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authorArjun Roychowdhury <pliablepixels@gmail.com>2015-10-31 08:21:38 -0400
committerArjun Roychowdhury <pliablepixels@gmail.com>2015-10-31 08:21:38 -0400
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-# WebSocket for Android [![GitHub version](https://badge.fury.io/gh/knowledgecode%2FWebSocket-for-Android.svg)](http://badge.fury.io/gh/knowledgecode%2FWebSocket-for-Android)
-WebSocket for Android is a Cordova plugin that makes WebSocket (RFC 6455) available on Android.
-This is based on [Jetty 8](https://github.com/eclipse/jetty.project/tree/jetty-8) under the terms of the Apache License v2.0.
-
-## Requirements
- - Android 2.3 or later (recommended 4.1 or later)
- - `cordova-android@3.0.0` or later or compatible framework
- - `cordova-plugin-whitelist` or `cordova-plugin-legacy-whitelist` if using `cordova-android@4.0.0` and later
-
-The plugin for Cordova 2.x can be found [here](https://github.com/knowledgecode/WebSocket-for-Android/tree/2.x).
-
-## Supported Features
-| version | WS protocol | WSS protocol | text message | binary message |
-|:--------------:|:-----------:|:------------:|:------------:|:--------------:|
-| 2.3.3 (API 10) | ✓ | ✓ | ✓ | |
-| 4.0 (API 14) | ✓ | ✓ | ✓ | ✓ |
-| 4.0.3 (API 15) | ✓ | ✓ | ✓ | ✓ |
-| 4.1.2 (API 16) | ✓ | ✓ | ✓ | ✓ |
-| 4.2.2 (API 17) | ✓ | ✓ | ✓ | ✓ |
-| 4.3.1 (API 18) | ✓ | ✓ | ✓ | ✓ |
-| 4.4.2 (API 19) | - | - | - | - |
-| 5.0.1 (API 21) | - | - | - | - |
-| 5.1.1 (API 22) | - | - | - | - |
-
-#### Notes
- - WSS protocol is only supported TLS. SSLv3 is not.
- - Android 3.x (Honeycomb) are not supported (might work but is not tested).
- - A new WebView based on Chromium supports WebSocket. Specifically Android 4.4 (KitKat) and later support them, so this plugin is **NOT** used on them by default.
- - In `cordova-android@4.0.0` and later, this plugin can be used together with [Crosswalk](https://crosswalk-project.org/). In this case also it is not used by default because Crosswalk supports WebSocket.
- - To support Android 5.x (Lollipop), would be better to build with `cordova-android@3.7.1` or later.
-
-## Installation
-Use Cordova Command-Line Interface (CLI). At first, check Cordova version:
-```sh
-$ cordova --version
-```
-If using 5.0.0 or later, you can install it via npm:
-```sh
-$ cordova plugin add cordova-plugin-websocket
-```
-If using other old versions, you can install it via GitHub:
-```sh
-$ cordova plugin add https://github.com/knowledgecode/WebSocket-for-Android.git
-```
-
-#### Caveats
-Cordova core plugins have been moved to npm from Cordova plugins registry (CPR). This plugin has been moved as well. It will be **no longer updated** in CPR. Not recommended even if you can still install it from there:
-```sh
-$ cordova plugin add com.knowledgecode.cordova.websocket
-```
-
-#### Setting a Content-Security-Policy (CSP)
-`cordova-android@4.0.0` supports SCP. In order to permit WebSocket access using `cordova-plugin-whitelist`, append `connect-src` directive in `index.html`:
-```html
-connect-src ws://example.com wss://example.com
-```
-For example:
-```html
-<head>
- <meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *; connect-src ws://example.com wss://example.com">
-```
-
-## Upgrading from previous versions
-Check the plugin id:
-```sh
-$ cordova plugin
-```
-Remove and reinstall:
-```sh
-$ cordova plugin rm <PLUGIN ID>
-$ cordova plugin add cordova-plugin-websocket
-```
-Also will need to install `cordova-plugin-whitelist` or `cordova-plugin-legacy-whitelist` if using `cordova-android@4.0.0` and later.
-
-#### Caveats
-When install this plugin, it adds `INTERNET` permission to `platforms/android/AndroidManifest.xml`. If remove this plugin, the permission is also removed at the same time even if it is required for other plugins.
-
-## Usage
-### *WebSocket(url[, protocols])*
-The WebSocket(url, protocols) constructor takes one or two arguments. The first argument, url, specifies the URL to which to connect. The second, protocols, is either a string or an array of strings.
-A simple code is as follows:
-```javascript
-document.addEventListener('deviceready', function () {
- var ws = new WebSocket('ws://echo.websocket.org');
-
- ws.onopen = function () {
- console.log('open');
- this.send('hello'); // transmit "hello" after connecting
- };
-
- ws.onmessage = function (event) {
- console.log(event.data); // will be "hello"
- this.close();
- };
-
- ws.onerror = function () {
- console.log('error occurred!');
- };
-
- ws.onclose = function (event) {
- console.log('close code=' + event.code);
- };
-}, false);
-```
-#### Options
-This plugin has the following options. All these parameters are optional. Of course these don't affect built-in WebSocket.
-
-| key | type | default value | supported version |
-|:---------------------|:--------|:--------------------|:-------------------------|
-| origin | String | file:// (usually) | v0.3.0 ~ |
-| maxConnectTime | Number | 75000 | v0.4.0 ~ |
-| maxTextMessageSize | Number | -1 | v0.4.0 ~ (except v0.8.x) |
-| maxBinaryMessageSize | Number | -1 | v0.4.0 ~ (except v0.8.x) |
-| override | Boolean | false | v0.8.0 ~ |
-| agent | String | (depends on device) | v0.9.0 ~ |
-| perMessageDeflate | Boolean | true | v0.10.0 ~ |
-
-`origin` is a value to set the request header field. Default value is usually `file://`. This is the same value as when using built-in WebSocket.
-
-`maxConnectTime` is time to wait for connection. A unit is millisecond.
-
-`maxTextMessageSize` and `maxBinaryMessageSize` are receivable maximum size from the server. Default value is -1 (unlimited. depends on heap size of devices). A unit is byte.
-
-`override` is a flag to force WebView to use this plugin even if it supports WebSocket. However in most cases it will be slower than built-in WebSocket.
-
-`agent` is user-agent to set the request header field. Default value depends on devices. This is the same value as when using built-in WebSocket.
-
-`perMessageDeflate` is a flag whether to use permessage-deflate extension or not. Default value is true (but as of v0.10 was false). Sends data with compression if the server also supports permessage-deflate. However if mainly sending compressed binary like JPEG images, recommended to set to false.
-
-If change these parameters, need to do before creating a instance:
-```javascript
-WebSocket.pluginOptions = {
- origin: 'http://example.com',
- maxConnectTime: 5000,
- override: true
-};
-
-var ws = new WebSocket('ws://echo.websocket.org');
-```
-### *send(data)*
-Transmits data to the server over the WebSocket connection. The data takes a string, a blob, or an arraybuffer.
-
-#### Notes
-An upper limit of the message size depends on heap size of devices. It would be better to consider a way to split the message if it is quite large.
-### *close([code[, reason]])*
-Closes the WebSocket connection or connection attempt, if any.
-
-## Change Log
-See [CHANGELOG.md](https://github.com/knowledgecode/WebSocket-for-Android/blob/master/CHANGELOG.md).
-
-## License
-This plugin is available under the terms of the Apache License Version 2.0.