SocketReadyQ

tests if there is any data immediately available to read from the specified socket.

waits for up to t seconds to see if data becomes available to read.

Details

Sockets in SocketReadyQ[…] are specified using SocketObject[…].
SocketReadyQ returns immediately; unlike Read etc., it does not block waiting for data to become available.
For numeric values, t is interpreted as having units of seconds. A time Quantity can also be used.

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Initially on connection, most websites will not send data until a request is made:

Write a request to the socket and wait for up to 10 seconds for the server's response to arrive:

Close the socket:

Open a server socket and connect a client socket to it:

Initially, neither of them has any data available:

Sending a message to the client makes the socket ready for reading:

After reading the message, there is no more data available:

Close the sockets:

Wait for a response using a Quantity as the second argument:

Close the socket:

Make a simple ping time function, measuring how long it takes for an HTTP response to come back:

Ping a host to see how long before it responds:

Request the page multiple times:

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