Jiaxu

Attached two full crash stack frames. [MyApp 7-28-16, 12-13.crash.txt](https://github.com/ibireme/YYImage/files/387666/MyApp.7-28-16.12-13.crash.txt) [MyApp 7-28-16, 12-12.crash.txt](https://github.com/ibireme/YYImage/files/387667/MyApp.7-28-16.12-12.crash.txt)

Workaround: Replace YYWebImageOptionProgressive with other available option while setImageWithURL, however this might delay your images displaying.

最新版本whistle遇到同样问题，protocol栏显示HTTPS>HTTP。替换回2.9.30版本就没有问题了。