URL incorrectly detected as valid

[JackMorganNZ]

Linkie detects this link as 200, when it shows as 404: https://www.coursera.org/learn/insidetheinternet

See: uccser/cs-field-guide#789

[eAlasdair]

This link is also 404 and was not discovered by Linkie:
https://learn.code.org/s/1/level/102

The initial link from this issue is no longer invalid

[JackMorganNZ]

wget https://learn.code.org/s/1/level/102
--2019-05-31 16:09:52--  https://learn.code.org/s/1/level/102
Resolving learn.code.org (learn.code.org)... 52.87.18.2, 54.82.136.198
Connecting to learn.code.org (learn.code.org)|52.87.18.2|:443... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://studio.code.org/s/1/level/102 [following]
--2019-05-31 16:09:53--  https://studio.code.org/s/1/level/102
Resolving studio.code.org (studio.code.org)... 13.35.142.220
Connecting to studio.code.org (studio.code.org)|13.35.142.220|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2019-05-31 16:09:54 ERROR 404: Not Found.

This is probably due to it returning an initial 301 response. Thanks for pointing it out.