Why does curl allow use of the file URL scheme, but not wget

问题

This question refers to curl 7.21.4 and GNU Wget 1.13.4, I don't know if the answer is version specific.

Using the file URI scheme I can get local file using curl as such

$ curl file://localhost/Users/dave/.vimrc
contents of .vimrc

However if I try the same using wget I receive an error:

$ wget file://localhost/Users/dave/.vimrc
file://localhost/Users/dave/.vimrc: Unsupported scheme `file'

Does anyone know why this is the case?

回答1:

Because Wget has not been written to support file:// URLs. (It's front web page clearly states "GNU Wget is a free software package for retrieving files using HTTP, HTTPS and FTP")

Allow me to point to a little curl vs wget comparison.

回答2:

wget only supports the HTTP, HTTPS, and FTP protocols.

来源：https://stackoverflow.com/questions/10440976/why-does-curl-allow-use-of-the-file-url-scheme-but-not-wget