# class HTTP::WebSocket

- HTTP::WebSocket
- Reference
- Object

##
Overview

NOTE To use `WebSocket`, you must explicitly import it with `require "http/web_socket"`

##
Defined in:

http/web_socket.cr

##
Constructors

- .new(host : String, path : String, port = nil, tls : HTTP::Client::TLSContext = nil, headers = HTTP::Headers.new)

  Opens a new websocket to the target host.

- .new(uri : URI | String, headers = HTTP::Headers.new)

  Opens a new websocket using the information provided by the URI.

##
Instance Method Summary

- #close(code : CloseCode | Int | Nil = nil, message = nil) : Nil

  Sends a close frame, and closes the connection.

- #closed? : Bool
- #on_binary(&on_binary : Bytes -> )

  Called when a binary message is received.

- #on_close(&on_close : CloseCode, String -> )

  Called when the connection is closed by the other party.

- #on_message(&on_message : String -> )

  Called when a text message is received.

- #on_ping(&on_ping : String -> )

  Called when a PING frame is received.

- #on_pong(&on_pong : String -> )

  Called when a PONG frame is received.

- #ping(message = nil)

  Sends a PING frame.

- #pong(message = nil) : Nil

  Sends a PONG frame, which must be in response to a previously received PING frame from `#on_ping`.

- #run : Nil

  Continuously receives messages and calls previously set callbacks until the websocket is closed.

- #send(message) : Nil

  Sends a message payload (message).

- #stream(binary = true, frame_size = 1024, &)

  Streams data into io until the io is flushed and sent as a message.

### Instance methods inherited from class `Reference`

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, initialize initialize, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference) : Bool
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

### Constructor methods inherited from class `Reference`

new new, unsafe_construct(address : Pointer, *args, **opts) : self unsafe_construct

### Class methods inherited from class `Reference`

pre_initialize(address : Pointer) pre_initialize

### Instance methods inherited from class `Object`

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

### Class methods inherited from class `Object`

from_json(string_or_io, root : String)
from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml

### Macros inherited from class `Object`

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

##
Constructor Detail

def self.new(host : String, path : String, port = nil, tls : HTTP::Client::TLSContext = nil, headers = HTTP::Headers.new) #

Opens a new websocket to the target host. This will also handle the handshake and will raise an exception if the handshake did not complete successfully.

    require "http/web_socket"

    HTTP::WebSocket.new("websocket.example.com", "/chat")            # Creates a new WebSocket to `websocket.example.com`
    HTTP::WebSocket.new("websocket.example.com", "/chat", tls: true) # Creates a new WebSocket with TLS to `ẁebsocket.example.com`

def self.new(uri : URI | String, headers = HTTP::Headers.new) #

Opens a new websocket using the information provided by the URI. This will also handle the handshake and will raise an exception if the handshake did not complete successfully. This method will also raise an exception if the URI is missing the host and/or the path.

Please note that the scheme will only be used to identify if TLS should be used or not. Therefore, schemes apart from `wss` and `https` will be treated as the default which is `ws`.

    require "http/web_socket"

    HTTP::WebSocket.new(URI.parse("ws://websocket.example.com/chat"))        # Creates a new WebSocket to `websocket.example.com`
    HTTP::WebSocket.new(URI.parse("wss://websocket.example.com/chat"))       # Creates a new WebSocket with TLS to `websocket.example.com`
    HTTP::WebSocket.new(URI.parse("http://websocket.example.com:8080/chat")) # Creates a new WebSocket to `websocket.example.com` on port `8080`
    HTTP::WebSocket.new(URI.parse("ws://websocket.example.com/chat"),        # Creates a new WebSocket to `websocket.example.com` with an Authorization header
      HTTP::Headers{"Authorization" => "Bearer authtoken"})
    HTTP::WebSocket.new(
      URI.parse("ws://user:password@websocket.example.com/chat")) # Creates a new WebSocket to `websocket.example.com` with an HTTP basic auth Authorization header

##
Instance Method Detail

def close(code : CloseCode | Int | Nil = nil, message = nil) : Nil #

Sends a close frame, and closes the connection. The close frame may contain a body (message) that indicates the reason for closing.

def closed? : Bool #
def on_binary(&on_binary : Bytes -> ) #

Called when a binary message is received.

def on_close(&on_close : CloseCode, String -> ) #

Called when the connection is closed by the other party.

def on_message(&on_message : String -> ) #

Called when a text message is received.

def on_ping(&on_ping : String -> ) #

Called when a PING frame is received.

def on_pong(&on_pong : String -> ) #

Called when a PONG frame is received.

An unsolicited PONG frame should not be responded to.

def ping(message = nil) #

Sends a PING frame. Received pings will call `#on_ping`.

The receiving party must respond with a PONG.

def pong(message = nil) : Nil #

Sends a PONG frame, which must be in response to a previously received PING frame from `#on_ping`.

def run : Nil #

Continuously receives messages and calls previously set callbacks until the websocket is closed. Ping and pong messages are automatically handled.

    # Open websocket connection
    ws = HTTP::WebSocket.new("websocket.example.com", "/chat")

    # Set callback
    ws.on_message do |msg|
      ws.send "response"
    end

    # Start infinite loop
    ws.run

def send(message) : Nil #

Sends a message payload (message).

def stream(binary = true, frame_size = 1024, &) #

Streams data into io until the io is flushed and sent as a message.

The method accepts a block with an `io` argument. The io object can call on `IO#write` and `IO#flush` method. The `write` method accepts `Bytes` (`Slice(UInt8)`) and sends the data in chunks of frame_size bytes. The `flush` method sends all the data in io and resets it. The remaining data in it is sent as a message when the block is finished executing. For further information, see the `HTTP::WebSocket::Protocol::StreamIO` class.

    # Open websocket connection
    ws = HTTP::WebSocket.new("websocket.example.com", "/chat")

    # Open stream
    ws.stream(false) do |io|
      io.write "Hello, ".encode("UTF-8") # Sends "Hello, " to io
      io.flush                           # Sends "Hello, " to the socket
      io.write "world!".encode("UTF-8")  # Sends "world!" to io
    end
    # Sends "world!" to the socket