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More protocols

When we set the URL to transfer with the CURLOPT_URL option, we can ask for a URL using any of the protocols, URL schemes, that libcurl supports.

To try this out, we make the code accept a URL as a command line argument and we try passing in a few different schemes. FILE, FTP, plain HTTP etc.

A different URL scheme doesn’t change the libcurl program. It works the same way independently of what scheme the URL is using.

Limit what protocols to accept

Thanks to CURLOPT_PROTOCOLS, an application can tell libcurl exactly what protocols to accept in a given URL so even if the application accepts a URL as an argument, it can still restrict libcurl without having to parse the URL itself.

(URL parsing is also possible with libcurl, but is the subject of a separate episode.)

setup

Using the Makefile from the setup episode, we build the program and test it.