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POHow do I detect an authentication challenge from a UIWebView?
 

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  1. POHow do I detect an authentication challenge from a UIWebView?
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    <p>I've seen <a href="https://stackoverflow.com/questions/1769888/how-to-display-the-authentication-challenge-in-uiwebview">many</a> <a href="https://stackoverflow.com/questions/3818120/how-to-implement-ntlm-authentication-for-uiwebview?lq=1">questions</a> that ask (and answer) how to supply credentials when you know beforehand that the request requires them.</p> <p>When I load a site that requests an authentication challenge, (responds with HTTP 401), my <code>UIWebViewDelegate</code> only receives the following callbacks: <code>webView:shouldStartLoadWithRequest:navigationType:</code> and sometimes <code>webViewDidStartLoad:</code> (<code>webViewDidStartLoad:</code> seems to be called if I navigate directly to the site, and it seems not to be called if I'm redirected there).</p> <p>By overriding <code>-[NSObject respondsToSelector:]</code>, the <code>UIWebViewDelegate</code> receives some calls to <code>uiWebView:resource:canAuthenticateAgainstProtectionSpace:forDataSource:</code> and <code>uiWebView:resource:didReceiveAuthenticationChallenge:fromDataSource:</code>, which could be useful, but of course those are private API and will probably get my app rejected.</p> <p>I've tested a few different mainstream apps with embedded <code>UIWebView</code>s. So far, only Chrome handles these authentication challenges properly. I've even set up my own server and validated that Chrome only <code>POST</code>s once. Twitter and Tweetbot fail just show the loading screen forever, just like mine. </p> <p>Is there another (probably very hacky) way to detect these authentication challenges other than using a second speculative <code>NSURLConnection</code>? If I make a <code>POST</code> request, that will double-<code>POST</code> everything, which is bad.</p> <p><a href="http://openradar.appspot.com/13748318" rel="nofollow noreferrer">I've added a radar to request an enhancement to UIWebView for this</a>. Please duplicate it.</p>
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    1. COThanks for making the radar request - I've duped it!
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