download link for files stored on a website without DNS entry ( local host files )

i am developing a site that has no DNS RR yet. I have modified the windows host file so i can work with it.

Is it normal that the file is not downloaded when i click on ?

<a href="http://mathieu-icstar.dev.univ-amu.fr/system/files/2019-10/SUFLE-emplois_du_temps_240919.pdf" type="application/pdf; length=919827" target="_blank">SUFLE-emplois_du_temps_240919.pdf</a>

when copying the href on a new window works