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A little known one is

getmac

It shows the MAC address(es) of your network adapter(s).

(Back to the days when I used Subversion) I had similar problem with proxying to Apache SVN from Nginx SSL frontend. Suppose Nginx SSL frontend is https ://host and we'd like to proxy connections to the internal Apache SVN server http ://svn

The problem occurs when you try to copy a resource is with Destination header:

COPY /path HTTP/1.1
Host: host
Destination: https://host/another_path

As you can see Destination header still contains https schema. The fix is pretty evident --

location / {
    # to avoid 502 Bad Gateway:
    # http://vanderwijk.info/Members/ivo/articles/ComplexSVNSetupFix
    set $destination $http_destination;

    if ($destination ~* ^https(.+)$) {
         set $destination http$1;
    }

    proxy_set_header Destination $destination;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $remote_addr;

    proxy_pass http://svn;
}