AFNetworking AFHTTPRequestOperation block is never called - ios

Question

I'm using AFNetworking to send a multipart form to a web-server, and i'm having some trouble with my AFHTTPRequestOperation. It's success and failure blocks are never called, after i start it.
Here is my code (a resume of it)
NSMutableURLRequest *request = [[ServerAPI sharedClient] multipartFormRequestWithMethod:#"POST" path:postUrl parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData> formData) {
[formData appendPartWithFileData:picture.picture_data name:#"InputFile" fileName:picture.name mimeType:#"image/jpg"];
}];
AFHTTPRequestOperation *operation = [[ServerAPI sharedClient] HTTPRequestOperationWithRequest: request success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"Success");
} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Failure");
}];
[operation setUploadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
NSLog(#"%f", (totalBytesRead / (float) totalBytesExpectedToRead));
}];
[[ServerAPI sharedClient] enqueueHTTPRequestOperation:operation];
I can see the logs of the progress, but success and failure blocks are never called.
picture.picture_data is a NSData initialized with a UIImageJPEGRepresentation(image, 0.7)
ServerAPI is a subclass of AFHTTPClient, and sharedCliend is a singleton method.
Which are the reasons for AFNetworking don't call my blocks, not even with an proper error message?
Thank you all!
Edit
I do a get request with the same URL just before this one, and it works as usual. The URL i'm using is: part/_layouts/UploadEx.aspx?List=%7BD432BF97-7175-40C1-8E0D-27D8661CBC90%7D&RootFolder=%2Fpwa%2Fpart%2FLibrary&Source=http%3A%2F%2Fwww%2Emysite%2Ecom%2Fpwa%2Fpart%2FLibrary%2FForms%2FAllItems%2Easpx&IsDlg=1

Answer 1

In your code, check your postUrl . The BaseURL+postURL must be valid. Try upload image using normal web browser using URL BaseURL+postURL.
Edit
method HTTPRequestOperationWithRequest:success:failure: does not work for file uploading, but works for json/html fetching.
Try use
AFHTTPRequestOperation *operation = [[AFJSONRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
NSLog(#"%f", (totalBytesRead / (float) totalBytesExpectedToRead));
}];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"Success");
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Failure");
}];
[[ServerAPI sharedClient] enqueueHTTPRequestOperation:operation];