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PO403 Error with WiFi Hotspots
 

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    <p>I have an iOS app that connects to a Django server via XMLRPC (the protocol doesn't really matter). Authentication is persisted with standard cookies and is transparently handled by <code>AFNetworking</code> via <code>NSURLConnection</code>. The Django XMLRPC library returns a <code>403</code> error when a request fails authentication, and when this happens the app displays a login page to the user. This approach has worked fine for a few years.</p> <p>A recent problem came up with a user who connected to a WiFi hotspot but did not authenticate with the hotspot. They loaded the app and was shown the login page, which must have been the result of a <code>403</code> error coming back from the hotspot. If they first authenticate with the hotspot then everything works fine.</p> <p>I'm trying to find a solution to prevent my app from interpreting such <code>403</code> errors as a failed authentication. I assume one of two things are happening:</p> <ul> <li>the hotspot redirects to a URL that returns a <code>403</code> error; or</li> <li>the hotspot immediately returns a <code>403</code> error.</li> </ul> <p>The first scenario is easy to manage by blocking <code>301</code> and <code>302</code> redirects. Fortunately, <code>AFNetworking</code> makes this easy.</p> <p>The second scenario is more difficult and I see no way of knowing from where the <code>403</code> originated.</p> <p>Does anyone know if there is anything else in the header to detect the origin of a <code>403</code>, or if there is a standard practice of redirecting the request when not signed into a hotspot?</p> <p><strong>Edit</strong></p> <p>Here are what my Django service header looks like on a <code>403</code>:</p> <pre><code>HTTP/1.1 403 FORBIDDEN Server: nginx Date: Sun, 28 Apr 2013 07:21:34 GMT Content-Type: text/html; charset=utf-8 Content-Length: 0 Connection: keep-alive Vary: Cookie Set-Cookie: sessionid=5a5ce154d1229e40c3773e8f6999a32d; expires=Sun, 18-Aug-2013 07:21:34 GMT; httponly; Max-Age=9676800; Path=/ </code></pre>
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    1. COYou can log the returned headers to see what's available. Do you have access to modify the web service?
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    2. COI regret the hotspot in question is on the other side of the world, so I can't check that. I edited my question to show what the headers from my webservice looks like... Nothing useful there.
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    3. CONow that I think about it... I could create some middleware to add something to the `HTTPRepsonse` to identify the source of the response... Seems like a hack.
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