http: add default argument for Agent.prototype.getName

PR-URL: https://github.com/nodejs/node/pull/41906
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>

doc/api/http.md

@@ -296,10 +296,14 @@ the agent when `keepAlive` is enabled. Do not modify.
 Sockets in the `freeSockets` list will be automatically destroyed and
 removed from the array on `'timeout'`.
 
-### `agent.getName(options)`
+### `agent.getName([options])`
 
 <!-- YAML
 added: v0.11.4
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/41906
+    description: The `options` parameter is now optional.
 -->
 
 * `options` {Object} A set of options providing information for name generation

lib/_http_agent.js

@@ -217,7 +217,7 @@ Agent.defaultMaxSockets = Infinity;
 Agent.prototype.createConnection = net.createConnection;
 
 // Get the key for a given set of request options
-Agent.prototype.getName = function getName(options) {
+Agent.prototype.getName = function getName(options = {}) {
   let name = options.host || 'localhost';
 
   name += ':';

lib/https.js

@@ -203,7 +203,7 @@ Agent.prototype.createConnection = createConnection;
  *   }} [options]
  * @returns {string}
  */
-Agent.prototype.getName = function getName(options) {
+Agent.prototype.getName = function getName(options = {}) {
   let name = FunctionPrototypeCall(HttpAgent.prototype.getName, this, options);
 
   name += ':';

test/parallel/test-http-agent-getname.js

@@ -18,7 +18,13 @@ assert.strictEqual(
   'localhost:80:192.168.1.1'
 );
 
-// empty
+// empty argument
+assert.strictEqual(
+  agent.getName(),
+  'localhost::'
+);
+
+// empty options
 assert.strictEqual(
   agent.getName({}),
   'localhost::'

test/parallel/test-https-agent-getname.js

@@ -9,6 +9,12 @@ const https = require('https');
 
 const agent = new https.Agent();
 
+// empty argument
+assert.strictEqual(
+  agent.getName(),
+  'localhost::::::::::::::::::::::'
+);
+
 // empty options
 assert.strictEqual(
   agent.getName({}),