607 lines
21 KiB
Markdown
607 lines
21 KiB
Markdown
# session
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> Manage browser sessions, cookies, cache, proxy settings, etc.
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Process: [Main](../glossary.md#main-process)
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The `session` module can be used to create new `Session` objects.
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You can also access the `session` of existing pages by using the `session`
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property of [`WebContents`](web-contents.md), or from the `session` module.
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```javascript
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const { BrowserWindow } = require('electron')
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let win = new BrowserWindow({ width: 800, height: 600 })
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win.loadURL('http://github.com')
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const ses = win.webContents.session
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console.log(ses.getUserAgent())
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```
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## Methods
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The `session` module has the following methods:
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### `session.fromPartition(partition[, options])`
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* `partition` String
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* `options` Object (optional)
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* `cache` Boolean - Whether to enable cache.
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Returns `Session` - A session instance from `partition` string. When there is an existing
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`Session` with the same `partition`, it will be returned; otherwise a new
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`Session` instance will be created with `options`.
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If `partition` starts with `persist:`, the page will use a persistent session
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available to all pages in the app with the same `partition`. if there is no
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`persist:` prefix, the page will use an in-memory session. If the `partition` is
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empty then default session of the app will be returned.
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To create a `Session` with `options`, you have to ensure the `Session` with the
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`partition` has never been used before. There is no way to change the `options`
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of an existing `Session` object.
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## Properties
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The `session` module has the following properties:
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### `session.defaultSession`
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A `Session` object, the default session object of the app.
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## Class: Session
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> Get and set properties of a session.
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Process: [Main](../glossary.md#main-process)
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You can create a `Session` object in the `session` module:
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```javascript
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const { session } = require('electron')
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const ses = session.fromPartition('persist:name')
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console.log(ses.getUserAgent())
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```
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### Instance Events
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The following events are available on instances of `Session`:
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#### Event: 'will-download'
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Returns:
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* `event` Event
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* `item` [DownloadItem](download-item.md)
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* `webContents` [WebContents](web-contents.md)
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Emitted when Electron is about to download `item` in `webContents`.
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Calling `event.preventDefault()` will cancel the download and `item` will not be
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available from next tick of the process.
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```javascript
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const { session } = require('electron')
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session.defaultSession.on('will-download', (event, item, webContents) => {
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event.preventDefault()
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require('request')(item.getURL(), (data) => {
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require('fs').writeFileSync('/somewhere', data)
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})
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})
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```
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#### Event: 'preconnect'
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Returns:
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* `event` Event
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* `preconnectUrl` String - The URL being requested for preconnection by the
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renderer.
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* `allowCredentials` Boolean - True if the renderer is requesting that the
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connection include credentials (see the
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[spec](https://w3c.github.io/resource-hints/#preconnect) for more details.)
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Emitted when a render process requests preconnection to a URL, generally due to
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a [resource hint](https://w3c.github.io/resource-hints/).
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### Instance Methods
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The following methods are available on instances of `Session`:
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#### `ses.getCacheSize()`
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Returns `Promise<Integer>` - the session's current cache size, in bytes.
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#### `ses.clearCache()`
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Returns `Promise<void>` - resolves when the cache clear operation is complete.
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Clears the session’s HTTP cache.
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#### `ses.clearStorageData([options])`
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* `options` Object (optional)
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* `origin` String (optional) - Should follow `window.location.origin`’s representation
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`scheme://host:port`.
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* `storages` String[] (optional) - The types of storages to clear, can contain:
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`appcache`, `cookies`, `filesystem`, `indexdb`, `localstorage`,
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`shadercache`, `websql`, `serviceworkers`, `cachestorage`. If not
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specified, clear all storage types.
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* `quotas` String[] (optional) - The types of quotas to clear, can contain:
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`temporary`, `persistent`, `syncable`. If not specified, clear all quotas.
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Returns `Promise<void>` - resolves when the storage data has been cleared.
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#### `ses.flushStorageData()`
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Writes any unwritten DOMStorage data to disk.
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#### `ses.setProxy(config)`
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* `config` Object
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* `pacScript` String (optional) - The URL associated with the PAC file.
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* `proxyRules` String (optional) - Rules indicating which proxies to use.
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* `proxyBypassRules` String (optional) - Rules indicating which URLs should
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bypass the proxy settings.
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Returns `Promise<void>` - Resolves when the proxy setting process is complete.
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Sets the proxy settings.
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When `pacScript` and `proxyRules` are provided together, the `proxyRules`
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option is ignored and `pacScript` configuration is applied.
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The `proxyRules` has to follow the rules below:
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```sh
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proxyRules = schemeProxies[";"<schemeProxies>]
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schemeProxies = [<urlScheme>"="]<proxyURIList>
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urlScheme = "http" | "https" | "ftp" | "socks"
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proxyURIList = <proxyURL>[","<proxyURIList>]
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proxyURL = [<proxyScheme>"://"]<proxyHost>[":"<proxyPort>]
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```
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For example:
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* `http=foopy:80;ftp=foopy2` - Use HTTP proxy `foopy:80` for `http://` URLs, and
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HTTP proxy `foopy2:80` for `ftp://` URLs.
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* `foopy:80` - Use HTTP proxy `foopy:80` for all URLs.
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* `foopy:80,bar,direct://` - Use HTTP proxy `foopy:80` for all URLs, failing
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over to `bar` if `foopy:80` is unavailable, and after that using no proxy.
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* `socks4://foopy` - Use SOCKS v4 proxy `foopy:1080` for all URLs.
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* `http=foopy,socks5://bar.com` - Use HTTP proxy `foopy` for http URLs, and fail
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over to the SOCKS5 proxy `bar.com` if `foopy` is unavailable.
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* `http=foopy,direct://` - Use HTTP proxy `foopy` for http URLs, and use no
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proxy if `foopy` is unavailable.
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* `http=foopy;socks=foopy2` - Use HTTP proxy `foopy` for http URLs, and use
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`socks4://foopy2` for all other URLs.
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The `proxyBypassRules` is a comma separated list of rules described below:
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* `[ URL_SCHEME "://" ] HOSTNAME_PATTERN [ ":" <port> ]`
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Match all hostnames that match the pattern HOSTNAME_PATTERN.
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Examples:
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"foobar.com", "*foobar.com", "*.foobar.com", "*foobar.com:99",
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"https://x.*.y.com:99"
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* `"." HOSTNAME_SUFFIX_PATTERN [ ":" PORT ]`
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Match a particular domain suffix.
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Examples:
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".google.com", ".com", "http://.google.com"
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* `[ SCHEME "://" ] IP_LITERAL [ ":" PORT ]`
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Match URLs which are IP address literals.
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Examples:
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"127.0.1", "[0:0::1]", "[::1]", "http://[::1]:99"
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* `IP_LITERAL "/" PREFIX_LENGTH_IN_BITS`
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Match any URL that is to an IP literal that falls between the
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given range. IP range is specified using CIDR notation.
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Examples:
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"192.168.1.1/16", "fefe:13::abc/33".
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* `<local>`
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Match local addresses. The meaning of `<local>` is whether the
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host matches one of: "127.0.0.1", "::1", "localhost".
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#### `ses.resolveProxy(url)`
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* `url` URL
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Returns `Promise<String>` - Resolves with the proxy information for `url`.
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#### `ses.setDownloadPath(path)`
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* `path` String - The download location.
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Sets download saving directory. By default, the download directory will be the
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`Downloads` under the respective app folder.
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#### `ses.enableNetworkEmulation(options)`
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* `options` Object
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* `offline` Boolean (optional) - Whether to emulate network outage. Defaults
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to false.
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* `latency` Double (optional) - RTT in ms. Defaults to 0 which will disable
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latency throttling.
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* `downloadThroughput` Double (optional) - Download rate in Bps. Defaults to 0
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which will disable download throttling.
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* `uploadThroughput` Double (optional) - Upload rate in Bps. Defaults to 0
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which will disable upload throttling.
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Emulates network with the given configuration for the `session`.
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```javascript
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// To emulate a GPRS connection with 50kbps throughput and 500 ms latency.
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window.webContents.session.enableNetworkEmulation({
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latency: 500,
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downloadThroughput: 6400,
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uploadThroughput: 6400
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})
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// To emulate a network outage.
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window.webContents.session.enableNetworkEmulation({ offline: true })
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```
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#### `ses.preconnect(options)`
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* `options` Object
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* `url` String - URL for preconnect. Only the origin is relevant for opening the socket.
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* `numSockets` Number (optional) - number of sockets to preconnect. Must be between 1 and 6. Defaults to 1.
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Preconnects the given number of sockets to an origin.
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#### `ses.disableNetworkEmulation()`
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Disables any network emulation already active for the `session`. Resets to
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the original network configuration.
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#### `ses.setCertificateVerifyProc(proc)`
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* `proc` Function | null
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* `request` Object
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* `hostname` String
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* `certificate` [Certificate](structures/certificate.md)
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* `validatedCertificate` [Certificate](structures/certificate.md)
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* `verificationResult` String - Verification result from chromium.
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* `errorCode` Integer - Error code.
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* `callback` Function
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* `verificationResult` Integer - Value can be one of certificate error codes
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from [here](https://code.google.com/p/chromium/codesearch#chromium/src/net/base/net_error_list.h).
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Apart from the certificate error codes, the following special codes can be used.
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* `0` - Indicates success and disables Certificate Transparency verification.
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* `-2` - Indicates failure.
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* `-3` - Uses the verification result from chromium.
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Sets the certificate verify proc for `session`, the `proc` will be called with
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`proc(request, callback)` whenever a server certificate
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verification is requested. Calling `callback(0)` accepts the certificate,
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calling `callback(-2)` rejects it.
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Calling `setCertificateVerifyProc(null)` will revert back to default certificate
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verify proc.
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```javascript
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const { BrowserWindow } = require('electron')
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let win = new BrowserWindow()
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win.webContents.session.setCertificateVerifyProc((request, callback) => {
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const { hostname } = request
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if (hostname === 'github.com') {
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callback(0)
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} else {
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callback(-2)
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}
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})
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```
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#### `ses.setPermissionRequestHandler(handler)`
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* `handler` Function | null
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* `webContents` [WebContents](web-contents.md) - WebContents requesting the permission. Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin.
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* `permission` String - Enum of 'media', 'geolocation', 'notifications', 'midiSysex',
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'pointerLock', 'fullscreen', 'openExternal'.
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* `callback` Function
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* `permissionGranted` Boolean - Allow or deny the permission.
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* `details` Object - Some properties are only available on certain permission types.
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* `externalURL` String (optional) - The url of the `openExternal` request.
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* `mediaTypes` String[] (optional) - The types of media access being requested, elements can be `video`
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or `audio`
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* `requestingUrl` String - The last URL the requesting frame loaded
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* `isMainFrame` Boolean - Whether the frame making the request is the main frame
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Sets the handler which can be used to respond to permission requests for the `session`.
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Calling `callback(true)` will allow the permission and `callback(false)` will reject it.
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To clear the handler, call `setPermissionRequestHandler(null)`.
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```javascript
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const { session } = require('electron')
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session.fromPartition('some-partition').setPermissionRequestHandler((webContents, permission, callback) => {
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if (webContents.getURL() === 'some-host' && permission === 'notifications') {
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return callback(false) // denied.
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}
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callback(true)
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})
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```
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#### `ses.setPermissionCheckHandler(handler)`
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* `handler` Function<Boolean> | null
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* `webContents` [WebContents](web-contents.md) - WebContents checking the permission. Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin.
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* `permission` String - Enum of 'media'.
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* `requestingOrigin` String - The origin URL of the permission check
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* `details` Object - Some properties are only available on certain permission types.
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* `securityOrigin` String - The security orign of the `media` check.
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* `mediaType` String - The type of media access being requested, can be `video`,
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`audio` or `unknown`
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* `requestingUrl` String - The last URL the requesting frame loaded
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* `isMainFrame` Boolean - Whether the frame making the request is the main frame
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Sets the handler which can be used to respond to permission checks for the `session`.
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Returning `true` will allow the permission and `false` will reject it.
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To clear the handler, call `setPermissionCheckHandler(null)`.
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```javascript
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const { session } = require('electron')
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session.fromPartition('some-partition').setPermissionCheckHandler((webContents, permission) => {
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if (webContents.getURL() === 'some-host' && permission === 'notifications') {
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return false // denied
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}
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return true
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})
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```
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#### `ses.clearHostResolverCache()`
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Returns `Promise<void>` - Resolves when the operation is complete.
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Clears the host resolver cache.
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#### `ses.allowNTLMCredentialsForDomains(domains)`
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* `domains` String - A comma-separated list of servers for which
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integrated authentication is enabled.
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Dynamically sets whether to always send credentials for HTTP NTLM or Negotiate
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authentication.
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```javascript
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const { session } = require('electron')
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// consider any url ending with `example.com`, `foobar.com`, `baz`
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// for integrated authentication.
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session.defaultSession.allowNTLMCredentialsForDomains('*example.com, *foobar.com, *baz')
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// consider all urls for integrated authentication.
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session.defaultSession.allowNTLMCredentialsForDomains('*')
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```
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#### `ses.setUserAgent(userAgent[, acceptLanguages])`
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* `userAgent` String
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* `acceptLanguages` String (optional)
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Overrides the `userAgent` and `acceptLanguages` for this session.
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The `acceptLanguages` must a comma separated ordered list of language codes, for
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example `"en-US,fr,de,ko,zh-CN,ja"`.
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This doesn't affect existing `WebContents`, and each `WebContents` can use
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`webContents.setUserAgent` to override the session-wide user agent.
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#### `ses.getUserAgent()`
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Returns `String` - The user agent for this session.
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#### `ses.getBlobData(identifier)`
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* `identifier` String - Valid UUID.
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Returns `Promise<Buffer>` - resolves with blob data.
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#### `ses.downloadURL(url)`
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* `url` String
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Initiates a download of the resource at `url`.
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The API will generate a [DownloadItem](download-item.md) that can be accessed
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with the [will-download](#event-will-download) event.
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**Note:** This does not perform any security checks that relate to a page's origin,
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unlike [`webContents.downloadURL`](web-contents.md#contentsdownloadurlurl).
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#### `ses.createInterruptedDownload(options)`
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* `options` Object
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* `path` String - Absolute path of the download.
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* `urlChain` String[] - Complete URL chain for the download.
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* `mimeType` String (optional)
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* `offset` Integer - Start range for the download.
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* `length` Integer - Total length of the download.
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* `lastModified` String (optional) - Last-Modified header value.
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* `eTag` String (optional) - ETag header value.
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* `startTime` Double (optional) - Time when download was started in
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number of seconds since UNIX epoch.
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Allows resuming `cancelled` or `interrupted` downloads from previous `Session`.
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The API will generate a [DownloadItem](download-item.md) that can be accessed with the [will-download](#event-will-download)
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event. The [DownloadItem](download-item.md) will not have any `WebContents` associated with it and
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the initial state will be `interrupted`. The download will start only when the
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`resume` API is called on the [DownloadItem](download-item.md).
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#### `ses.clearAuthCache(options)`
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* `options` ([RemovePassword](structures/remove-password.md) | [RemoveClientCertificate](structures/remove-client-certificate.md))
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Returns `Promise<void>` - resolves when the session’s HTTP authentication cache has been cleared.
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#### `ses.setPreloads(preloads)`
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* `preloads` String[] - An array of absolute path to preload scripts
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Adds scripts that will be executed on ALL web contents that are associated with
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this session just before normal `preload` scripts run.
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#### `ses.getPreloads()`
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Returns `String[]` an array of paths to preload scripts that have been
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registered.
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#### `ses.setSpellCheckerLanguages(languages)`
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* `languages` String[] - An array of language codes to enable the spellchecker for.
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The built in spellchecker does not automatically detect what language a user is typing in. In order for the
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spell checker to correctly check their words you must call this API with an array of language codes. You can
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get the list of supported language codes with the `ses.availableSpellCheckerLanguages` property.
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**Note:** On macOS the OS spellchecker is used and will detect your language automatically. This API is a no-op on macOS.
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#### `ses.getSpellCheckerLanguages()`
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Returns `String[]` - An array of language codes the spellchecker is enabled for. If this list is empty the spellchecker
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will fallback to using `en-US`. By default on launch if this setting is an empty list Electron will try to populate this
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setting with the current OS locale. This setting is persisted across restarts.
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**Note:** On macOS the OS spellchecker is used and has it's own list of languages. This API is a no-op on macOS.
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#### `ses.setSpellCheckerDictionaryDownloadURL(url)`
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* `url` String - A base URL for Electron to download hunspell dictionaries from.
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By default Electron will download hunspell dictionaries from the Chromium CDN. If you want to override this
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behavior you can use this API to point the dictionary downloader at your own hosted version of the hunspell
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dictionaries. We publish a `hunspell_dictionaries.zip` file with each release which contains the files you need
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to host here.
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**Note:** On macOS the OS spellchecker is used and therefore we do not download any dictionary files. This API is a no-op on macOS.
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#### `ses.addWordToSpellCheckerDictionary(word)`
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* `word` String - The word you want to add to the dictionary
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|
||
Returns `Boolean` - Whether the word was successfully written to the custom dictionary.
|
||
|
||
**Note:** On macOS and Windows 10 this word will be written to the OS custom dictionary as well
|
||
|
||
#### `ses.loadExtension(path)`
|
||
|
||
* `path` String - Path to a directory containing an unpacked Chrome extension
|
||
|
||
Returns `Promise<Extension>` - resolves when the extension is loaded.
|
||
|
||
This method will raise an exception if the extension could not be loaded. If
|
||
there are warnings when installing the extension (e.g. if the extension
|
||
requests an API that Electron does not support) then they will be logged to the
|
||
console.
|
||
|
||
Note that Electron does not support the full range of Chrome extensions APIs.
|
||
|
||
Note that in previous versions of Electron, extensions that were loaded would
|
||
be remembered for future runs of the application. This is no longer the case:
|
||
`loadExtension` must be called on every boot of your app if you want the
|
||
extension to be loaded.
|
||
|
||
```js
|
||
const { app, session } = require('electron')
|
||
const path = require('path')
|
||
|
||
app.on('ready', async () => {
|
||
await session.defaultSession.loadExtension(path.join(__dirname, 'react-devtools'))
|
||
// Note that in order to use the React DevTools extension, you'll need to
|
||
// download and unzip a copy of the extension.
|
||
})
|
||
```
|
||
|
||
This API does not support loading packed (.crx) extensions.
|
||
|
||
**Note:** This API cannot be called before the `ready` event of the `app` module
|
||
is emitted.
|
||
|
||
#### `ses.removeExtension(extensionId)`
|
||
|
||
* `extensionId` String - ID of extension to remove
|
||
|
||
Unloads an extension.
|
||
|
||
**Note:** This API cannot be called before the `ready` event of the `app` module
|
||
is emitted.
|
||
|
||
#### `ses.getExtension(extensionId)`
|
||
|
||
* `extensionId` String - ID of extension to query
|
||
|
||
Returns `Extension` | `null` - The loaded extension with the given ID.
|
||
|
||
**Note:** This API cannot be called before the `ready` event of the `app` module
|
||
is emitted.
|
||
|
||
#### `ses.getAllExtensions()`
|
||
|
||
Returns `Extension[]` - A list of all loaded extensions.
|
||
|
||
**Note:** This API cannot be called before the `ready` event of the `app` module
|
||
is emitted.
|
||
|
||
### Instance Properties
|
||
|
||
The following properties are available on instances of `Session`:
|
||
|
||
#### `ses.availableSpellCheckerLanguages` _Readonly_
|
||
|
||
A `String[]` array which consists of all the known available spell checker languages. Providing a language
|
||
code to the `setSpellCheckerLanaguages` API that isn't in this array will result in an error.
|
||
|
||
#### `ses.cookies` _Readonly_
|
||
|
||
A [`Cookies`](cookies.md) object for this session.
|
||
|
||
#### `ses.webRequest` _Readonly_
|
||
|
||
A [`WebRequest`](web-request.md) object for this session.
|
||
|
||
#### `ses.protocol` _Readonly_
|
||
|
||
A [`Protocol`](protocol.md) object for this session.
|
||
|
||
```javascript
|
||
const { app, session } = require('electron')
|
||
const path = require('path')
|
||
|
||
app.on('ready', () => {
|
||
const protocol = session.fromPartition('some-partition').protocol
|
||
protocol.registerFileProtocol('atom', (request, callback) => {
|
||
let url = request.url.substr(7)
|
||
callback({ path: path.normalize(`${__dirname}/${url}`) })
|
||
}, (error) => {
|
||
if (error) console.error('Failed to register protocol')
|
||
})
|
||
})
|
||
```
|
||
|
||
#### `ses.netLog` _Readonly_
|
||
|
||
A [`NetLog`](net-log.md) object for this session.
|
||
|
||
```javascript
|
||
const { app, session } = require('electron')
|
||
|
||
app.on('ready', async () => {
|
||
const netLog = session.fromPartition('some-partition').netLog
|
||
netLog.startLogging('/path/to/net-log')
|
||
// After some network events
|
||
const path = await netLog.stopLogging()
|
||
console.log('Net-logs written to', path)
|
||
})
|
||
```
|