What that API`s means?

I got a task:

...

When you're done, make a POST request to the following APIs:

/code1, /code2, /code3, ..., /code100

with the header "X-COOL-SUM" equal to your answer. Some of the routes will return a letter. The code is the letters put together in the order of the requests.

Does it mean i should make a 100 request to http://ift.tt/2nPxtBq ?

I have already tried to do that, but got 404 error only.