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    <p>Copying my answer from <a href="https://stackoverflow.com/q/8251175/918764">https://stackoverflow.com/q/8251175/918764</a> - you're most likely getting this message because of you're calling <code>getResponseString</code> on a request that has failed. You should make sure that you check if you got a response before calling this: one way I've found to test for total request failure (i.e. network/server down) is to check:</p> <pre><code>if (request.responseStatusCode == 0) { // the request failed entirely } else { // you at least got a HTTP response } </code></pre> <hr> <p>This notably happens if you call <code>[asiHttpRequest getResponseString]</code> before a valid response has been returned and the request encoding has been set (i.e. couldn't connect to server).</p> <p>The easiest way to workaround this warning is by editing the <code>ASIHTTPRequest</code> class, remove the <code>@synthesize responseEncoding</code> and adding a simple custom getter/setter so you can return the default encoding if the response encoding isn't set:</p> <pre><code>- (NSStringEncoding) responseEncoding { return responseEncoding || self.defaultResponseEncoding; } - (void) setResponseEncoding:(NSStringEncoding)_responseEncoding { responseEncoding = _responseEncoding; } </code></pre> <p>There's also a more specific workaround for the <code>getResponseString</code> method, which I think is the only place that uses the encoding without checking for a value - since the encoding should be set for any non-zero length response:</p> <pre><code>- (NSString *)responseString { NSData *data = [self responseData]; if (!data) { return nil; } // --- INSERT THIS BLOCK --- // If the 'data' is present but empty, return a simple empty string if (data.length == 0) { return @""; } //assert(self.responseEncoding); // if you're into runtime asserts, uncomment this // --- END OF BLOCK TO INSERT --- return [[[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:[self responseEncoding]] autorelease]; } </code></pre>
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    1. POIncorrect NSStringEncoding value 0x0000 detected (using ASIHTTPRequest)
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    1. COThanks, this was very helpful!
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    2. COGlad to help! We have a few other changes like this to the ASIHTTPRequest code that we use, so I think I'll make a GitHub fork soon and commit them all there for the Greater Good.
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    3. COYeah, that sounds like a good idea :)
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