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    <p>There's a difference between your HTTP traffic for iOS and for Android. This is guaranteed, otherwise you'd get identical behaviour from the server. The difference is probably in HTTP header(s) &amp;/or parameter(s).</p> <p>This is very difficult to debug remotely via SO Q&amp;A - E.g. we don't know what headers &amp; parameters your iOS client is successfully using nor how your server is configured &amp; programmed.</p> <p>How to diagnose the problem &amp; correct yourself:</p> <ol> <li>Trace your working HTTP traffic: iOS client &lt;-> server</li> <li>Trace your non-working HTTP traffic: Android client &lt;-> server</li> <li>Compare (2) and (3). For the most thorough comparison, save each HTTP request and response message as a separate file for (2) and (3), then <code>diff</code> the corresponding files.</li> </ol> <p>Recommended HTTP tracing tools:</p> <ul> <li><a href="http://fiddler2.com/" rel="nofollow">Fiddler2</a> (windows only) See also <a href="http://fiddler2.com/documentation/Configure-Fiddler/Tasks/ConfigureFiddler" rel="nofollow">Documentation</a></li> <li><a href="http://www.portswigger.net/burp/downloadfree.html" rel="nofollow">Burp</a> (JVM-based: windows, linux, OSX, etc) See also <a href="http://www.portswigger.net/burp/help/suite_gettingstarted.html" rel="nofollow">Getting Started</a></li> <li><a href="https://www.owasp.org/index.php/Category%3aOWASP_WebScarab_Project" rel="nofollow">WebScarab</a> (JVM-based: windows, linux, OSX, etc) See also <a href="https://www.owasp.org/index.php/WebScarab_Getting_Started" rel="nofollow">Getting Started</a></li> </ul> <p><strong>UPDATE</strong></p> <p>Seems you have the same problem for both GET and POST: the server is configured for BASIC authentication, but the client is not following the authentication protocol correctly. I think it just shows as a slightly different sympton in the two cases: for GET it says 'resource not found' (because you're not authenticated) and for POST the resource is <em>given by you</em>, but the server says you're not authorized to change the resource on the server. I suggest you've done enough (good!) debugging of request contents and now you should stop and focus on getting authentication working.</p> <ol> <li>Send you GET/POST request to the server <em>without</em> <code>Authorization</code> header</li> <li>Allow the server to prompt you for authentication with a 401 response with an <code>WWW-Authenticate</code> header containing a challenge string (e.g. <code>WWW-Authenticate: Basic realm="Protected"</code> see <a href="http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20HTTP%20basic%20authentication%20and%20digest%20authentication.pdf" rel="nofollow">RFC 2617 HTTP Basic Authentication and Digest Authentication</a>)</li> <li>Now send an additional GET request to server that (either without/with the original request contents), but includes the Authentication header, with Base 64 encoded username:password (<code>Authorization: Basic ZnJhbms6ZmllZGxlcg==</code>)</li> </ol>
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    1. COplease look at my update.
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    2. COGood work. Thanks. :-) Did you see a response message with Burp?
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    3. COI just see request in Burp. Do I need to make any change in settings to see response? Thanks to keep helping.
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