Or whatever?
> |
> | The default servlet doesn't use the output stream at all, and appears to
> | behave correctly (verified using a telnet session). This looks like a
> | problem with the HTTP client you're using.
>
> I also mentioned this in the first post (Mozilla behaves properly), but
> why does it then work when I get and close the output stream as described?
>
> Here's the code from "loadsim" that does the sampling, just if you don't
> have much other to do today! (It's not that long, actually)..
>
> It seems to close both its output to the server, and the input from the
> server..
> Extra-info: that page which sends the redirects is just a "poster-page";
> this is where the browser does GETs with parameters and POSTs: it just
> takes all the parameters from the browser, and then sends a "blank"
> redirect to the browser. This fools the (most) browsers to not store this
> as a separate history event, and you don't get that reposting stuff on
> "back" and "reload" going.
>
> --------------------------
>
> /**
> * Send the link to the webserver using the <code>VirtualUser</code>'s
> * <code>CookieManager</code>.
> *
> * @param cookieManager The <code>VirtualUser</code>'s
> <code>CookieManager</code>.
> * @param log The log file to log information/errors to.
> *
> * @return The <code>SampleResult</code> object.
> *
> * @exception IOException if an error occurs reading from or writing
> to the
> * webserver.
> */
> public SampleResult sample(CookieManager cookieManager, ILog log)
> throws IOException {
> long then;
> URL url = null;
> HttpURLConnection connection = null;
> BufferedInputStream input = null;
> SampleResult sample = null;
> byte [] buf = null;
> int bytesread = 0;
> ByteArrayOutputStream outbuf = null;
>
> // Init the sample result
>
> sample = new SampleResult();
> sample.setLabel(id_);
>
> // Create the HTTP connection
> then = System.currentTimeMillis();
>
> url = new URL(linkStr_);
> connection = (HttpURLConnection) url.openConnection();
> connection.setUseCaches(false);
> connection.setDoInput(true);
> connection.setInstanceFollowRedirects(false); // ***
> [EMAIL PROTECTED]: if followredirects is true we miss out on the cookies
> set by the first page!
>
> // Setup cookies
>
> if (cookieManager != null) {
> String cookieHeader =
> cookieManager.getCookieHeaderForURL(url);
> if (cookieHeader != null) {
> connection.setRequestProperty("Cookie", cookieHeader);
> }
> }
>
> if (formDataStr_ == null) {
> connection.connect();
> sample.setTTOpen(System.currentTimeMillis() - then);
> log.log(ILog.INFORMATION, "' url = " + linkStr_);
> } else {
> try {
> DataOutputStream output = null;
>
> connection.setRequestProperty("Content-Type",
> "application/x-www-form-urlencoded");
> connection.setDoOutput(true);
> connection.setRequestMethod("POST");
> connection.connect();
> sample.setTTOpen(System.currentTimeMillis() - then);
>
> output = new
> DataOutputStream(connection.getOutputStream());
> output.writeBytes(formDataStr_);
> output.flush();
> output.close();
> log.log(ILog.INFORMATION, "' url = " + linkStr_ + " POST =
> " + formDataStr_ + " (" +
> formDataStr_.length() + ")");
> } catch (Exception e) {
> log.log(ILog.ERROR, "Caught exception: " + e.getMessage()
> + " ignoring sample");
> sample.setTTLB(-1);
> sample.setTTFB(-1);
> sample.setSize(-1);
> sample.setLastPage(null);
> return sample;
> }
> }
>
> // this is where 'then = currentTime' used to be.
> sample.setTTReq(System.currentTimeMillis() - then);
>
> // Check for cookies coming back
>
> try {
> if (cookieManager != null) {
>
> // check for Set-Cookie headers from server (index 0 is
> the
> // HTTP repsonse code), which does not use "header: value"
> format
>
> for (int i = 1;; i++) {
> try {
> if
> (connection.getHeaderFieldKey(i).equals("Set-Cookie")) {
>
> cookieManager.addCookieFromHeader(connection.getHeaderField(i), url);
> }
> } catch (NullPointerException e) {
> break;
> }
> }
> }
>
> // Read the HTML from the webserver
>
> input = new BufferedInputStream(connection.getInputStream());
> buf = new byte[BUFF_SIZE];
> bytesread = input.read(buf);
> sample.setTTFB(System.currentTimeMillis() - then);
> outbuf = new ByteArrayOutputStream();
> while (bytesread != -1) {
> outbuf.write(buf, 0, bytesread);
> bytesread = input.read(buf);
> }
> input.close();
> sample.setTTLB(System.currentTimeMillis() - then);
> sample.setSize(outbuf.size());
> if (connection.getContentType() != null) {
> sample.setContentType(connection.getContentType());
> if
> (connection.getContentType().toLowerCase().startsWith("text/html")) {
> sample.setLastPage(outbuf.toString());
> } else {
> sample.setLastPage(null);
> }
> }
> } catch (Exception e) {
> log.log(ILog.ERROR, "Caught exception: " + e.getMessage() + "
> ignoring sample");
> sample.setTTLB(-1);
> sample.setTTFB(-1);
> sample.setSize(-1);
> sample.setLastPage(null);
> return sample;
> } finally {
> if (input != null) {
> input.close();
> }
> }
>
> if (sample.getLastPage() != null && expectTitle_ != null) {
> String receivedTitle = getTitle(buf.toString());
>
> if (!expectTitle_.trim().equals(receivedTitle.trim())) {
> log.log(ILog.ERROR, "' Expected title: '" +
> expectTitle_ + "' got '" + receivedTitle + "'");
> }
> }
>
> return sample;
> }
>
> --------------------------
>
>
> --
> Mvh,
> Endre
>
>
>
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>
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