On reception of a filtered request, your proxy should send back a permission
denied message which has both the HEADER part and the CONTENT part.
The CONTENT part is going to be compared by the test script. For clarification,
the entire HTTP response is printed below:
"HTTP/1.0 403 Forbidden\r\nContent-type: text/html\r\n\r\n<html><head><title>Proxy
Error</title></head>\n<body>You are not allowed to access this