Os links dos arquivos do Dropbox vão para uma página da Web, que redireciona para o conteúdo real.
O link para o PDF acima está na verdade em
https://dl.dropboxusercontent.com/content_link/v0qPqJrCIS7IvTmXr0pXBFKnnbmZpsRfSNxDhfqcjLg88F7ErNCyNAaOIATPKrWT?dl=1
A maneira mais fácil de determinar o URL real é:
curl "https://www.dropbox.com/s/tf7e7vndqd9hv05/Ace_The_IELTS.pdf?dl=1" -o "temp.txt"
(observe o dl=1
)
Em seguida, observe o temp.txt
:
<html>
<head><title>Found</title></head>
<body>
<h1>Found</h1>
<p>The resource was found at <a href="https://dl.dropboxusercontent.com/content_link/jGdZ7mfVMNV7VCiauE9T7kGpaOyBKyu6i8KaAzqLzUSaEd2ElXllzDeQEC8DCxHr?dl=1">https://dl.dropboxusercontent.com/content_link/jGdZ7mfVMNV7VCiauE9T7kGpaOyBKyu6i8KaAzqLzUSaEd2ElXllzDeQEC8DCxHr?dl=1</a>;
you should be redirected automatically.
<!-- --></p>
<hr noshade>
<div align="right">WSGI Server</div>
</body>
</html>
Então você verá o URL correto.