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+# Connector
+
+Undici creates the underlying socket via the connector builder.
+Normally, this happens automatically and you don't need to care about this,
+but if you need to perform some additional check over the currently used socket,
+this is the right place.
+
+If you want to create a custom connector, you must import the `buildConnector` utility.
+
+#### Parameter: `buildConnector.BuildOptions`
+
+Every Tls option, see [here](https://nodejs.org/api/tls.html#tls_tls_connect_options_callback).
+Furthermore, the following options can be passed:
+
+* **socketPath** `string | null` (optional) - Default: `null` - An IPC endpoint, either Unix domain socket or Windows named pipe.
+* **maxCachedSessions** `number | null` (optional) - Default: `100` - Maximum number of TLS cached sessions. Use 0 to disable TLS session caching. Default: `100`.
+* **timeout** `number | null` (optional) -  In milliseconds. Default `10e3`.
+* **servername** `string | null` (optional)
+
+Once you call `buildConnector`, it will return a connector function, which takes the following parameters.
+
+#### Parameter: `connector.Options`
+
+* **hostname** `string` (required)
+* **host** `string` (optional)
+* **protocol** `string` (required)
+* **port** `string` (required)
+* **servername** `string` (optional)
+* **localAddress** `string | null` (optional) Local address the socket should connect from.
+* **httpSocket** `Socket` (optional) Establish secure connection on a given socket rather than creating a new socket. It can only be sent on TLS update.
+
+### Basic example
+
+```js
+'use strict'
+
+import { Client, buildConnector } from 'undici'
+
+const connector = buildConnector({ rejectUnauthorized: false })
+const client = new Client('https://localhost:3000', {
+  connect (opts, cb) {
+    connector(opts, (err, socket) => {
+      if (err) {
+        cb(err)
+      } else if (/* assertion */) {
+        socket.destroy()
+        cb(new Error('kaboom'))
+      } else {
+        cb(null, socket)
+      }
+    })
+  }
+})
+```
+
+### Example: validate the CA fingerprint
+
+```js
+'use strict'
+
+import { Client, buildConnector } from 'undici'
+
+const caFingerprint = 'FO:OB:AR'
+const connector = buildConnector({ rejectUnauthorized: false })
+const client = new Client('https://localhost:3000', {
+  connect (opts, cb) {
+    connector(opts, (err, socket) => {
+      if (err) {
+        cb(err)
+      } else if (getIssuerCertificate(socket).fingerprint256 !== caFingerprint) {
+        socket.destroy()
+        cb(new Error('Fingerprint does not match or malformed certificate'))
+      } else {
+        cb(null, socket)
+      }
+    })
+  }
+})
+
+client.request({
+  path: '/',
+  method: 'GET'
+}, (err, data) => {
+  if (err) throw err
+
+  const bufs = []
+  data.body.on('data', (buf) => {
+    bufs.push(buf)
+  })
+  data.body.on('end', () => {
+    console.log(Buffer.concat(bufs).toString('utf8'))
+    client.close()
+  })
+})
+
+function getIssuerCertificate (socket) {
+  let certificate = socket.getPeerCertificate(true)
+  while (certificate && Object.keys(certificate).length > 0) {
+    // invalid certificate
+    if (certificate.issuerCertificate == null) {
+      return null
+    }
+
+    // We have reached the root certificate.
+    // In case of self-signed certificates, `issuerCertificate` may be a circular reference.
+    if (certificate.fingerprint256 === certificate.issuerCertificate.fingerprint256) {
+      break
+    }
+
+    // continue the loop
+    certificate = certificate.issuerCertificate
+  }
+  return certificate
+}
+```