Analysis of methods of accessing the server in html (picture and text)

The content of this article is about the analysis (pictures and text) of the method of accessing the server in HTML. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The first is the case of a single server, the second is the case of a cluster server;

The first case is the case of red pointing, The html requests the servlet. After querying the database for verification, the string is returned through the response. On the html side, a local cookie is established. When other pages on the homepage access the server, the string and session are obtained from the local cookie for verification;

The second case is the one pointed by yellow. When there are multiple servers, HTML sends an access request to the database for verification. If the verification is successful, a unique string assembled by key-value will also be returned. However, it is not stored in the server's session, but is stored separately in a key-value type database redis. When other pages on the homepage request verification, it directly retrieves the string from the redis database for verification. Note that the session object is terminated when the entire browser is closed, while the local cookie is cleared from the cache after a certain period of time. Of course, this time can be set by yourself.

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