optimization: when responseSerializer is set a AFHTTPResponseSerializer instance

Author: leleliu008

AFNetworkActivityLogger/AFNetworkActivityConsoleLogger.m

@@ -74,9 +74,24 @@ - (void)URLSessionTaskDidFinish:(NSURLSessionTask *)task withResponseObject:(id)
                 break;
         }
     } else {
+        id responseBody = responseObject;
+        
+        if(responseHeaderFields != nil && [responseObject isKindOfClass:[NSData class]]) {
+            id contentTypeObj = [responseHeaderFields objectForKey:@"Content-Type"];
+            if([contentTypeObj isKindOfClass:[NSString class]]) {
+                NSString *contentType = contentTypeObj;
+                if([contentType containsString:@"application/json"]
+                   || [contentType containsString:@"application/xml"]
+                   || [contentType containsString:@"application/x-www-form-urlencoded"]
+                   || [contentType containsString:@"text/html"]) {
+                    responseBody = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
+                }
+            }
+        }
+        
         switch (self.level) {
             case AFLoggerLevelDebug:
-                NSLog(@"%ld '%@' [%.04f s]: %@ %@", (long)responseStatusCode, [[task.response URL] absoluteString], elapsedTime, responseHeaderFields, responseObject);
+                NSLog(@"%ld '%@' [%.04f s]: %@ %@", (long)responseStatusCode, [[task.response URL] absoluteString], elapsedTime, responseHeaderFields, responseBody);
                 break;
             case AFLoggerLevelInfo:
                 NSLog(@"%ld '%@' [%.04f s]", (long)responseStatusCode, [[task.response URL] absoluteString], elapsedTime);