[squid-users] strange problem in squid with certain sites and strange log

Hello,

I'm running squid 3.1.19 in tproxy mode, and I have some customers
complaining that they have problem with stock exchange (share market) sites
and software after implementing the squid. What I saw in the access.log for
one of the customers is:

10.21.8.59 - - [04/Jul/2012:12:01:56 +0530] "GET
http://login.angeltrade.com/AngeltradeDiet/DietOdinSingleInterface.asp?
HTTP/1.1" 200 3557 TCP_MISS:DIRECT
10.21.8.59 - - [04/Jul/2012:12:01:57 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:01:59 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:00 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:01 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:02 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:03 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:04 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:06 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:07 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:08 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:09 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:10 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:11 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE
10.21.8.59 - - [04/Jul/2012:12:02:12 +0530] "NONE error:invalid-request
HTTP/0.0" 400 4021 NONE:NONE

What would this mean?

What can I do to further investigate the case and probably resolve it...

Any help would be appreciated.

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