Respond with 400 when invalid URL given to oembed endpoint
Respond with 400 when invalid URL given to oembed endpoint

SunDi3yansyah/asciinema.org,asciinema/asciinema-server,SunDi3yansyah/asciinema.org,SunDi3yansyah/asciinema.org,asciinema/asciinema.org,asciinema/asciinema-server,SunDi3yansyah/asciinema.org,asciinema/asciinema.org,SunDi3yansyah/asciinema.org,asciinema/asciinema-server,asciinema/asciinema-server,asciinema/asciinema.org,asciinema/asciinema.org