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    <p>UPDATE: I have created a github repository to contain the latest code I am using. All changes will be posted there. <a href="https://github.com/Hackmodford/HMFJSONResponseSerializerWithData">https://github.com/Hackmodford/HMFJSONResponseSerializerWithData</a></p> <p>The answer comes from this issue on github. <a href="https://github.com/AFNetworking/AFNetworking/issues/1397">https://github.com/AFNetworking/AFNetworking/issues/1397</a></p> <p>gfiumara is the dev who came up with this. I have only slightly modified his subclass of AFJSONResponseSerializer to include an actual string instead of the NSData</p> <pre><code>//MSJSONResponseSerializerWithData.h #import "AFURLResponseSerialization.h" /// NSError userInfo key that will contain response data static NSString * const JSONResponseSerializerWithDataKey = @"JSONResponseSerializerWithDataKey"; @interface MSJSONResponseSerializerWithData : AFJSONResponseSerializer @end </code></pre> <hr> <pre><code>// MSJSONResponseSerializerWithData.m #import "MSJSONResponseSerializerWithData.h" @implementation MSJSONResponseSerializerWithData - (id)responseObjectForResponse:(NSURLResponse *)response data:(NSData *)data error:(NSError *__autoreleasing *)error { if (![self validateResponse:(NSHTTPURLResponse *)response data:data error:error]) { if (*error != nil) { NSMutableDictionary *userInfo = [(*error).userInfo mutableCopy]; userInfo[JSONResponseSerializerWithDataKey] = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSError *newError = [NSError errorWithDomain:(*error).domain code:(*error).code userInfo:userInfo]; (*error) = newError; } return (nil); } return ([super responseObjectForResponse:response data:data error:error]); } @end </code></pre> <p>Here is an example of how I use it in the failure block.</p> <pre><code>} failure:^(NSURLSessionDataTask *task, NSError *error) { NSLog(@"%@",[error.userInfo objectForKey:@"JSONResponseSerializerWithDataKey"]); }]; </code></pre>
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    1. COKeep in mind that setting a value of `nil` to `userInfo[JSONResponseSerializerWithDataKey]` will throw an exception. To circumvent this, use KVC. `setValue:forKey:` tests the value first to see if it's `nil`. If it is, it treats the instruction as though you had called `removeObjectForKey:` instead — which will gracefully do nothing if the object isn't there.
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    2. CO@James are you suggesting this instead? [userInfo setValue:[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] forKey:JSONResponseSerializerWithDataKey];
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    3. COThat's exactly it.
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