Problem with iRule ProxyPass v10 and "/" URI

Yes, it's correct. We have made ssldump between the client and the F5 and we didn't see the cookie in the POST request. So the client don't send the cookie. As the iRule rewrite the response before to send it to the client, I think there is a problem with the rewrite rule when we have a path "/". When the content lengh is less than 500 ko with the path "/", it's working but the cookie is not present (as when the content lenght is more than 500 ko).

There is an example : with the path "/" :

POST /start.swe HTTP/1.1 Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, / Referer: https://192.168.200.59/start.swe Accept-Language: fr-FR User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E) Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip, deflate Host: 192.54.200.59 Content-Length: 659 Connection: Keep-Alive Cache-Control: no-cache

with the path "/ent" :

POST /ent/start.swe HTTP/1.1 Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, / Referer: https://192.168.200.59/ent/start.swe?SWEField=s_4_1_8_0&SWENeedContext=true&SWESP=false&SWERowIds=&SWEMethod=NewRecord&SWECmd=InvokeMethod&SWEVI=&SWEPOC=&SWETargetView=&SWEDIC=false&SWEReqRowId=0&SWEView=CRMWE7+Saisie+OC+VVENTABD+Creation+View&SWETVI=&SWERowId=&SWEC=3&SWEM=&SWEBID=-1&SWESPa=&SWEContainer=&SWETS=&SWETA=&SWEApplet=CRMWE7+OC+RSP+Creation+Form+Applet&SWETS=1391697689072&SWEC=3&SWENoHttpRedir=true Accept-Language: fr-FR User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E) Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip, deflate Host: 192.168.200.59 Content-Length: 579 Connection: Keep-Alive Cache-Control: no-cache Cookie: sn=8bU9RNnaRJjJttXPViTrzkZCH135Tf-Pl0lQ5mfutHU

Thanks for your help