146 lines
4.9 KiB
Markdown
146 lines
4.9 KiB
Markdown
agent-base
|
|
==========
|
|
### Turn a function into an [`http.Agent`][http.Agent] instance
|
|
[](https://github.com/TooTallNate/node-agent-base/actions?workflow=Node+CI)
|
|
|
|
This module provides an `http.Agent` generator. That is, you pass it an async
|
|
callback function, and it returns a new `http.Agent` instance that will invoke the
|
|
given callback function when sending outbound HTTP requests.
|
|
|
|
#### Some subclasses:
|
|
|
|
Here's some more interesting uses of `agent-base`.
|
|
Send a pull request to list yours!
|
|
|
|
* [`http-proxy-agent`][http-proxy-agent]: An HTTP(s) proxy `http.Agent` implementation for HTTP endpoints
|
|
* [`https-proxy-agent`][https-proxy-agent]: An HTTP(s) proxy `http.Agent` implementation for HTTPS endpoints
|
|
* [`pac-proxy-agent`][pac-proxy-agent]: A PAC file proxy `http.Agent` implementation for HTTP and HTTPS
|
|
* [`socks-proxy-agent`][socks-proxy-agent]: A SOCKS proxy `http.Agent` implementation for HTTP and HTTPS
|
|
|
|
|
|
Installation
|
|
------------
|
|
|
|
Install with `npm`:
|
|
|
|
``` bash
|
|
$ npm install agent-base
|
|
```
|
|
|
|
|
|
Example
|
|
-------
|
|
|
|
Here's a minimal example that creates a new `net.Socket` connection to the server
|
|
for every HTTP request (i.e. the equivalent of `agent: false` option):
|
|
|
|
```js
|
|
var net = require('net');
|
|
var tls = require('tls');
|
|
var url = require('url');
|
|
var http = require('http');
|
|
var agent = require('agent-base');
|
|
|
|
var endpoint = 'http://nodejs.org/api/';
|
|
var parsed = url.parse(endpoint);
|
|
|
|
// This is the important part!
|
|
parsed.agent = agent(function (req, opts) {
|
|
var socket;
|
|
// `secureEndpoint` is true when using the https module
|
|
if (opts.secureEndpoint) {
|
|
socket = tls.connect(opts);
|
|
} else {
|
|
socket = net.connect(opts);
|
|
}
|
|
return socket;
|
|
});
|
|
|
|
// Everything else works just like normal...
|
|
http.get(parsed, function (res) {
|
|
console.log('"response" event!', res.headers);
|
|
res.pipe(process.stdout);
|
|
});
|
|
```
|
|
|
|
Returning a Promise or using an `async` function is also supported:
|
|
|
|
```js
|
|
agent(async function (req, opts) {
|
|
await sleep(1000);
|
|
// etc…
|
|
});
|
|
```
|
|
|
|
Return another `http.Agent` instance to "pass through" the responsibility
|
|
for that HTTP request to that agent:
|
|
|
|
```js
|
|
agent(function (req, opts) {
|
|
return opts.secureEndpoint ? https.globalAgent : http.globalAgent;
|
|
});
|
|
```
|
|
|
|
|
|
API
|
|
---
|
|
|
|
## Agent(Function callback[, Object options]) → [http.Agent][]
|
|
|
|
Creates a base `http.Agent` that will execute the callback function `callback`
|
|
for every HTTP request that it is used as the `agent` for. The callback function
|
|
is responsible for creating a `stream.Duplex` instance of some kind that will be
|
|
used as the underlying socket in the HTTP request.
|
|
|
|
The `options` object accepts the following properties:
|
|
|
|
* `timeout` - Number - Timeout for the `callback()` function in milliseconds. Defaults to Infinity (optional).
|
|
|
|
The callback function should have the following signature:
|
|
|
|
### callback(http.ClientRequest req, Object options, Function cb) → undefined
|
|
|
|
The ClientRequest `req` can be accessed to read request headers and
|
|
and the path, etc. The `options` object contains the options passed
|
|
to the `http.request()`/`https.request()` function call, and is formatted
|
|
to be directly passed to `net.connect()`/`tls.connect()`, or however
|
|
else you want a Socket to be created. Pass the created socket to
|
|
the callback function `cb` once created, and the HTTP request will
|
|
continue to proceed.
|
|
|
|
If the `https` module is used to invoke the HTTP request, then the
|
|
`secureEndpoint` property on `options` _will be set to `true`_.
|
|
|
|
|
|
License
|
|
-------
|
|
|
|
(The MIT License)
|
|
|
|
Copyright (c) 2013 Nathan Rajlich <nathan@tootallnate.net>
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
|
a copy of this software and associated documentation files (the
|
|
'Software'), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to
|
|
permit persons to whom the Software is furnished to do so, subject to
|
|
the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
[http-proxy-agent]: https://github.com/TooTallNate/node-http-proxy-agent
|
|
[https-proxy-agent]: https://github.com/TooTallNate/node-https-proxy-agent
|
|
[pac-proxy-agent]: https://github.com/TooTallNate/node-pac-proxy-agent
|
|
[socks-proxy-agent]: https://github.com/TooTallNate/node-socks-proxy-agent
|
|
[http.Agent]: https://nodejs.org/api/http.html#http_class_http_agent
|