cURL cannot connect to localhost but browser can
curl, osx-mavericks, ruby-on-rails, thin
Solution
This is a curl bug (a strange one), where curl fails to fall back to IPv4 if there's an IPv6 entry in /etc/hosts that doesn't respond.
You can force it to use IPv4 via the `-4` option.
Problem
I'm running a Rails app locally (Thin server), and I can connect locally from the browser (localhost:3000), but when I try to use curl, I get: ``` curl -H 'id:1' -i 'http://localhost:3000/api/data' -v * Hostname was NOT found in DNS cache * Trying ::1... * Adding handle: conn: 0x7fd121808200 * Adding handle: send: 0 * Adding handle: recv: 0 * Curl_addHandleToPipeline: length: 1 * - Conn 0 (0x7fd121808200) send_pipe: 1, recv_pipe: 0 * Connection failed * connect to ::1 port 3000 failed: Connection refused * Trying fe80::1... * Connection failed * connect to fe80::1 port 3000 failed: Connection refused * Failed to connect to localhost port 3000: Connection refused * Closing connection 0 curl: (7) Failed to connect to localhost port 3000: Connection refused ``` This used to work just fine, but I recently updated to Mavericks, which I suspect may have broken something. I can also curl successfully from the web.