Trailing slash in URL breaks oEmbed

Title: Trailing slash in URL breaks oEmbed

Issue found of: March 24th, 2021

Scope(s):

• oEmbed

Steps to reproduce:

Example taken from your docs.

This works:

curl "https://soundcloud.com/oembed" -d 'format=json' -d 'url=https://soundcloud.com/forss/flickermood'

{"version":1.0,"type":"rich","provider_name":"SoundCloud","provider_url":"https://soundcloud.com","height":400,"width":"100%","title":"Flickermood by Forss","description":"From the Soulhack album,&nbsp;recently featured in this ad <a href=\"https://www.dswshoes.com/tv_commercial.jsp?m=october2007\">https://www.dswshoes.com/tv_commercial.jsp?m=october2007</a> ","thumbnail_url":"https://i1.sndcdn.com/artworks-000067273316-smsiqx-t500x500.jpg","html":"<iframe width=\"100%\" height=\"400\" scrolling=\"no\" frameborder=\"no\" src=\"https://w.soundcloud.com/player/?visual=true&url=https%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F293&show_artwork=true\"></iframe>","author_name":"Forss","author_url":"https://soundcloud.com/forss"}%

This does not work:

curl -v "https://soundcloud.com/oembed" -d 'format=json' -d 'url=https://soundcloud.com/forss/flickermood/'

{...}
HTTP/1.1 404 Not Found
{...}

Expected behaviour:

Url with trailing slash should work, alternatively make it clear in the docs trailing slashes are not allowed.

Actual behaviour:

HTTP/1.1 404 Not Found

Start by reproducing the two requests against the /oembed endpoint from the SoundCloud oEmbed documentation, comparing the URL with and without a trailing slash. Read the oEmbed documentation and the endpoint handling to determine the intended behavior; done means trailing-slash URLs work or the documentation clearly states that they are unsupported.