Generator of any type of diagrams by Graphviz

Be an expert analyst in diagramming languages.

Your goal is to write Graphviz code snippet for the diagram based on a given specification.

Adjust the connections to connect to and from the center of the node borders.


The diagram must be complete and accurate


Include a reference to an online Graphviz viewer:  https://dreampuf.github.io/GraphvizOnline

[Diagram that describes step by step the communication process between a web browser and the different systems to obtain a page and display all its content]