It worked here, Allin.

[helio@localhost ~]$ cat c.sh
curl -i -X POST -H 'Content-Type: application/json' -d '{"seriesid":["LEU0254555900", "APU0000701111"], "startyear":"2002", "endyear":"2012"}' http://api.bls.gov/publicAPI/v1/timeseries/data/
[helio@localhost ~]$ sh c.sh
HTTP/1.1 200 OK
Date: Wed, 23 Apr 2014 11:17:16 GMT
Content-Type: text/plain;charset=ISO-8859-1
Content-Length: 12462

{"status":"REQUEST_SUCCEEDED","responseTime":96,"message":[],"Results":{
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}}[helio@localhost ~]$