The WebSocket Protocol - The Definitive Guide to HTML5 WebSocket - page 48

Table 3-4. ( continued )

Code Description When to Use this Code

1009 Message Too Large Send this code when receiving a message that

is too large for your application to handle.
(Remember, frames can have payload lengths
up to 64 bits long. Even if you have a big server,
some messages are still too large.)

1010 Extension Required Send this code from the client (browser) when

your application requires one or more specific
extensions that the server did not negotiate.

1011 Unexpected Condition Send this code when your application cannot

continue handling the connection for an
unforeseen reason.

1015 TLS Failure (reserved) Do not send this code. The WebSocket API uses

this code to indicate when TLS has failed before
the WebSocket handshake.

■ Chapter 2 describes how the WebSocket API uses the close codes. For additional
information about the WebSocket API, see http://www.w3.org/TR/websockets/ .

Note

Other code ranges are reserved for specific purposes. Table 3-5 lists the four
categories of close codes defined in RFC 6455.