*malformed status 1* @WLS plugin

hi all,
we are facing this kind of error in webserver site
we spent two weeks in googling , but no enoug resources,
could you please give a detail , when this error happens,
[Fri Mar 20 22:04:59 2013] [error] [client ******] ap_proxy: trying POST ***** at backend host ****/***; got exception 'PROTOCOL_ERROR [line 848 of ../nsapi/URL.cpp]: malformed status 1', referer: https://*****/*******
errlog says...
wls-plugin log
Wed Mar 20 22:04:59 2013 <5072513638098992299> *******Exception type [PROTOCOL_ERROR] (malformed status 1) raised at line 848 of ../nsapi/URL.cpp
Wed Mar 20 22:04:59 2013 <5072513638098992299> sendRequest: exception caught while parsingHeaders w/ recycled connection to 10.210.50.219:55515, numfailures=1
Wed Mar 20 22:04:59 2013 <5072513638098992299> Marking ***** as bad
Wed Mar 20 22:04:59 2013 <5072513638098992299> got exception in sendRequest phase: PROTOCOL_ERROR [line 848 of ../nsapi/URL.cpp]: malformed status 1 at line 3160
Wed Mar 20 22:04:59 2013 <5072513638098992299> NOT failing over after sendRequest() exception: PROTOCOL_ERROR
Wed Mar 20 22:04:59 2013 <5072513638098992299> Redirecting the error response to the errorPage = [****]
Wed Mar 20 22:04:59 2013 <5072513638098992299> request [****] did NOT process successfully..................

We were able to avoid the PROTOCOL_ERROR by turning off the connection pooling in obj.conf (KeepAliveEnabled="false"). We're using Weblogic 8.1.5 and testing on 8.1.6, where the error still seems to exist. This issue is only occuring with IE 6 & 7 with pooled connections. FireFox doesn't seem to have any issues with the pooled connections at all. This is not an optimal workaround for us when we go to production because of the likely performance implications turning off the pooling will have.
I can't see anything in the request headers coming from the two different browsers that looks conspicuous...they're almost identical. Is there any kind of user agent specific processing going on in the plugin that could be causing something like this?

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