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nats.docs/developer/connecting/intro.md
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Connecting to NATS

Most client libraries provide several ways to connect to the NATS server. The server itself is identified by a standard URL with the nats protocol. Throughout these examples we will rely on a test server, provided by nats.io, at nats://demo.nats.io:4222, where 4222 is the default port for NATS.

NATS clients also support the tls protocol to indicate that the client wants to use TLS. So in the previous example we can replace nats with tls to get tls://demo.nats.io:4222.

The protocol requirement is being removed from many libraries, so that you can use demo.nats.io:4222 as the URL and let the client and server resolve whether or not TLS is required.

There are numerous options for a NATS connections ranging from timeouts to reconnect settings.