need help with content length error

[Paul Travers]

Hi all,

I am posting the following from my arduino uno + wifly shield

POST  /events/?sense_key=<my sense key> HTTP/1.1

Host: api.sen.se

Content-Type: application/json

Content-Length: 106

\r\n

[{"feed_id":41433, "value" : 25.00},{"feed_id":41434,"value": 702.00},{"feed_id":41435,"value": 119.00}]

\r\n

and in return I get 

HTTP/1.1 411 Length Required

Server: nginx/0.7.65

.... plus other stuff but the above is the meat of the response.

I have counted the content length and it is 104 characters plus 2 for the crlf at the end of the line so the content length looks to be right. Returning 104 for the length gives the same error.  Can anyone see if I have done something stupid that would suggest why I am getting this error? 

Any help gratefully appreciated while I still have hair and sanity.