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