POST return values and failed POSTs | ThingSpeak API | Forum

What are the three values returned by POST?  I couldn't find them explained in the API documentation.  Pretty sure the second value is the entry_id.

Once in a while, a POST seems to fail, even though the server sends an OK/200 response.  Why might this be? Below is a log of status messages from four consecutive POSTs.  Note the different return values from the third POST.  Indeed this data was not captured.  The numbers that begin each status message are milliseconds.

7359 XBee RX/ACK
7428 Connected to server
7438 POST 2091,3,71.2
7580 Server response
HTTP/1.1 200 OK
Server: nginx/0.8.53
Date: Sat, 16 Jul 2011 13:10:40 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding
Status: 200
ETag: "46922a0880a8f11f8f69cbb52b1396be"
Cache-Control: max-age=0, private, must-revalidate

3
582
0

7651 Disconnected

60000 **STATUS POSTs=1 connectFAIL=0 discWAIT=0
68307 XBee RX/ACK
68375 Connected to server
68386 POST 2092,3,71.0
68514 Server response
HTTP/1.1 200 OK
Server: nginx/0.8.53
Date: Sat, 16 Jul 2011 13:11:41 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding
Status: 200
ETag: "9ad6aaed513b73148b7d49f70afcfb32"
Cache-Control: max-age=0, private, must-revalidate

3
583
0

68585 Disconnected

120000 **STATUS POSTs=2 connectFAIL=0 discWAIT=0
129262 XBee RX/ACK
129330 Connected to server
129341 POST 2093,3,71.0
129463 Server response
HTTP/1.1 200 OK
Server: nginx/0.8.53
Date: Sat, 16 Jul 2011 13:12:42 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding
Status: 200
ETag: "cfcd208495d565ef66e7dff9f98764da"
Cache-Control: max-age=0, private, must-revalidate

1
0
0

129533 Disconnected

180000 **STATUS POSTs=3 connectFAIL=0 discWAIT=0
190219 XBee RX/ACK
190287 Connected to server
190299 POST 2094,3,71.0
190425 Server response
HTTP/1.1 200 OK
Server: nginx/0.8.53
Date: Sat, 16 Jul 2011 13:13:43 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding
Status: 200
ETag: "f5deaeeae1538fb6c45901d524ee2f98"
Cache-Control: max-age=0, private, must-revalidate

3
584
0

190496 Disconnected