All symptoms of leg pain caused by the conditions listed above are often referred to as sciatica. This is because the pain often radiates along the sciatic nerve, which originates with certain nerve roots in the low back and runs through the back of each leg into the foot.
Trackback - A method by which a blogger receives notification which other bloggers link to his or her blog entry
HTTP response header is the information that a Web server sends back to a client's browser in response to receiving an HTTP request.