Several ways. In Unix files are streams of bytes. In HTTP resources are complex entities with MIME types, multiple representations, encodings, etc. HTTP URL str

Several ways. In Unix files are streams of bytes. In HTTP resources are complex entities with MIME types, multiple representations, encodings, etc. HTTP URL structure supports parameters and there is a method for providing data and obtaining a result back, a sort of RPC. On the other side Unix has users and permissions, HTTP does not and you have to build your own.