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    <p>The following code describes a simple example using <code>POST</code> method.(<em>How one can pass data by <code>POST</code> method</em>) </p> <p>Here, I describe how one can use of POST method. </p> <p><strong>1.</strong> Set post string with actual username and password.</p> <pre><code>NSString *post = [NSString stringWithFormat:@"Username=%@&amp;Password=%@",@"username",@"password"]; </code></pre> <p><strong>2.</strong> Encode the post string using <code>NSASCIIStringEncoding</code> and also the post string you need to send in NSData format. </p> <pre><code>NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; </code></pre> <p>You need to send the actual length of your data. Calculate the length of the post string.</p> <pre><code>NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]]; </code></pre> <p><strong>3.</strong> Create a Urlrequest with all the properties like <code>HTTP</code> method, http header field with length of the post string. Create <code>URLRequest</code> object and initialize it. </p> <pre><code>NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; </code></pre> <p>Set the Url for which your going to send the data to that request.</p> <pre><code>[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]]; </code></pre> <p>Now, set <strong>HTTP</strong> method (<em>POST or GET</em>). Write this lines as it is in your code.</p> <pre><code>[request setHTTPMethod:@"POST"]; </code></pre> <p>Set <code>HTTP</code> header field with length of the post data. </p> <pre><code>[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; </code></pre> <p>Also set the Encoded value for HTTP header Field.</p> <pre><code>[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; </code></pre> <p>Set the <code>HTTPBody</code> of the urlrequest with postData.</p> <pre><code>[request setHTTPBody:postData]; </code></pre> <p><strong>4.</strong> Now, create URLConnection object. Initialize it with the URLRequest.</p> <pre><code>NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]; </code></pre> <p>It returns the initialized url connection and begins to load the data for the url request. You can check that whether you <code>URL</code> connection is done properly or not using just <strong>if/else</strong> statement as below.</p> <pre><code>if(conn) { NSLog(@"Connection Successful"); } else { NSLog(@"Connection could not be made"); } </code></pre> <p><strong>5.</strong> To receive the data from the HTTP request , you can use the delegate methods provided by the URLConnection Class Reference. Delegate methods are as below. </p> <pre><code>// This method is used to receive the data which we get using post method. - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data // This method receives the error report in case of connection is not made to server. - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error // This method is used to process the data after connection has made successfully. - (void)connectionDidFinishLoading:(NSURLConnection *)connection </code></pre> <p><strong>Also Refer</strong> <a href="http://deusty.blogspot.in/2006/11/sending-http-get-and-post-from-cocoa.html" rel="noreferrer">This</a> <strong>and</strong> <a href="http://yuvarajmanickam.wordpress.com/2012/10/17/nsurlconnection-basics-for-ios-beginners/" rel="noreferrer">This</a> <strong>documentation</strong> for <code>POST</code> method. </p> <p>And here is best example with source code of <a href="https://web.archive.org/web/20150315072521/http://kemal.co/index.php/2012/02/fetching-data-with-getpost-methods-by-using-nsurlconnection/" rel="noreferrer">HTTPPost Method.</a></p>
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    1. COAlso check if there is no caching going on. That would explain why you got a '200', without anything happening on the server.
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    2. COCheck the accepted answer of http://stackoverflow.com/questions/405151/is-it-possible-to-prevent-an-nsurlrequest-from-caching-data-or-remove-cached-dat and/or google for "nsurlconnection cache policy"
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    3. COThank you so much i checked so much threads and this: http://yuvarajmanickam.wordpress.com/2012/10/17/nsurlconnection-basics-for-ios-beginners/ just worked.
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