Is TCP connection expensive?

TCP also comes with more header data, and maintains the connection state, which will consume resources. So yes, compared to UDP, TCP is more expensive, but expensive is a relative term.

How many connections can a WebSocket server handle?

By default, a single server can handle 65,536 socket connections just because it’s the max number of TCP ports available.

How long do WebSocket connections last?

A WebSocket connection can in theory last forever. Assuming the endpoints remain up, one common reason why long-lived TCP connections eventually terminate is inactivity.

What are the disadvantages of WebSockets?

The disadvantage with using web sockets is that it keeps the connection open on the server for the duration of the time the user is interacting with the page. This will increase the demand on the server, and means that you will always have to scale OUT rather than UP.

Is socket connection expensive?

1 Answer. Creating socket is cheap. Connecting it actually creates the connection, which is more or less as expensive as creating the underlying connection, specially TCP connection.

Are WebSocket connections reliable?

It is worth to mention that WebSockets give us only an illusion of reliability. Unfortunately, the Internet connection itself is not reliable. There are many places when the connection is slow, devices often go offline, and in fact, there is still a need to be backed by a reliable messaging system.

Are WebSockets persistent?

A WebSocket is a persistent connection between a client and server. WebSockets provide a bidirectional, full-duplex communications channel that operates over HTTP through a single TCP/IP socket connection. At its core, the WebSocket protocol facilitates message passing between a client and server.

Is WebSocket more efficient than HTTP?

If WebSockets are used, each user can both send and receive messages in real-time. WebSockets allow for a higher amount of efficiency compared to REST because they do not require the HTTP request/response overhead for each message sent and received.

What is the maximum duration of an idle session?

The session is automatically reestablished when client device activity resumes. A user-defined number of minutes from 0 through 99,999. For this policy setting, a value of 0 means to disconnect an idle session as quickly as is reasonably possible. The maximum value is 99999, which is 208 days.

What is TCP Keepalive timeout?

The TCP user timeout controls how long transmitted data may remain unacknowledged before a connection is forcefully closed. It makes sense: TCP is already trying to elicit a response from the other peer, an empty keepalive would be superfluous. TCP_KEEPCNT The maximum number of keepalive probes TCP should send before dropping the connection.

How much unacknowledged data can a host have in TCP?

Specifically, the amount of unacknowledged data that a host can have within a TCP connection may not exceed the minimum of CongWin and RcvWin , i.e., LastByteSent – LastByteAcked <= min {CongWin, RcvWin}. The threshold, which we discuss in detail below, is a variable that effects how CongWin grows.

What does 0 mean on the idle time limit policy?

For this policy setting, a value of 0 means to disconnect an idle session as quickly as is reasonably possible. The maximum value is 99999, which is 208 days. In effect, this value disables the policy.