the Socket#use() method is removed (see 5c73733)
Socket#join() and Socket#leave() do not accept a callback argument anymore.
Before:
socket.join("room1", () => {
io.to("room1").emit("hello");
});
After:
socket.join("room1");
io.to("room1").emit("hello");
// or await socket.join("room1"); for custom adapters
Before:
new Server(3000, {
origins: ["https://example.com"]
});
The 'origins' option was used in the allowRequest method, in order to determine whether the request should pass or not. And the Engine.IO server would implicitly add the necessary Access-Control-Allow-xxx headers.
After:
new Server(3000, {
cors: {
origin: "https://example.com",
methods: ["GET", "POST"],
allowedHeaders: ["content-type"]
}
});
The already existing 'allowRequest' option can be used for validation:
new Server(3000, {
allowRequest: (req, callback) => {
callback(null, req.headers.referer.startsWith("https://example.com"));
}
});
Socket#rooms is now a Set instead of an object
Namespace#connected is now a Map instead of an object
there is no more implicit connection to the default namespace:
// client-side
const socket = io("/admin");
// server-side
io.on("connect", socket => {
// not triggered anymore
})
io.use((socket, next) => {
// not triggered anymore
});
io.of("/admin").use((socket, next) => {
// triggered
});
This method was kept for backward-compatibility with pre-1.0 versions.
the Socket#use() method is removed (see 5c73733)
Socket#join() and Socket#leave() do not accept a callback argument anymore.
Before:
socket.join("room1", () => {
io.to("room1").emit("hello");
});
After:
socket.join("room1");
io.to("room1").emit("hello");
// or await socket.join("room1"); for custom adapters
Before:
new Server(3000, {
origins: ["https://example.com"]
});
The 'origins' option was used in the allowRequest method, in order to determine whether the request should pass or not. And the Engine.IO server would implicitly add the necessary Access-Control-Allow-xxx headers.
After:
new Server(3000, {
cors: {
origin: "https://example.com",
methods: ["GET", "POST"],
allowedHeaders: ["content-type"]
}
});
The already existing 'allowRequest' option can be used for validation:
new Server(3000, {
allowRequest: (req, callback) => {
callback(null, req.headers.referer.startsWith("https://example.com"));
}
});
Socket#rooms is now a Set instead of an object
Namespace#connected is now a Map instead of an object
there is no more implicit connection to the default namespace:
// client-side
const socket = io("/admin");
// server-side
io.on("connect", socket => {
// not triggered anymore
})
io.use((socket, next) => {
// not triggered anymore
});
io.of("/admin").use((socket, next) => {
// triggered
});
This method was kept for backward-compatibility with pre-1.0 versions.