Traditionally, a web Page has to send a request to the server to receive new data; that is, the Page requests data from the server. With server-sent events, it's possible for a server to send new data to a web Page at any time, by pushing messages to the web Page. These incoming messages can be treated as Events + data inside the web Page.... Traditionally, a web page has to send a request to the...receive new data; that is, the page requests data from the server...