What are the Web servers doing?

As a web developer, we should definitely know what the Web server is doing, and here's a quick list of the time and details.

(1) Establish a connection--accept a client connection.

(2) Receive a request-reads an HTTP request message from the network.

(3) Processing the request-interpreting the request message and taking action (the procedure above is not implemented).

(4) Access to resources-access the resources specified in the message (the program above is not implemented).

(5) Build response--Create an HTTP response message with the correct header.

(6) Send response--sends the response back to the client.

(7) Record the transaction process-records the contents of the completed transaction in a single log file.

What are the Web servers doing?