Methods of Communication

hypertext-transfer-protocol.

• method for transporting data between client and server.
• request/response protocol.
• can be called many times with different outcomes.
• application layer protocol that relies on transmission-control-protocol and user-datagram-protocol.

transmission-control-protocol.

- connection-oriented protocol. - connection is established and terminated using a handshake. - all packets that are sent are guaranteed to reach the destination in order. - good for reliability, but not the most time-efficient. - good for database info, ssh, ftp, etc. - use over user-datagram-protocol when you need all of the data to arrive intact.

user-datagram-protocol.

• connectionless protocol.
  • data packets, called “datagrams”, are sent out and broadcast to all devices in the subnet.
  • no guarantee that packets arrive or arrive in order.
• less reliable but has much lower latency.
• useful for video calls/chat, video games, streaming, etc.

remote-procedure-call.

• a client causes a procedure to be run on a different address space (on a remote server).
  • there is a client stub procedure that is pushed onto a stack, and the communication module sends it to the server.
• often used for internal communications between services, hand-crafted native calls can oftentimes better fit your use case.
• public facing APIs use representational-state-transfer instead.

representational-state-transfer.

• uses GET, POST, PUT, DELETE, and PATCH requests.
• client/server model where the client acts on resources that are managed by the server.
• actions must be stateless and cacheable.
• focused on exposing data.
• great for horizontal-scaling because it is stateless.
• disadvantages.
  • some actions might not fit in the set of REST verbs.
  • complicated/nested data might require multiple round trips.
  • API responses can become bloated as new fields are added to calls that old client calls don’t need.

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References.

Categories:: networking