Why Am I Getting Socket.gaierror: [errno -2] From Python Httplib

My Python code is very simple, make a GET request on a webpage created on an Arduino Yún. import httplib conn = httplib.HTTPConnection('yun.local') conn.request('GET', '/arduino/r

Solution 1:

The socket.gaierror comes from Python not being able to run getaddrinfo() or getnameinfo(). In your case it is likely the first one. That function takes a host and a port and returns a list of tuples with information about how to connect to a host. If you give a host name to that function there will be a try to resolve the IP address deeper below.

So, the error should come from Python not being able to resolve the address you have written (yun.local) to a valid IP address. I would suggest you look in /etc/hosts on the device to see if it is defined there. You can also try with command line tools such as host or telnet, just to check the resolving:

For example:

[pugo@q-bert ~]$ telnet localhost 80
Trying ::1...
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

There it managed to resolve my localhost to ::1 (IPv6) and 127.0.0.1 (IPv4), because it exists in /etc/resolv.conf. If I instead try with your host:

[pugo@q-bert ~]$ telnet yun.local80
telnet: could not resolve yun.local/80: Name or service not known

Solution 2:

In my case, I changed the hostname. So I realized the /etc/hosts remained the old hostname, I just updated to the new hostname in the /etc/hosts file and that worked for me.