70 lines
2.4 KiB
Markdown
70 lines
2.4 KiB
Markdown
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agent-base
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==========
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### Turn a function into an [`http.Agent`][http.Agent] instance
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This module is a thin wrapper around the base `http.Agent` class.
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It provides an abstract class that must define a `connect()` function,
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which is responsible for creating the underlying socket that the HTTP
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client requests will use.
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The `connect()` function may return an arbitrary `Duplex` stream, or
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another `http.Agent` instance to delegate the request to, and may be
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asynchronous (by defining an `async` function).
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Instances of this agent can be used with the `http` and `https`
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modules. To differentiate, the options parameter in the `connect()`
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function includes a `secureEndpoint` property, which can be checked
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to determine what type of socket should be returned.
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#### Some subclasses:
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Here are 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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Example
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-------
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Here's a minimal example that creates a new `net.Socket` or `tls.Socket`
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based on the `secureEndpoint` property. This agent can be used with both
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the `http` and `https` modules.
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```ts
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import * as net from 'net';
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import * as tls from 'tls';
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import * as http from 'http';
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import { Agent } from 'agent-base';
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class MyAgent extends Agent {
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connect(req, opts) {
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// `secureEndpoint` is true when using the "https" module
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if (opts.secureEndpoint) {
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return tls.connect(opts);
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} else {
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return net.connect(opts);
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}
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}
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});
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// Keep alive enabled means that `connect()` will only be
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// invoked when a new connection needs to be created
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const agent = new MyAgent({ keepAlive: true });
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// Pass the `agent` option when creating the HTTP request
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http.get('http://nodejs.org/api/', { agent }, (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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[http-proxy-agent]: ../http-proxy-agent
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[https-proxy-agent]: ../https-proxy-agent
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[pac-proxy-agent]: ../pac-proxy-agent
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[socks-proxy-agent]: ../socks-proxy-agent
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[http.Agent]: https://nodejs.org/api/http.html#http_class_http_agent
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