컨트롤러 does as a role of interface that receive an incoming request and return the data. Controllers classify the requests with a mechanism of endpoint routing.
Request
The req object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on.
In computing, a legacy system is an old method, technology, computer system, or application program, "of, relating to, or being a pervious or outdated computer system", yet stil in use.
Datagram
A datagram refers to a self-contained, independent unit of data that is trasmitted over a netwrok. Datagrams are used to send data between different nodes on a network, such as computers or servers.
_ A datagram typically consists of a header and a payload. The header contains information such as the source and destination address, protocol type, and packet lenghth. The payload contains the actual data being transmitted.
How does a datagram work?
Datagrams are an efficient and reliable way to transmit data over a network, as they allow for large amounts of data to be broken up into smaller, more manageable pieces. When a datagram is sent, it is broken up into smaller pieces, or packets, that are transmitted individually across the network. Each packet contains a portion of the datagram payload, along with the necessarty header information.
When the packets reach their destination, they are reassembled into the original datagram by the receiving device. This process is handled by the network protocol used, typically the internet Protocol (IP_ or the Use Datagram Protocol (UDP) in the case of the internet.
self-contained(adjective)
_ containing or having everything that is needed within itself:
- The apartment is small, but completely self-contained, with its own bathroom, kitchen, and living area.
(필요한) 모든 걸 갖춘
A self-continaed person does not have a large number of relationships with other people or does not depend on others for support:
- She's very self-contained and isn't at all worried about moving to a big city where she won't know anybody.
"주체적인" "독립적인"
