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0000000000..447d432c54 --- /dev/null +++ b/docs/engine.io-protocol/v3-test-suite/test-suite.js @@ -0,0 +1,595 @@ +const isNodejs = typeof window === "undefined"; + +if (isNodejs) { + // make the tests runnable in both the browser and Node.js + await import("./node-imports.js"); +} + +const { expect } = chai; + +const URL = "http://localhost:3000"; +const WS_URL = URL.replace("http", "ws"); + +const PING_INTERVAL = 300; +const PING_TIMEOUT = 200; + +function sleep(delay) { + return new Promise((resolve) => setTimeout(resolve, delay)); +} + +function waitFor(socket, eventType) { + return new Promise((resolve) => { + socket.addEventListener( + eventType, + (event) => { + resolve(event); + }, + { once: true } + ); + }); +} + +function decodePayload(payload) { + const firstColonIndex = payload.indexOf(":"); + const length = payload.substring(0, firstColonIndex); + const packet = payload.substring(firstColonIndex + 1); + return [length, packet]; +} + +async function initLongPollingSession(supportsBinary = false) { + const response = await fetch(`${URL}/engine.io/?EIO=3&transport=polling` + (supportsBinary ? "" : "&b64=1")); + const text = await response.text(); + const [, content] = decodePayload(text); + return JSON.parse(content.substring(1)).sid; +} + +describe("Engine.IO protocol", () => { + describe("handshake", () => { + describe("HTTP long-polling", () => { + it("successfully opens a session", async () => { + const response = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling` + ); + + expect(response.status).to.eql(200); + + const text = await response.text(); + const [length, content] = decodePayload(text); + + expect(length).to.eql(content.length.toString()); + expect(content).to.startsWith("0"); + + const value = JSON.parse(content.substring(1)); + + expect(value.sid).to.be.a("string"); + expect(value.upgrades).to.eql(["websocket"]); + expect(value.pingInterval).to.eql(PING_INTERVAL); + expect(value.pingTimeout).to.eql(PING_TIMEOUT); + expect(value.maxPayload).to.be.oneOf([undefined, 1000000]); + }); + + it("fails with an invalid 'transport' query parameter", async () => { + const response = await fetch(`${URL}/engine.io/?EIO=3`); + + expect(response.status).to.eql(400); + + const response2 = await fetch(`${URL}/engine.io/?EIO=3&transport=abc`); + + expect(response2.status).to.eql(400); + }); + + it("fails with an invalid request method", async () => { + const response = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling`, + { + method: "post", + } + ); + + expect(response.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("successfully opens a session", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.startsWith("0"); + + const value = JSON.parse(data.substring(1)); + + expect(value.sid).to.be.a("string"); + expect(value.upgrades).to.eql([]); + expect(value.pingInterval).to.eql(PING_INTERVAL); + expect(value.pingTimeout).to.eql(PING_TIMEOUT); + expect(value.maxPayload).to.be.oneOf([undefined, 1000000]); + + socket.close(); + }); + + it("fails with an invalid 'EIO' query parameter", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?transport=websocket` + ); + + if (isNodejs) { + socket.on("error", () => {}); + } + + waitFor(socket, "close"); + + const socket2 = new WebSocket( + `${WS_URL}/engine.io/?EIO=abc&transport=websocket` + ); + + if (isNodejs) { + socket2.on("error", () => {}); + } + + waitFor(socket2, "close"); + }); + + it("fails with an invalid 'transport' query parameter", async () => { + const socket = new WebSocket(`${WS_URL}/engine.io/?EIO=3`); + + if (isNodejs) { + socket.on("error", () => {}); + } + + waitFor(socket, "close"); + + const socket2 = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=abc` + ); + + if (isNodejs) { + socket2.on("error", () => {}); + } + + waitFor(socket2, "close"); + }); + }); + }); + + describe("message", () => { + describe("HTTP long-polling", () => { + it("sends and receives a payload containing one plain text packet", async () => { + const sid = await initLongPollingSession(); + + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "6:4hello", + } + ); + + expect(pushResponse.status).to.eql(200); + + const postContent = await pushResponse.text(); + + expect(postContent).to.eql("ok"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + expect(pollContent).to.eql("6:4hello"); + }); + + it("sends and receives a payload containing several plain text packets", async () => { + const sid = await initLongPollingSession(); + + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "6:4test16:4test26:4test3", + } + ); + + expect(pushResponse.status).to.eql(200); + + const postContent = await pushResponse.text(); + + expect(postContent).to.eql("ok"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + expect(pollContent).to.eql("6:4test16:4test26:4test3"); + }); + + it("sends and receives a payload containing plain text and binary packets (base64 encoded)", async () => { + const sid = await initLongPollingSession(); + + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "6:4hello10:b4AQIDBA==", + } + ); + + expect(pushResponse.status).to.eql(200); + + const postContent = await pushResponse.text(); + + expect(postContent).to.eql("ok"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + expect(pollContent).to.eql("6:4hello10:b4AQIDBA=="); + }); + + it("sends and receives a payload containing plain text and binary packets (binary)", async () => { + const sid = await initLongPollingSession(true); + + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "6:4hello10:b4AQIDBA==", + } + ); + + expect(pushResponse.status).to.eql(200); + + const postContent = await pushResponse.text(); + + expect(postContent).to.eql("ok"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const buffer = await pollResponse.arrayBuffer(); + + // 0 => string + // 6 => byte length + // 255 => delimiter + // 52 => 4 (MESSAGE packet type) + // 104 101 108 108 111 => "hello" + // 1 => binary + // 5 => byte length + // 255 => delimiter + // 4 => 4 (MESSAGE packet type) + // 1 2 3 4 => binary message + expect(buffer).to.eql(Uint8Array.from([0, 6, 255, 52, 104, 101, 108, 108, 111, 1, 5, 255, 4, 1, 2, 3, 4]).buffer); + }); + + it("closes the session upon invalid packet format", async () => { + const sid = await initLongPollingSession(); + + try { + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "abc", + } + ); + + expect(pushResponse.status).to.eql(400); + } catch (e) { + // node-fetch throws when the request is closed abnormally + } + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(400); + }); + + // FIXME CORS error + it.skip("closes the session upon duplicate poll requests", async () => { + const sid = await initLongPollingSession(); + + const pollResponses = await Promise.all([ + fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`), + sleep(5).then(() => fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}&t=burst`)), + ]); + + expect(pollResponses[0].status).to.eql(200); + + const content = await pollResponses[0].text(); + + expect(content).to.eql("1:1"); + + // the Node.js implementation uses HTTP 500 (Internal Server Error), but HTTP 400 seems more suitable + expect(pollResponses[1].status).to.be.oneOf([400, 500]); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(500); + }); + }); + + describe("WebSocket", () => { + it("sends and receives a plain text packet", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "open"); + + await waitFor(socket, "message"); // handshake + + socket.send("4hello"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("4hello"); + + socket.close(); + }); + + it("sends and receives a binary packet", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + socket.binaryType = "arraybuffer"; + + await waitFor(socket, "message"); // handshake + + socket.send(Uint8Array.from([4, 1, 2, 3, 4])); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql(Uint8Array.from([4, 1, 2, 3, 4]).buffer); + + socket.close(); + }); + + it("closes the session upon invalid packet format", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // handshake + + socket.send("abc"); + + await waitFor(socket, "close"); + + socket.close(); + }); + }); + }); + + describe("heartbeat", function () { + this.timeout(5000); + + describe("HTTP long-polling", () => { + it("sends ping/pong packets", async () => { + const sid = await initLongPollingSession(); + + for (let i = 0; i < 3; i++) { + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "1:2", + } + ); + + expect(pushResponse.status).to.eql(200); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + expect(pollContent).to.eql("1:3"); + } + }); + + it("closes the session upon ping timeout", async () => { + const sid = await initLongPollingSession(); + + await sleep(PING_INTERVAL + PING_TIMEOUT); + + const pushResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "1:2", + } + ); + + expect(pushResponse.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("sends ping/pong packets", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + const x = await waitFor(socket, "message"); // handshake + + for (let i = 0; i < 3; i++) { + socket.send("2"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("3"); + } + + socket.close(); + }); + + it("closes the session upon ping timeout", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "close"); // handshake + }); + }); + }); + + describe("close", () => { + describe("HTTP long-polling", () => { + it("forcefully closes the session", async () => { + const sid = await initLongPollingSession(); + + const [pollResponse] = await Promise.all([ + fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`), + fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, { + method: "post", + body: "1:1", + }), + ]); + + expect(pollResponse.status).to.eql(200); + + const pullContent = await pollResponse.text(); + + expect(pullContent).to.eql("1:6"); + + const pollResponse2 = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse2.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("forcefully closes the session", async () => { + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // handshake + + socket.send("1"); + + await waitFor(socket, "close"); + }); + }); + }); + + describe("upgrade", () => { + it("successfully upgrades from HTTP long-polling to WebSocket", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + + // send probe + socket.send("2probe"); + + const probeResponse = await waitFor(socket, "message"); + + expect(probeResponse.data).to.eql("3probe"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + expect(pollContent).to.eql("1:6"); // "noop" packet to cleanly end the HTTP long-polling request + + // complete upgrade + socket.send("5"); + + socket.send("4hello"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("4hello"); + }); + + it("ignores HTTP requests with same sid after upgrade", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + + socket.send("2probe"); + const res = await waitFor(socket, "message"); + expect(res.data).to.eql("3probe"); + + socket.send("5"); + + const pollResponse = await fetch( + `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(400); + + socket.send("4hello"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("4hello"); + }); + + it("ignores WebSocket connection with same sid after upgrade", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + + socket.send("2probe"); + const res = await waitFor(socket, "message"); + expect(res.data).to.eql("3probe"); + + socket.send("5"); + + const socket2 = new WebSocket( + `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket2, "close"); + + socket.send("4hello"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("4hello"); + }); + }); +}); diff --git a/docs/engine.io-protocol/v3.md b/docs/engine.io-protocol/v3.md new file mode 100644 index 0000000000..11a3780f0e --- /dev/null +++ b/docs/engine.io-protocol/v3.md @@ -0,0 +1,545 @@ +# Engine.IO Protocol + +This document describes the Engine.IO protocol. For a reference JavaScript +implementation, take a look at +[engine.io-parser](https://github.com/learnboost/engine.io-parser), +[engine.io-client](https://github.com/learnboost/engine.io-client) +and [engine.io](https://github.com/learnboost/engine.io). + +Table of Contents: + +- [Revision](#revision) +- [Anatomy of an Engine.IO session](#anatomy-of-an-engineio-session) + - [Sample session](#sample-session) + - [Sample session with WebSocket only](#sample-session-with-websocket-only) +- [URLs](#urls) +- [Encoding](#encoding) + - [Packet](#packet) + - [0 open](#0-open) + - [1 close](#1-close) + - [2 ping](#2-ping) + - [3 pong](#3-pong) + - [4 message](#4-message) + - [5 upgrade](#5-upgrade) + - [6 noop](#6-noop) + - [Payload](#payload) +- [Transports](#transports) + - [Polling](#polling) + - [XHR](#xhr) + - [JSONP](#jsonp) + - [WebSocket](#websocket) +- [Transport upgrading](#transport-upgrading) +- [Timeouts](#timeouts) +- [Difference between v2 and v3](#difference-between-v2-and-v3) +- [Test suite](#test-suite) + +## Revision + +This is revision **3** of the Engine.IO protocol. + +The revision 2 can be found here: https://github.com/socketio/engine.io-protocol/tree/v2 + +## Anatomy of an Engine.IO session + +1. Transport establishes a connection to the Engine.IO URL . +2. Server responds with an `open` packet with JSON-encoded handshake data: + - `sid` session id (`String`) + - `upgrades` possible transport upgrades (`Array` of `String`) + - `pingTimeout` server configured ping timeout, used for the client + to detect that the server is unresponsive (`Number`) + - `pingInterval` server configured ping interval, used for the client + to detect that the server is unresponsive (`Number`) +3. Server must respond to periodic `ping` packets sent by the client +with `pong` packets. +4. Client and server can exchange `message` packets at will. +5. Polling transports can send a `close` packet to close the socket, since +they're expected to be "opening" and "closing" all the time. + +### Sample session + +- Request n°1 (open packet) + +``` +GET /engine.io/?EIO=3&transport=polling&t=N8hyd6w +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +96:0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000} +``` + +Details: + +``` +96 => number of characters (not bytes) +: => separator +0 => "open" packet type +{"sid":... => the handshake data +``` + +Note: the `t` query param is used to ensure that the request is not cached by the browser. + +- Request n°2 (message in): + +`socket.send('hey')` is executed on the server: + +``` +GET /engine.io/?EIO=3&transport=polling&t=N8hyd7H&sid=lv_VI97HAXpY6yYWAAAC +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +4:4hey +``` + +Details: + +``` +4 => number of characters +: => separator +4 => "message" packet type +hey => the actual message +``` + +- Request n°3 (message out) + +`socket.send('hello'); socket.send('world');` is executed on the client: + +``` +POST /engine.io/?EIO=3&transport=polling&t=N8hzxke&sid=lv_VI97HAXpY6yYWAAAC +> Content-Type: text/plain; charset=UTF-8 +6:4hello6:4world +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +ok +``` + +Details: + +``` +6 => number of characters of the 1st packet +: => separator +4 => "message" packet type +hello => the 1st message +6 => number of characters of the 2nd packet +: => separator +4 => "message" message type +world => the 2nd message +``` + +- Request n°4 (WebSocket upgrade) + +``` +GET /engine.io/?EIO=3&transport=websocket&sid=lv_VI97HAXpY6yYWAAAC +< HTTP/1.1 101 Switching Protocols +``` + +WebSocket frames: + +``` +< 2probe => probe request +> 3probe => probe response +> 5 => "upgrade" packet type +> 4hello => message (not concatenated) +> 4world +> 2 => "ping" packet type +< 3 => "pong" packet type +> 1 => "close" packet type +``` + +### Sample session with WebSocket only + +In that case, the client only enables WebSocket (without HTTP polling). + +``` +GET /engine.io/?EIO=3&transport=websocket +< HTTP/1.1 101 Switching Protocols +``` + +WebSocket frames: + +``` +< 0{"sid":"lv_VI97HAXpY6yYWAAAC","pingInterval":25000,"pingTimeout":5000} => handshake +< 4hey +> 4hello => message (not concatenated) +> 4world +< 2 => "ping" packet type +> 3 => "pong" packet type +> 1 => "close" packet type +``` + + +## URLs + +An Engine.IO url is composed as follows: + +``` +/engine.io/[?] +``` + +- The `engine.io` pathname should only be changed by higher-level + frameworks whose protocol sits on top of engine's. + +- The query string is optional and has six reserved keys: + + - `transport`: indicates the transport name. Supported ones by default are + `polling`, `websocket`. + - `j`: if the transport is `polling` but a JSONP response is required, `j` + must be set with the JSONP response index. + - `sid`: if the client has been given a session id, it must be included + in the querystring. + - `b64`: if the client doesn't support XHR2, `b64=1` is sent in the query string + to signal the server that all binary data should be sent base64 encoded. + - `EIO`: the version of the protocol + - `t`: a hashed-timestamp used for cache-busting + +*FAQ:* Is the `/engine.io` portion modifiable? + +Provided the server is customized to intercept requests under a different +path segment, yes. + +*FAQ:* What determines whether an option is going to be part of the path +versus being encoded as part of the query string? In other words, why +is the `transport` not part of the URL? + +It's convention that the path segments remain *only* that which allows to +disambiguate whether a request should be handled by a given Engine.IO +server instance or not. As it stands, it's only the Engine.IO prefix +(`/engine.io`) and the resource (`default` by default). + +## Encoding + +There's two distinct types of encodings + +- packet +- payload + +### Packet + +An encoded packet can be UTF-8 string or binary data. The packet encoding format for a string is as follows + +``` +[] +``` +example: +``` +2probe +``` +For binary data the encoding is identical. When sending binary data, the packet +type id is sent in the first byte of the binary contents, followed by the +actual packet data. Example: + +``` +4|0|1|2|3|4|5 +``` + +In the above example each byte is separated by a pipe character and shown as an +integer. So the above packet is of type message (see below), and contains +binary data that corresponds to an array of integers with values 0, 1, 2, 3, 4 +and 5. + +The packet type id is an integer. The following are the accepted packet +types. + +#### 0 open + +Sent from the server when a new transport is opened (recheck) + +#### 1 close + +Request the close of this transport but does not shutdown the connection itself. + +#### 2 ping + +Sent by the client. Server should answer with a pong packet containing the same data + +example +1. client sends: ```2probe``` +2. server sends: ```3probe``` + +#### 3 pong + +Sent by the server to respond to ping packets. + +#### 4 message + +actual message, client and server should call their callbacks with the data. + +##### example 1 + +1. server sends: ```4HelloWorld``` +2. client receives and calls callback ```socket.on('message', function (data) { console.log(data); });``` + +##### example 2 + +1. client sends: ```4HelloWorld``` +2. server receives and calls callback ```socket.on('message', function (data) { console.log(data); });``` + +#### 5 upgrade + +Before engine.io switches a transport, it tests, if server and client can communicate over this transport. +If this test succeed, the client sends an upgrade packets which requests the server to flush its cache on +the old transport and switch to the new transport. + +#### 6 noop + +A noop packet. Used primarily to force a poll cycle when an incoming websocket connection is received. + +##### example +1. client connects through new transport +2. client sends ```2probe``` +3. server receives and sends ```3probe``` +4. client receives and sends ```5``` +5. server flushes and closes old transport and switches to new. + +### Payload + +A payload is a series of encoded packets tied together. The payload encoding format is as follows when only strings are sent and XHR2 is not supported: + +``` +:[:[...]] +``` +* length: length of the packet in __characters__ +* packet: actual packets as descriped above + +When XHR2 is not supported, the same encoding principle is used also when +binary data is sent, but it is sent as base64 encoded strings. For the purposes of decoding, an identifier `b` is +put before a packet encoding that contains binary data. A combination of any +number of strings and base64 encoded strings can be sent. Here is an example of +base 64 encoded messages: + +``` +:b[...] +``` + +When XHR2 is supported, a similar principle is used, but everything is encoded +directly into binary, so that it can be sent as binary over XHR. The format is +the following: + +``` +<0 for string data, 1 for binary data>[...] +``` + +If a combination of UTF-8 strings and binary data is sent, the string values +are represented so that each character is written as a character code into a +byte. + +The payload is used for transports which do not support framing, as the polling protocol for example. + +- Example without binary: + +``` +[ + { + "type": "message", + "data": "hello" + }, + { + "type": "message", + "data": "€" + } +] +``` + +is encoded to: + +``` +6:4hello2:4€ +``` + +Please note that we are not counting bytes, but characters, hence 2 (1 + 1) instead of 4 (1 + 3). + +- Example with binary (both the client and the transport support binary): + +``` +[ + { + "type": "message", + "data": "€" + }, + { + "type": "message", + "data": buffer <01 02 03 04> + } +] +``` + +is encoded to: + +``` +buffer <00 04 ff 34 e2 82 ac 01 04 ff 01 02 03 04> + +with: + +00 => string header +04 => string length in bytes +ff => separator +34 => "message" packet type ("4") +e2 82 ac => "€" +01 => binary header +04 => buffer length in bytes +ff => separator +01 02 03 04 => buffer content +``` + +- Example with binary (either the client or the transport does not support binary): + +``` +[ + { + "type": "message", + "data": "€" + }, + { + "type": "message", + "data": buffer <01 02 03 04> + } +] +``` + +is encoded to: + +``` +2:4€10:b4AQIDBA== + +with + +2 => number of characters of the 1st packet +: => separator +4 => "message" packet type +€ +10 => number of characters of the 2nd packet +: => separator +b => indicates a base64 packet +4 => "message" packet type +AQIDBA== => buffer content encoded in base64 +``` + +## Transports + +An engine.io server must support three transports: + +- websocket +- polling + - jsonp + - xhr + +### Polling + +The polling transport consists of recurring GET requests by the client +to the server to get data, and POST requests with payloads from the +client to the server to send data. + +#### XHR + +The server must support CORS responses. + +#### JSONP + +The server implementation must respond with valid JavaScript. The URL +contains a query string parameter `j` that must be used in the response. +`j` is an integer. + +The format of a JSONP packet. + +``` +`___eio[` `]("` `");` +``` + +To ensure that the payload gets processed correctly, it must be escaped +in such a way that the response is still valid JavaScript. Passing the +encoded payload through a JSON encoder is a good way to escape it. + +Example JSONP frame returned by the server: + +``` +___eio[4]("packet data"); +``` + +##### Posting data + +The client posts data through a hidden iframe. The data gets to the server +in the URI encoded format as follows: + +``` +d= +``` + +In addition to the regular qs escaping, in order to prevent +inconsistencies with `\n` handling by browsers, `\n` gets escaped as `\\n` +prior to being POSTd. + +### WebSocket + +Encoding payloads _should not_ be used for WebSocket, as the protocol +already has a lightweight framing mechanism. + +In order to send a payload of messages, encode packets individually +and `send()` them in succession. + +## Transport upgrading + +A connection always starts with polling (either XHR or JSONP). WebSocket +gets tested on the side by sending a probe. If the probe is responded +from the server, an upgrade packet is sent. + +To ensure no messages are lost, the upgrade packet will only be sent +once all the buffers of the existing transport are flushed and the +transport is considered _paused_. + +When the server receives the upgrade packet, it must assume this is the +new transport channel and send all existing buffers (if any) to it. + +The probe sent by the client is a `ping` packet with `probe` sent as data. +The probe sent by the server is a `pong` packet with `probe` sent as data. + +Moving forward, upgrades other than just `polling -> x` are being considered. + +## Timeouts + +The client must use the `pingTimeout` and the `pingInterval` sent as part +of the handshake (with the `open` packet) to determine whether the server +is unresponsive. + +The client sends a `ping` packet. If no packet type is received within +`pingTimeout`, the client considers the socket disconnected. If a `pong` +packet is actually received, the client will wait `pingInterval` before +sending a `ping` packet again. + +Since the two values are shared between the server and the client, the server +will also be able to detect whether the client becomes unresponsive when it +does not receive any data within `pingTimeout + pingInterval`. + +## Difference between v2 and v3 + +- add support for binary data + +v2 is included in Socket.IO v0.9, while v3 is included in Socket.IO v1/v2. + +## Test suite + +The test suite in the `test-suite/` directory lets you check the compliance of a server implementation. + +Usage: + +- in Node.js: `npm ci && npm test` +- in a browser: simply open the `index.html` file in your browser + +For reference, here is expected configuration for the JavaScript server to pass all tests: + +```js +import { listen } from "engine.io"; + +const server = listen(3000, { + pingInterval: 300, + pingTimeout: 200, + allowEIO3: true, + maxPayload: 1e6, + cors: { + origin: "*" + } +}); + +server.on("connection", socket => { + socket.on("data", (...args) => { + socket.send(...args); + }); +}); +```