Content delivery network routing method, system and user terminal

A content delivery network (CDN) routing system, wherein the system comprises:

• service router configured to receive a first service request sent by a user terminal, wherein the first service request carries a first uniform resource locator (URL), wherein the first URL is an original URL requested by the user terminal, and a domain name corresponding to the first URL is an original domain name requested by the user terminal;
• and
• a cache node is configured to receive a second service request sent by the user terminal, wherein the second service request carries a second URL, send a third service request to an origin server after receiving the second service request sent by the user terminal, and receive a cookie header field returned by the origin server, wherein the cookie header field comprises cookie information to be provided when the user terminal accesses the original domain name, and return a header field indication to the user terminal, wherein the header field indication carries the cookie information,
• wherein the service router is further configured to return a redirection response message to the user terminal, wherein the redirection response message carries the second URL, wherein a domain name corresponding to the second URL comprises an identifier of a cache node selected by the service router for the user terminal, and the domain name corresponding to the second URL is a child domain name of the original domain name or is at a same level as the original domain name.