Patent ID: 9379952
Filing Date: 2016-06-28
CPC Classification: H04L

Claim Text:
1. A method performed in a web browser, the method comprising: dereferencing a Uniform Resource Identifier (URI) comprising a web resource and a reflex tag; creating a request message comprising a request for the web resource and a reflex request corresponding to the reflex tag, wherein the reflex request is a request for address and port information from a web server comprising the web resource; encapsulating the request message in a transport message comprising an Internet Protocol (IP) address and a port of the web browser; transmitting the transport message to the web server; receiving a response message from the web server, wherein the response message comprises a second IP address and a second port number of the browser as seen by the web server, wherein the second IP address and the second port number is the requested address and port information, and wherein the response message further comprises at least a part of the web resource; and determining a characteristic of at least one Network Address Translation (NAT) device coupled between the web browser and the web server based on the second IP address and the second port number.