Как сделать запрос curl через прокси?

man curl

-x, --proxy <[protocol://][user:password@]proxyhost[:port]>
    Use the specified proxy.

    The proxy string can be specified with a protocol:// prefix to specify alternative proxy protocols.  Use
    socks4://, socks4a://, socks5:// or socks5h:// to request the specific SOCKS version to be used. No pro‐
    tocol specified, http:// and all others will be treated as HTTP proxies. (The protocol support was added
    in curl 7.21.7)

    If the port number is not specified in the proxy string, it is assumed to be 1080.

    This  option  overrides existing environment variables that set the proxy to use. If there's an environ‐
    ment variable setting a proxy, you can set proxy to "" to override it.

    All operations that are performed over an HTTP proxy will transparently be converted to HTTP.  It  means
    that certain protocol specific operations might not be available. This is not the case if you can tunnel
    through the proxy, as one with the -p, --proxytunnel option.

    User and password that might be provided in the proxy string are URL decoded by curl. This allows you to
    pass in special characters such as @ by using %40 or pass in a colon with %3a.

    The  proxy  host  can  be specified the exact same way as the proxy environment variables, including the
    protocol prefix (http://) and the embedded user + password.

    If this option is used several times, the last one will be used.