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  • Mochiweb's Scalability Features

    - by ErJab
    From all the articles I've read so far about Mochiweb, I've heard this over and over again that Mochiweb provides very good scalability. My question is, how exactly does Mochiweb get its scalability property? Is it from Erlang's inherent scalability properties or does Mochiweb have any additional code that explicitly enables it to scale well? Put another way, if I were to write a simple HTTP server in Erlang myself, with a simple 'loop' (recursive function) to handle requests, would it have the same level scalability as a simple web server built using the Mochiweb framework?

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  • Calling methods or functions with Jquery

    - by Ross
    So I can call a php page using jquery $.ajax({ type: "GET", url: "refresh_news_image.php", data: "name=" + name, success: function(html) { alert(html) $('div.imageHolder').html(html); } }); However this getting a bit messy, I have a few .php files that only really preform very simple tasks. If I want to call a method $images-refresh_image(); is this possible. Failing that I could just create a big file with lots of functions in it? Thanks, Ross

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  • How to expand URLs in C#?

    - by Hao Wooi Lim
    If I have a URL like http://popurls.com/go/msn.com/l4eba1e6a0ffbd9fc915948434423a7d5, how do I expand it back to the original URL programmatically? Obviously I could use an API like expandurl.com but that will limits me to 100 requests per hour.

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  • Why is file_get_contents() faster than using fsock_open()?

    - by eds
    In PHP, sometimes I want to send an HTTP request to a remote site just to look at the response headers, so I declare it all manually and use the fsock_open() function. However, this goes much slower than calling file_get_contents() with a remote URL (which loads the whole page content). Why is this? Is there a good alternative way to get just the response headers (to check if a page returns a 404 error, for example) that works as fast as file_get_contents()?

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  • Proper way to return an array

    - by Ward
    Hey there, I never seem to get this right. I've got a method that returns a mutable array. What is the proper way to return the array and avoid potential memory leaks? If I plan to store the results locally inside another view controller, does that affect the way the array should be returned? Lastly, what if it's just an non-mutable array? Does that require a different technique? thanks, Howie

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  • Help with chat server

    - by mithun1538
    I am designing a chat server in java. The communication is Http based and not socket based. In the client side I have an applet. In the server side I have a servlet. Applet: I create a new thread to listen for incoming messages(GET method). The main thread is used to send messages(POST messages). The partial code is : public void start() { System.out.println("Creating new thread"); Thread thread = new Thread(this); thread.start(); } private String getNewMessage() { System.out.println("Inside getNewMessage"); String msg = null; try { while(msg == null) { System.out.println("Trying to listen to servlet"); URL servlet = new URL(getCodeBase(), "NewServlet?mode=msg"); URLConnection con = servlet.openConnection(); con.setUseCaches(false); DataInputStream din = new DataInputStream(new BufferedInputStream(con.getInputStream())); msg = din.readUTF(); System.out.println("message read :" + msg); } } catch (Exception e) { e.printStackTrace(); } return msg + "\n"; } public void run() { System.out.println("Inside new thread"); while(true) { System.out.println("inside first while"); String newMsg = getNewMessage(); chatOutput.append(newMsg); System.out.println("Appended!!"); } } private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { String message = chatInput.getText(); chatInput.setText(""); chatOutput.append(message + "\n"); try { System.out.println("Trying to send msg :" + message); URL url = new URL(getCodeBase(), "NewServlet"); URLConnection servletConnection = url.openConnection(); servletConnection.setDoInput(true); servletConnection.setDoOutput(true); servletConnection.setUseCaches(false); servletConnection.setRequestProperty("Content-Type", "application/octet-stream"); ObjectOutputStream out = new ObjectOutputStream(servletConnection.getOutputStream()); out.writeObject(message); out.flush(); out.close(); System.out.println("Message sent!"); } catch (Exception e) { e.printStackTrace(); } } This next code is from the servlet side. it uses the Observable interface to identify and send messages to clients. public class NewServlet extends HttpServlet { // getNextMessage() returns the next new message. // It blocks until there is one. public String getNextMessage() { // Create a message sink to wait for a new message from the // message source. System.out.println("inside getNextMessage"); return new MessageSink().getNextMessage(source);} @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("Inside Doget"); response.setContentType("text/plain"); PrintWriter out = response.getWriter(); out.println(getNextMessage()); } // broadcastMessage() informs all currently listening clients that there // is a new message. Causes all calls to getNextMessage() to unblock. public void broadcastMessage(String message) { // Send the message to all the HTTP-connected clients by giving the // message to the message source source.sendMessage(message); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("Inside DoPost"); try { ObjectInputStream din= new ObjectInputStream(request.getInputStream()); String message = (String)din.readObject(); System.out.println("received msg"); if (message != null) broadcastMessage(message); System.out.println("Called broadcast"); // Set the status code to indicate there will be no response response.setStatus(response.SC_NO_CONTENT); } catch (Exception e) { e.printStackTrace(); } } /** * Returns a short description of the servlet. * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; } MessageSource source = new MessageSource();} class MessageSource extends Observable { public void sendMessage(String message) { System.out.println("inside sendMsg"); setChanged(); notifyObservers(message); } } class MessageSink implements Observer { String message = null; // set by update() and read by getNextMessage() // Called by the message source when it gets a new message synchronized public void update(Observable o, Object arg) { // Get the new message message = (String)arg; // Wake up our waiting thread notify(); } // Gets the next message sent out from the message source synchronized public String getNextMessage(MessageSource source) { // Tell source we want to be told about new messages source.addObserver(this); System.out.println("AddedObserver"); // Wait until our update() method receives a message while (message == null) { try { wait(); } catch (Exception ignored) { } } // Tell source to stop telling us about new messages source.deleteObserver(this); // Now return the message we received // But first set the message instance variable to null // so update() and getNextMessage() can be called again. String messageCopy = message; message = null; System.out.println("Returning msg"); return messageCopy; } } As you can see I have included System.out.println("Some message"); in some places. this was just for debugging purposes. In java console, i get the following output: Creating new thread Inside new thread. inside first while. Inside getNewMessage. Trying to listen to servlet. In the servlet side, i get the following output in the tomcat logs: Inside Doget. inside getNextMessage. AddedObserver. After i type a message in the applet, and send it, I get the foll output in java console: Trying to send msg :you deR?? Message sent! But in servlet side, I dont get anything in the logs. I used the O'Reily Java Servlet Programming as reference(The observer interface comes from there). But I am not getting any chat communication between two clients. As can be understood from the logs, the POST method is not called. Any reason for this?

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  • How to configure maximum number of transport channels in WCF using basicHttpBinding?

    - by Hemant
    Consider following code which is essentially a WCF host: [ServiceContract (Namespace = "http://www.mightycalc.com")] interface ICalculator { [OperationContract] int Add (int aNum1, int aNum2); } [ServiceBehavior (InstanceContextMode = InstanceContextMode.PerCall)] class Calculator: ICalculator { public int Add (int aNum1, int aNum2) { Thread.Sleep (2000); //Simulate a lengthy operation return aNum1 + aNum2; } } class Program { static void Main (string[] args) { try { using (var serviceHost = new ServiceHost (typeof (Calculator))) { var httpBinding = new BasicHttpBinding (BasicHttpSecurityMode.None); serviceHost.AddServiceEndpoint (typeof (ICalculator), httpBinding, "http://172.16.9.191:2221/calc"); serviceHost.Open (); Console.WriteLine ("Service is running. ENJOY!!!"); Console.WriteLine ("Type 'stop' and hit enter to stop the service."); Console.ReadLine (); if (serviceHost.State == CommunicationState.Opened) serviceHost.Close (); } } catch (Exception e) { Console.WriteLine (e); Console.ReadLine (); } } } Also the WCF client program is: class Program { static int COUNT = 0; static Timer timer = null; static void Main (string[] args) { var threads = new Thread[10]; for (int i = 0; i < threads.Length; i++) { threads[i] = new Thread (Calculate); threads[i].Start (null); } timer = new Timer (o => Console.WriteLine ("Count: {0}", COUNT), null, 1000, 1000); Console.ReadLine (); timer.Dispose (); } static void Calculate (object state) { var c = new CalculatorClient ("BasicHttpBinding_ICalculator"); c.Open (); while (true) { try { var sum = c.Add (2, 3); Interlocked.Increment (ref COUNT); } catch (Exception ex) { Console.WriteLine ("Error on thread {0}: {1}", Thread.CurrentThread.Name, ex.GetType ()); break; } } c.Close (); } } Basically, I am creating 10 proxy clients and then repeatedly calling Add service method. Now if I run both applications and observe opened TCP connections using netstat, I find that: If both client and server are running on same machine, number of tcp connections are equal to number of proxy objects. It means all requests are being served in parallel. Which is good. If I run server on a separate machine, I observed that maximum 2 TCP connections are opened regardless of the number of proxy objects I create. Only 2 requests run in parallel. It hurts the processing speed badly. If I switch to net.tcp binding, everything works fine (a separate TCP connection for each proxy object even if they are running on different machines). I am very confused and unable to make the basicHttpBinding use more TCP connections. I know it is a long question, but please help!

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  • SMS GateWay in USA

    - by Punit
    Can somebody tell me best SMS gateway in USA . I want my application to send SMS using HTTP. So I would like to the best and cheap gateway which can provide api's to send sms. My App is written in VB.NET.

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  • Is it ethical to let users see the request headers from visitors to a url shortening service?

    - by soniiic
    I'm currently in the progress of making a url shortening service that will let the creator see the http request headers that the browser has made when visitors visit the url. The visitors won't be made aware that they are being tracked, but obviously nothing is personally identifiable. Is there anything I should be made aware of ethically or legally that makes this a bad idea?

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  • What does the question mark at then end of a css include url do?

    - by Bob Dylan
    I've noticed that on some websites (including SO) the link to the CSS will look like: <link rel="stylesheet" href="http://sstatic.net/so/all.css?v=6638"> I would say its safe to assume that ?v=6638 tells the browser to load version 6638 of the css file. But can I do this on my websites and can I include different versions of my CSS file just by changing the numbers?

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  • how is FLUENT api different from other API

    - by intern
    i have come across fluent api while studying DSLs. i have searched alot on FLUENT API..the basic conclusion which i could draw out was that fluent api uses method chaining in order to make the code fluent. but i cannot understand that in object oriented languages we can always create an object and can call the methods related to it. then how is FLUENT api different from it? what other features does fluent api add?

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  • Posting comments to a wordpress-blog in Android

    - by Samuh
    I am working on a module that allows users to post comments on a blog published on Wordpress. I looked at the HTML source for Post-Comment-Form displayed at the bottom of a blog entry (Leave a Reply section). Using that as a reference, I translated it to Java using DefaultHTTPClient and BasicNameValuePairs and my code looks like: DefaultHttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://xycabz.wordpress.com/wp-comments-post.php"); httppost.setHeader("Content-type","application/x-www-form-urlencoded;charset=UTF-8"); List<NameValuePair> nvps = new ArrayList<NameValuePair>(); nvps.add(new BasicNameValuePair("author","abc")); nvps.add(new BasicNameValuePair("email","[email protected]")); nvps.add(new BasicNameValuePair("url","")); nvps.add(new BasicNameValuePair("comment","entiendamonos?")); nvps.add(new BasicNameValuePair("comment_post_ID","123")); //this was a hidden field and always set to 0 nvps.add(new BasicNameValuePair("comment_parent","0")); try { httppost.setEntity(new UrlEncodedFormEntity(nvps)); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } BasicResponseHandler handler = new BasicResponseHandler(); try { Log.e("OUTPUT",httpclient.execute(httppost,handler)); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } The above code works fine when I try it out on my blog. But when I try this on the actual blog, I get HTTP 302 Found (Redirect to temporary location) exceptions in the logs. The comments never make it to the blog page. Usually, when you post a comment(on the web page) you are taken back to the blog page that enlists all the comments. The URL I am getting in the redirects is the same. Questions: 1. Could this be a post-a-comment settings problem(perhaps something the original blog owner might have set)? 2. How should my HTTPClient handle 302 status code? Eventually, I just have to notify the user of success and failure and not actually take him to the comments page.

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  • flex - SWFLoader - authentication

    - by Hamish
    I have an issue where I am trying to load an external SWF using a SWFLoader, but the HTTP server requires authentication. <mx:SWFLoader source="assets/externalswf.swf"></mx:SWFLoader> Is there any way to pass the credentials to the SWFLoader?

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  • Track results of a regular expression extractor in JMeter

    - by Glenn Slaven
    Our server returns a custom 'X-Execution-Time' HTTP response header that returns in miliseconds the time between the server getting a request and our code returning a page, ie how long our code takes to run. I'm using JMeter to do some testing & I'd like to be able to report on this number of over time. I've setup this regular expression extractor: X-Execution-Time:\s(\d+) but I don't know how to get JMeter to report on this number per request so i can get a trend over time

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  • Delegates and ParamArray - Workaround Suggestions?

    - by M.A. Hanin
    Some predefined methods contain a ParamArray in their signature. Delegates, however, cannot contain a ParamArray in their signature. Main question: Assume you wish to create a delegation mechanism for a specific method which requires a ParamArray. How would you work around this constraint? "Bonus" question: Assume you wish to create a generalized delegation mechanism for all methods which require ParamArray, how would you do that?

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  • Strange 301 redirect problem

    - by user261231
    Hi all, I'm trying to redirect all URLs that start with "/?page=" to "/stuff/?page=" I have this in my .htaccess file: RewriteEngine on RedirectMatch 301 ^/?page=/(.*)$ http://www.mysite.com/stuff/$1 But it's not working.. What am I doing wrong?

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  • RESTEasy - access to web folder for geting image

    - by Trick
    I would like to allow users to access images saved in web folder. For example - I have an image in web root folder "blank.png". But the link http://localhost:8080/myapp/blank.png returns 404 (not found). Adding type to resteasy.media.type.mappings does not work. I am a bit of a newbie in RESTEasy...

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  • How much network overhead does TLS add compared to a non-encrypted connection?

    - by Daniel Sterling
    (Approximately) how many more bits of data must be transferred over the network during an encrypted connection compared to an unencrypted connection? IIUC, once the TLS handshake has completed, the number of bits transferred is equal to those transferred during an unencrypted connection. Is this accurate? As a follow up, is transferring a large file over https significantly slower than transferring that file over http, given fast processors and the same (ideal) network conditions?

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  • Can anyone explain UriMatcher (Android SDK)?

    - by mobibob
    I have been tasked with designing my web services client code to use the utility class UriMatcher in the Android SDK. Unfortunately, the example in the Dev Guide does not relate to anything in my mind. I know I am missing some fundamental points to the functionality and possibly about Uri itself. If you can tie it to some web APIs that are accessible with HTTP POST request, that would be ideal.

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  • Making sure a web page is not cached, across all browsers.

    - by Edward Wilde
    Our investigations have shown us that not all browsers respect the http cache directives in a uniform manner. For security reasons we do not want certain pages in our application to cached, ever, by the web browser. This must work for at least the following browsers: Internet Explorer versions 6-8 FireFox versions 1.5 - 3.0 Safari version 3 Opera 9 Our requirement came from a security test. After logging out from our website you could press the back button and view cached pages.

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  • Can a client dictate whether or not HttpContext is created?

    - by Keivan
    We are getting a lot of hits from Googlebot and BingBot and it appears that none of these requests have an HttpContext. I originally thought that every http request will get a context which obviously is not the case so I'm trying to understand how does an HttpContext gets constructed, is it part of the negotiation between client and server?

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  • how to reassemble tcp segment?

    - by jerams
    im now developing a project using winpcap..as i have known packets being sniffed are usually fragmented packets. how to reassemble this TCP segements?..any ideas, suggestion or tutorials available?.. this i assume to be the only way i can view the HTTP header... thanks!..

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