Bad HTTP request on calling a xacute query as URL

Hi Experts,

I am getting calling a xacute qury using the URL and passign a xml to it

http://<server>:50000/XMII/Illuminator?QueryTemplate=<TrxPath>&Content-Type=text/xml&

Param.1=%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22UTF-8%22%20%3F%3E%3CRowsets%3E%3CRowset%3E%3CColumns%3E%3CColumn%20Description%3D%22DELIVERYID%22%20Name%3D%22DELIVERYID%22%20SourceColumn%3D%22DELIVERYID%22%20%2F%3E%3CColumn%20Description%3D%22MATERIALID%22%20Name%3D%22MATERIALID%22%20SourceColumn%3D%22MATERIALID%22%20%2F%3E%3CColu ..................... etc

When the length of the XML exceeds a certain length, I am getting the following error.

400 Bad HTTP request

Bad HTTP request

---

Error: -21 Version: 7200 Component: HTTP_FILTER Date/Time: Thu Dec 04 11:05:54 2014 Module: http_auth.c Line: 587 Server: JAZMIIPROD_MIP_00 Error Tag: {0008d2c2} Detail: illegal request © 2001-2009, SAP AG

Please advise,

Regards

Maaz