Use icons based on MIME type as thumbnails for non-image responses.

Classes/Network/FLEXNetworkRecorder.m

@@ -9,6 +9,7 @@
 #import "FLEXNetworkRecorder.h"
 #import "FLEXNetworkTransaction.h"
 #import "FLEXUtility.h"
+#import "FLEXResources.h"
 
 NSString *const kFLEXNetworkRecorderNewTransactionNotification = @"kFLEXNetworkRecorderNewTransactionNotification";
 NSString *const kFLEXNetworkRecorderTransactionUpdatedNotification = @"kFLEXNetworkRecorderTransactionUpdatedNotification";
@@ -102,16 +103,23 @@ NSString *const kFLEXNetworkRecorderUserInfoTransactionKey = @"transaction";
 
     [self.responseCache setObject:responseBody forKey:requestId cost:[responseBody length]];
 
-    [self postUpdateNotificationForTransaction:transaction];
-
-    if ([transaction.response.MIMEType hasPrefix:@"image/"]) {
+    NSString *mimeType = transaction.response.MIMEType;
+    if ([mimeType hasPrefix:@"image/"]) {
         // Thumbnail image previews on a background queue
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
             NSInteger maxPixelDimension = [[UIScreen mainScreen] scale] * 32.0;
             transaction.responseThumbnail = [FLEXUtility thumbnailedImageWithMaxPixelDimension:maxPixelDimension fromImageData:responseBody];
             [self postUpdateNotificationForTransaction:transaction];
         });
+    } else if ([mimeType isEqual:@"application/json"]) {
+        transaction.responseThumbnail = [FLEXResources jsonIcon];
+    } else if ([mimeType isEqual:@"text/plain"]){
+        transaction.responseThumbnail = [FLEXResources textPlainIcon];
+    } else if ([mimeType isEqual:@"text/html"]) {
+        transaction.responseThumbnail = [FLEXResources htmlIcon];
     }
+
+    [self postUpdateNotificationForTransaction:transaction];
 }
 
 - (void)recordLoadingFailedWithRequestId:(NSString *)requestId error:(NSError *)error