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MDS caching

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Old 05-06-2009, 12:26 AM   #1 (permalink)
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Default MDS caching

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We have just started porting of a Java ME application. The Java ME application communicates with a server by using HTTP POST messages. We use the JDE 4.6 with the corresponding MDS which proxy our POST messages to the server. Unfortunately not all messages are received by the server and sometime the client get a 404 response:

My debug log in JDE:

Code:
...
05-06 04:53:14 [DEBUG] no.mbricks.net.transport.http.HTTPClientTransport - Connection got response code: 200
05-06 04:53:14 [INFO] no.mbricks.net.transport.http.HTTPClientTransport - Receiving 42 bytes from the network
05-06 04:53:14 [DEBUG] no.mbricks.net.protocol.Protocol - Data received in protocol with length: 42
05-06 04:53:14 [DEBUG] no.mbricks.net.protocol.Protocol - Packet received from client 0
05-06 04:53:14 [DEBUG] no.mbricks.net.protocol.Protocol - Packet size: 42
05-06 04:53:14 [DEBUG] no.mbricks.net.protocol.Protocol - Getting packet type
...
05-06 04:53:14 [INFO] no.mbricks.framework.net.PlatformMessage - Sending PlatformMessage
05-06 04:53:14 [DEBUG] no.mbricks.net.transport.Transport - Sending keepAlivePacket
05-06 04:53:14 [DEBUG] no.mbricks.net.transport.Transport - Sending packets 48
05-06 04:53:15 [DEBUG] no.mbricks.net.transport.http.HTTPClientTransport - Connection got response code: 404
05-06 04:53:16 [DEBUG] no.mbricks.net.transport.Transport - Sending keepAlivePacket
...
In the MDS log I find:

Code:
...
<2009-05-06 06:53:14.175 CEST>:[189]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, ERRORMSG = Invalid, DEVICEPIN:CONNECTIONID = 2100000a:1534984737, SEQUENCE =
1, Information = Received Packet for a timed out connection>
...
My question is: Do anybody know if there is some kind of caching in the MDS that would stop similar client requests from getting to the end server?

Is there any explanation about the 404 error?
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Old 05-06-2009, 08:46 AM   #2 (permalink)
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Have you tried a direct TCP connection from the simulator? This bypasses the MDS-CS proxy and might help you isolate the issue.

MDS does proxy and cache everything - it is very aggravating sometimes.

Make sure you have something like this in your HTT header properties:

httpConnection.setRequestProperty("If-Modified-Since", "29 Oct 1999 19:43:31 GMT");
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Old 05-07-2009, 02:19 AM   #3 (permalink)
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Default MDS stopping HTTP POSTs
I open my HTTP connection like this:

Code:
HttpConnection connection = (HttpConnection) Connector.open(URL+URI, Connector.READ_WRITE);
connection.setRequestMethod(HttpConnection.POST);
connection.setRequestProperty("Content-Type", "application/octet-stream");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("Cache-Control", "no-cache");
connection.setRequestProperty("Pragma", "no-cache");		
connection.setRequestProperty("If-Modified-Since", "29 Oct 1999 19:43:31 GMT");
I see that the MDS gets the POSTs, but it simply does not send it to the server on the other end!

From MDS log:
Code:
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION =>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = [Transmission Line Section]:>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = POST /SuperOfficeServer/servlet HTTP/1.1>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = [Headers Section]: 8 headers>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Content-Type:application/octet-stream>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Pragma:no-cache>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Connection:Keep-Alive>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Cache-Control:no-cache>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = x-rim-conttime:10000>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = If-Modified-Since:fr, 29 okt 1999 19:43:31 GMT>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Host:85.19.158.214:8180>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = Content-Length:16>
<2009-05-07 09:16:33.441 CEST>:[1001]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = ReceivedFromDevice, DEVICEPIN = 2100000a, CONNECTION
ID = 340565671, HTTPTRANSMISSION = [Parameters Section]: 0 parameters>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION =>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = [Transmission Line Section]:>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = POST /SuperOfficeServer/servlet HTTP/1.1>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = [Headers Section]: 11 headers>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = Connection:Keep-Alive>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = x-rim-original-accept:*/*>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = Accept:*/*>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = Content-Length:16>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = Pragma:no-cache>
<2009-05-07 09:16:33.480 CEST>:[1002]:<MDS-CS_MDS>:<DEBUG>:<LAYER = IPPP, HANDLER = HTTP, EVENT = SentToServer, DEVICEPIN = 2100000a, CONNECTIONID = 3
40565671, HTTPTRANSMISSION = Cache-Control:no-cache>
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Old 05-07-2009, 07:14 AM   #4 (permalink)
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In debugger I see that it never returns from this method.

Code:
is = connection.openInputStream();
After a while it gets interrupt exception. The server dosen't get a POST either.
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Old 05-08-2009, 02:11 AM   #5 (permalink)
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Default Problem solved!
I found that the MDS was caching my response object. To prevent this I had to specify:

Code:
// Prevent response from being cached by a proxy server
response.addHeader("Pragma", "No-Cache");
response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
response.addHeader("Cache-Control", "pre-check=0, post-check=0");
response.setDateHeader("Expires", 0);
Anybody knows the reason from why the MDS is caching response objects?
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