title: How to set HTTP request body using AFNetwork's AFHTTPRequestOperationManager?
body: <p>I am using AFHTTPRequestOperationManager (2.0 AFNetworking library) for a REST POST request.  But the manager only have the call to set the parameters.  </p>
  
  <pre><code>-((AFHTTPRequestOperation *)POST:(NSString *)URLString
                    parameters:(NSDictionary *)parameters
                       success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
                       failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
  </code></pre>
  
  <p>I need to set HTTP request body with a string as well.  How can I do it using the AFHTTPRequestOperationManager?  Thanks.</p>