Hi I have a cgi controller that takes requests and depending on request it invokes the object of the desired class which generates a XML and sends the XML as a response. On the client this XML is combined with XSL to display a HTML page. For ex. Code: request---->controller------->router.cgi(a linked list of name value pair is generated and passed to XML.c)-------->XML(using libxml library )-------->client(XML+XSL=HTML). My problem is that if anybody prints something to debug a code that goes as a response since I am using print to send response and the XML breaks. How can I debug my code without breaking the XML. Please suggest an approach or a framework that can be employed here.