2016-11-10 20:25:26 +00:00
|
|
|
## Class: ClientRequest
|
|
|
|
|
|
|
|
> Make HTTP/HTTPS requests.
|
|
|
|
|
2016-11-23 19:20:56 +00:00
|
|
|
Process: [Main](../glossary.md#main-process)
|
2016-11-10 20:25:26 +00:00
|
|
|
|
|
|
|
`ClientRequest` implements the [Writable Stream](https://nodejs.org/api/stream.html#stream_writable_streams)
|
|
|
|
interface and is therefore an [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter).
|
|
|
|
|
|
|
|
### `new ClientRequest(options)`
|
|
|
|
|
|
|
|
* `options` (Object | String) - If `options` is a String, it is interpreted as
|
|
|
|
the request URL. If it is an object, it is expected to fully specify an HTTP request via the
|
|
|
|
following properties:
|
|
|
|
* `method` String (optional) - The HTTP request method. Defaults to the GET
|
|
|
|
method.
|
|
|
|
* `url` String (optional) - The request URL. Must be provided in the absolute
|
|
|
|
form with the protocol scheme specified as http or https.
|
|
|
|
* `session` Object (optional) - The [`Session`](session.md) instance with
|
|
|
|
which the request is associated.
|
|
|
|
* `partition` String (optional) - The name of the [`partition`](session.md)
|
|
|
|
with which the request is associated. Defaults to the empty string. The
|
|
|
|
`session` option prevails on `partition`. Thus if a `session` is explicitly
|
|
|
|
specified, `partition` is ignored.
|
|
|
|
* `protocol` String (optional) - The protocol scheme in the form 'scheme:'.
|
|
|
|
Currently supported values are 'http:' or 'https:'. Defaults to 'http:'.
|
|
|
|
* `host` String (optional) - The server host provided as a concatenation of
|
|
|
|
the hostname and the port number 'hostname:port'
|
|
|
|
* `hostname` String (optional) - The server host name.
|
|
|
|
* `port` Integer (optional) - The server's listening port number.
|
|
|
|
* `path` String (optional) - The path part of the request URL.
|
2017-03-25 07:07:34 +00:00
|
|
|
* `redirect` String (optional) - The redirect mode for this request. Should be
|
|
|
|
one of `follow`, `error` or `manual`. Defaults to `follow`. When mode is `error`,
|
|
|
|
any redirection will be aborted. When mode is `manual` the redirection will be
|
|
|
|
deferred until [`request.followRedirect`](#requestfollowRedirect) is invoked. Listen for the [`redirect`](#event-redirect) event in
|
|
|
|
this mode to get more details about the redirect request.
|
2016-11-10 20:25:26 +00:00
|
|
|
|
|
|
|
`options` properties such as `protocol`, `host`, `hostname`, `port` and `path`
|
|
|
|
strictly follow the Node.js model as described in the
|
|
|
|
[URL](https://nodejs.org/api/url.html) module.
|
|
|
|
|
|
|
|
For instance, we could have created the same request to 'github.com' as follows:
|
|
|
|
|
|
|
|
```JavaScript
|
|
|
|
const request = net.request({
|
|
|
|
method: 'GET',
|
|
|
|
protocol: 'https:',
|
|
|
|
hostname: 'github.com',
|
|
|
|
port: 443,
|
|
|
|
path: '/'
|
|
|
|
})
|
|
|
|
```
|
|
|
|
|
|
|
|
### Instance Events
|
|
|
|
|
|
|
|
#### Event: 'response'
|
|
|
|
|
|
|
|
Returns:
|
|
|
|
|
|
|
|
* `response` IncomingMessage - An object representing the HTTP response message.
|
|
|
|
|
|
|
|
#### Event: 'login'
|
|
|
|
|
|
|
|
Returns:
|
|
|
|
|
|
|
|
* `authInfo` Object
|
|
|
|
* `isProxy` Boolean
|
|
|
|
* `scheme` String
|
|
|
|
* `host` String
|
|
|
|
* `port` Integer
|
|
|
|
* `realm` String
|
|
|
|
* `callback` Function
|
2017-03-25 01:37:07 +00:00
|
|
|
* `username` String
|
|
|
|
* `password` String
|
2016-11-10 20:25:26 +00:00
|
|
|
|
|
|
|
Emitted when an authenticating proxy is asking for user credentials.
|
|
|
|
|
|
|
|
The `callback` function is expected to be called back with user credentials:
|
|
|
|
|
|
|
|
* `username` String
|
|
|
|
* `password` String
|
|
|
|
|
|
|
|
```JavaScript
|
|
|
|
request.on('login', (authInfo, callback) => {
|
|
|
|
callback('username', 'password')
|
|
|
|
})
|
|
|
|
```
|
|
|
|
Providing empty credentials will cancel the request and report an authentication
|
|
|
|
error on the response object:
|
|
|
|
|
|
|
|
```JavaScript
|
|
|
|
request.on('response', (response) => {
|
|
|
|
console.log(`STATUS: ${response.statusCode}`);
|
|
|
|
response.on('error', (error) => {
|
|
|
|
console.log(`ERROR: ${JSON.stringify(error)}`)
|
|
|
|
})
|
|
|
|
})
|
|
|
|
request.on('login', (authInfo, callback) => {
|
|
|
|
callback()
|
|
|
|
})
|
|
|
|
```
|
|
|
|
|
|
|
|
#### Event: 'finish'
|
|
|
|
|
|
|
|
Emitted just after the last chunk of the `request`'s data has been written into
|
|
|
|
the `request` object.
|
|
|
|
|
|
|
|
#### Event: 'abort'
|
|
|
|
|
|
|
|
Emitted when the `request` is aborted. The `abort` event will not be fired if
|
|
|
|
the `request` is already closed.
|
|
|
|
|
|
|
|
#### Event: 'error'
|
|
|
|
|
|
|
|
Returns:
|
|
|
|
|
|
|
|
* `error` Error - an error object providing some information about the failure.
|
|
|
|
|
|
|
|
Emitted when the `net` module fails to issue a network request. Typically when
|
|
|
|
the `request` object emits an `error` event, a `close` event will subsequently
|
|
|
|
follow and no response object will be provided.
|
|
|
|
|
|
|
|
#### Event: 'close'
|
|
|
|
|
|
|
|
Emitted as the last event in the HTTP request-response transaction. The `close`
|
|
|
|
event indicates that no more events will be emitted on either the `request` or
|
|
|
|
`response` objects.
|
|
|
|
|
2017-03-25 07:07:34 +00:00
|
|
|
|
|
|
|
#### Event: 'redirect'
|
|
|
|
|
|
|
|
Returns:
|
|
|
|
|
|
|
|
* `statusCode` Integer
|
|
|
|
* `method` String
|
|
|
|
* `redirectUrl` String
|
|
|
|
* `responseHeaders` Object
|
|
|
|
|
|
|
|
Emitted when there is redirection and the mode is `manual`. Calling
|
|
|
|
[`request.followRedirect`](#requestfollowRedirect) will continue with the redirection.
|
|
|
|
|
2016-11-10 20:25:26 +00:00
|
|
|
### Instance Properties
|
|
|
|
|
|
|
|
#### `request.chunkedEncoding`
|
|
|
|
|
|
|
|
A Boolean specifying whether the request will use HTTP chunked transfer encoding
|
|
|
|
or not. Defaults to false. The property is readable and writable, however it can
|
|
|
|
be set only before the first write operation as the HTTP headers are not yet put
|
|
|
|
on the wire. Trying to set the `chunkedEncoding` property after the first write
|
|
|
|
will throw an error.
|
|
|
|
|
|
|
|
Using chunked encoding is strongly recommended if you need to send a large
|
|
|
|
request body as data will be streamed in small chunks instead of being
|
|
|
|
internally buffered inside Electron process memory.
|
|
|
|
|
|
|
|
### Instance Methods
|
|
|
|
|
|
|
|
#### `request.setHeader(name, value)`
|
|
|
|
|
|
|
|
* `name` String - An extra HTTP header name.
|
|
|
|
* `value` String - An extra HTTP header value.
|
|
|
|
|
|
|
|
Adds an extra HTTP header. The header name will issued as it is without
|
|
|
|
lowercasing. It can be called only before first write. Calling this method after
|
|
|
|
the first write will throw an error.
|
|
|
|
|
|
|
|
#### `request.getHeader(name)`
|
|
|
|
|
|
|
|
* `name` String - Specify an extra header name.
|
|
|
|
|
|
|
|
Returns String - The value of a previously set extra header name.
|
|
|
|
|
|
|
|
#### `request.removeHeader(name)`
|
|
|
|
|
|
|
|
* `name` String - Specify an extra header name.
|
|
|
|
|
|
|
|
Removes a previously set extra header name. This method can be called only
|
|
|
|
before first write. Trying to call it after the first write will throw an error.
|
|
|
|
|
|
|
|
#### `request.write(chunk[, encoding][, callback])`
|
|
|
|
|
|
|
|
* `chunk` (String | Buffer) - A chunk of the request body's data. If it is a
|
|
|
|
string, it is converted into a Buffer using the specified encoding.
|
|
|
|
* `encoding` String (optional) - Used to convert string chunks into Buffer
|
|
|
|
objects. Defaults to 'utf-8'.
|
|
|
|
* `callback` Function (optional) - Called after the write operation ends.
|
|
|
|
|
|
|
|
`callback` is essentially a dummy function introduced in the purpose of keeping
|
|
|
|
similarity with the Node.js API. It is called asynchronously in the next tick
|
|
|
|
after `chunk` content have been delivered to the Chromium networking layer.
|
|
|
|
Contrary to the Node.js implementation, it is not guaranteed that `chunk`
|
|
|
|
content have been flushed on the wire before `callback` is called.
|
|
|
|
|
|
|
|
Adds a chunk of data to the request body. The first write operation may cause
|
|
|
|
the request headers to be issued on the wire. After the first write operation,
|
|
|
|
it is not allowed to add or remove a custom header.
|
|
|
|
|
|
|
|
#### `request.end([chunk][, encoding][, callback])`
|
|
|
|
|
|
|
|
* `chunk` (String | Buffer) (optional)
|
|
|
|
* `encoding` String (optional)
|
|
|
|
* `callback` Function (optional)
|
|
|
|
|
|
|
|
Sends the last chunk of the request data. Subsequent write or end operations
|
|
|
|
will not be allowed. The `finish` event is emitted just after the end operation.
|
|
|
|
|
|
|
|
#### `request.abort()`
|
|
|
|
|
|
|
|
Cancels an ongoing HTTP transaction. If the request has already emitted the
|
|
|
|
`close` event, the abort operation will have no effect. Otherwise an ongoing
|
|
|
|
event will emit `abort` and `close` events. Additionally, if there is an ongoing
|
|
|
|
response object,it will emit the `aborted` event.
|
2017-03-25 07:07:34 +00:00
|
|
|
|
|
|
|
#### `request.followRedirect()`
|
|
|
|
|
|
|
|
Continues any deferred redirection request when the redirection mode is `manual`.
|