Downloading images with wget fails without error.
$ wget https://dl.twrp.me/crackling/twrp-3.0.3-0-crackling.img
--2017-02-06 01:53:21-- https://dl.twrp.me/crackling/twrp-3.0.3-0-crackling.img
Resolving dl.twrp.me (dl.twrp.me)... 198.27.116.169
Connecting to dl.twrp.me (dl.twrp.me)|198.27.116.169|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 7283 (7.1K) [text/html]
Saving to: ‘twrp-3.0.3-0-crackling.img’
twrp-3.0.3-0-crackling.img 100%[===========================>] 7.11K --.-KB/s in 0s
2017-02-06 01:53:21 (847 MB/s) - ‘twrp-3.0.3-0-crackling.img’ saved [7283/7283]
$ gpg --verify twrp-3.0.3-0-crackling.img.asc
gpg: assuming signed data in 'twrp-3.0.3-0-crackling.img'
gpg: Signature made Thu 19 Jan 2017 13:14:41 GMT
gpg: using RSA key 1D8597D7891A43DF
gpg: BAD signature from "TeamWin <[email protected]>" [unknown]
Instead it downloads the download page. This seems dangerous: a user who doesn't verify the integrity of their download would flash this file to their device.