when http code 301,302, can follow rediect
uncompress false means zip wrong, download again
Merge pull request #7754 from dabingnn/v3_addCallBackForRenderTexture

add callback for RenderTexture::saveToFile
[ci skip]
Merge pull request #7747 from liang8305/v3

AssetsManager not follow rediect, and will not download again when uncompress false