diff --git a/doc/api/http.md b/doc/api/http.md
index 0c9117202498a8..88f2378421998e 100644
--- a/doc/api/http.md
+++ b/doc/api/http.md
@@ -1449,20 +1449,11 @@ type other than {net.Socket}.
 
 <!-- YAML
 added: v0.1.90
-changes:
-  - version:
-      - REPLACEME
-    pr-url: https://github.com/nodejs/node/pull/43522
-    description: The method closes idle connections before returning.
-
 -->
 
 * `callback` {Function}
 
-Stops the server from accepting new connections and closes all connections
-connected to this server which are not sending a request or waiting for
-a response.
-See [`net.Server.close()`][].
+Stops the server from accepting new connections. See [`net.Server.close()`][].
 
 ### `server.closeAllConnections()`
 
@@ -3223,11 +3214,6 @@ server.listen(8000);
 
 <!-- YAML
 added: v0.5.9
-changes:
-  - version:
-      - REPLACEME
-    pr-url: https://github.com/nodejs/node/pull/43522
-    description: The agent now uses HTTP Keep-Alive by default.
 -->
 
 * {http.Agent}
diff --git a/doc/api/https.md b/doc/api/https.md
index ce8a47fedded29..bc5c8a246dcdf4 100644
--- a/doc/api/https.md
+++ b/doc/api/https.md
@@ -309,11 +309,6 @@ https.get('https://encrypted.google.com/', (res) => {
 
 <!-- YAML
 added: v0.5.9
-changes:
-  - version:
-      - REPLACEME
-    pr-url: https://github.com/nodejs/node/pull/43522
-    description: The agent now uses HTTP Keep-Alive by default.
 -->
 
 Global instance of [`https.Agent`][] for all HTTPS client requests.
diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index 14096361760657..791a43c8d5d029 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -31,12 +31,10 @@ const {
   ArrayPrototypeSplice,
   FunctionPrototypeCall,
   NumberIsNaN,
-  NumberParseInt,
   ObjectCreate,
   ObjectKeys,
   ObjectSetPrototypeOf,
   ObjectValues,
-  RegExpPrototypeExec,
   StringPrototypeIndexOf,
   StringPrototypeSplit,
   StringPrototypeStartsWith,
@@ -494,24 +492,7 @@ Agent.prototype.keepSocketAlive = function keepSocketAlive(socket) {
   socket.setKeepAlive(true, this.keepAliveMsecs);
   socket.unref();
 
-  let agentTimeout = this.options.timeout || 0;
-
-  if (socket._httpMessage?.res) {
-    const keepAliveHint = socket._httpMessage.res.headers['keep-alive'];
-
-    if (keepAliveHint) {
-      const hint = RegExpPrototypeExec(/^timeout=(\d+)/, keepAliveHint)?.[1];
-
-      if (hint) {
-        const serverHintTimeout = NumberParseInt(hint) * 1000;
-
-        if (serverHintTimeout < agentTimeout) {
-          agentTimeout = serverHintTimeout;
-        }
-      }
-    }
-  }
-
+  const agentTimeout = this.options.timeout || 0;
   if (socket.timeout !== agentTimeout) {
     socket.setTimeout(agentTimeout);
   }
@@ -561,5 +542,5 @@ function asyncResetHandle(socket) {
 
 module.exports = {
   Agent,
-  globalAgent: new Agent({ keepAlive: true, scheduling: 'lifo', timeout: 5000 })
+  globalAgent: new Agent()
 };
diff --git a/lib/_http_server.js b/lib/_http_server.js
index e908b1b1b3d5cf..c312267aa51e2e 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -478,7 +478,6 @@ ObjectSetPrototypeOf(Server.prototype, net.Server.prototype);
 ObjectSetPrototypeOf(Server, net.Server);
 
 Server.prototype.close = function() {
-  this.closeIdleConnections();
   clearInterval(this[kConnectionsCheckingInterval]);
   ReflectApply(net.Server.prototype.close, this, arguments);
 };
diff --git a/lib/https.js b/lib/https.js
index 0ecd13b1dd36ed..7ae8ab2987538b 100644
--- a/lib/https.js
+++ b/lib/https.js
@@ -331,7 +331,7 @@ Agent.prototype._evictSession = function _evictSession(key) {
   delete this._sessionCache.map[key];
 };
 
-const globalAgent = new Agent({ keepAlive: true, scheduling: 'lifo', timeout: 5000 });
+const globalAgent = new Agent();
 
 /**
  * Makes a request to a secure web server.
diff --git a/test/async-hooks/test-graph.http.js b/test/async-hooks/test-graph.http.js
index 62d27fe1b54431..0a003427f9e133 100644
--- a/test/async-hooks/test-graph.http.js
+++ b/test/async-hooks/test-graph.http.js
@@ -12,7 +12,6 @@ const hooks = initHooks();
 hooks.enable();
 
 const server = http.createServer(common.mustCall((req, res) => {
-  res.writeHead(200, { 'Connection': 'close' });
   res.end();
   server.close(common.mustCall());
 }));
diff --git a/test/parallel/test-http-agent-no-wait.js b/test/parallel/test-http-agent-no-wait.js
deleted file mode 100644
index 62a381e85ce07c..00000000000000
--- a/test/parallel/test-http-agent-no-wait.js
+++ /dev/null
@@ -1,24 +0,0 @@
-'use strict';
-
-const common = require('../common');
-const assert = require('assert');
-const http = require('http');
-
-const server = http.createServer(function(req, res) {
-  res.writeHead(200);
-  res.end();
-});
-
-server.listen(0, common.mustCall(() => {
-  const req = http.get({ port: server.address().port }, (res) => {
-    assert.strictEqual(res.statusCode, 200);
-
-    res.resume();
-    server.close();
-  });
-
-  req.end();
-}));
-
-// This timer should never go off as the server will close the socket
-setTimeout(common.mustNotCall(), 1000).unref();
diff --git a/test/parallel/test-http-client-agent.js b/test/parallel/test-http-client-agent.js
index 0c348acc4bd68a..77616edd99d2fb 100644
--- a/test/parallel/test-http-client-agent.js
+++ b/test/parallel/test-http-client-agent.js
@@ -27,7 +27,6 @@ const Countdown = require('../common/countdown');
 
 let name;
 const max = 3;
-const agent = new http.Agent();
 
 const server = http.Server(common.mustCall((req, res) => {
   if (req.url === '/0') {
@@ -41,28 +40,27 @@ const server = http.Server(common.mustCall((req, res) => {
   }
 }, max));
 server.listen(0, common.mustCall(() => {
-  name = agent.getName({ port: server.address().port });
+  name = http.globalAgent.getName({ port: server.address().port });
   for (let i = 0; i < max; ++i)
     request(i);
 }));
 
 const countdown = new Countdown(max, () => {
-  assert(!(name in agent.sockets));
-  assert(!(name in agent.requests));
+  assert(!(name in http.globalAgent.sockets));
+  assert(!(name in http.globalAgent.requests));
   server.close();
 });
 
 function request(i) {
   const req = http.get({
     port: server.address().port,
-    path: `/${i}`,
-    agent
+    path: `/${i}`
   }, function(res) {
     const socket = req.socket;
     socket.on('close', common.mustCall(() => {
       countdown.dec();
       if (countdown.remaining > 0) {
-        assert.strictEqual(agent.sockets[name].includes(socket),
+        assert.strictEqual(http.globalAgent.sockets[name].includes(socket),
                            false);
       }
     }));
diff --git a/test/parallel/test-http-client-close-with-default-agent.js b/test/parallel/test-http-client-close-with-default-agent.js
deleted file mode 100644
index 8973f454e37728..00000000000000
--- a/test/parallel/test-http-client-close-with-default-agent.js
+++ /dev/null
@@ -1,23 +0,0 @@
-'use strict';
-
-const common = require('../common');
-const assert = require('assert');
-const http = require('http');
-
-const server = http.createServer(function(req, res) {
-  res.writeHead(200);
-  res.end();
-});
-
-server.listen(0, common.mustCall(() => {
-  const req = http.get({ port: server.address().port }, (res) => {
-    assert.strictEqual(res.statusCode, 200);
-    res.resume();
-    server.close();
-  });
-
-  req.end();
-}));
-
-// This timer should never go off as the server will close the socket
-setTimeout(common.mustNotCall(), common.platformTimeout(10000)).unref();
diff --git a/test/parallel/test-http-client-headers-array.js b/test/parallel/test-http-client-headers-array.js
index d7e8d39c3c2560..2665c3a97bcf77 100644
--- a/test/parallel/test-http-client-headers-array.js
+++ b/test/parallel/test-http-client-headers-array.js
@@ -10,7 +10,7 @@ function execute(options) {
     const expectHeaders = {
       'x-foo': 'boom',
       'cookie': 'a=1; b=2; c=3',
-      'connection': 'keep-alive'
+      'connection': 'close'
     };
 
     // no Host header when you set headers an array
@@ -28,7 +28,6 @@ function execute(options) {
 
     assert.deepStrictEqual(req.headers, expectHeaders);
 
-    res.writeHead(200, { 'Connection': 'close' });
     res.end();
   }).listen(0, function() {
     options = Object.assign(options, {
diff --git a/test/parallel/test-http-client-keep-alive-hint.js b/test/parallel/test-http-client-keep-alive-hint.js
deleted file mode 100644
index 2618dfd552f8ab..00000000000000
--- a/test/parallel/test-http-client-keep-alive-hint.js
+++ /dev/null
@@ -1,27 +0,0 @@
-'use strict';
-
-const common = require('../common');
-const assert = require('assert');
-const http = require('http');
-
-const server = http.createServer(
-  { keepAliveTimeout: common.platformTimeout(60000) },
-  function(req, res) {
-    req.resume();
-    res.writeHead(200, { 'Connection': 'keep-alive', 'Keep-Alive': 'timeout=1' });
-    res.end('FOO');
-  }
-);
-
-server.listen(0, common.mustCall(() => {
-  http.get({ port: server.address().port }, (res) => {
-    assert.strictEqual(res.statusCode, 200);
-
-    res.resume();
-    server.close();
-  });
-}));
-
-
-// This timer should never go off as the agent will parse the hint and terminate earlier
-setTimeout(common.mustNotCall(), common.platformTimeout(3000)).unref();
diff --git a/test/parallel/test-http-client-spurious-aborted.js b/test/parallel/test-http-client-spurious-aborted.js
index e5f0d41d2096ac..850462dadc76f8 100644
--- a/test/parallel/test-http-client-spurious-aborted.js
+++ b/test/parallel/test-http-client-spurious-aborted.js
@@ -10,7 +10,7 @@ const N = 2;
 let abortRequest = true;
 
 const server = http.Server(common.mustCall((req, res) => {
-  const headers = { 'Content-Type': 'text/plain', 'Connection': 'close' };
+  const headers = { 'Content-Type': 'text/plain' };
   headers['Content-Length'] = 50;
   const socket = res.socket;
   res.writeHead(200, headers);
diff --git a/test/parallel/test-http-client-timeout-on-connect.js b/test/parallel/test-http-client-timeout-on-connect.js
index 47b9fa800be527..3a0098229d9af8 100644
--- a/test/parallel/test-http-client-timeout-on-connect.js
+++ b/test/parallel/test-http-client-timeout-on-connect.js
@@ -13,10 +13,7 @@ const server = http.createServer((req, res) => {
 
 server.listen(0, common.localhostIPv4, common.mustCall(() => {
   const port = server.address().port;
-  const req = http.get(
-    `http://${common.localhostIPv4}:${port}`,
-    { agent: new http.Agent() }
-  );
+  const req = http.get(`http://${common.localhostIPv4}:${port}`);
 
   req.setTimeout(1);
   req.on('socket', common.mustCall((socket) => {
diff --git a/test/parallel/test-http-content-length.js b/test/parallel/test-http-content-length.js
index 193ee5a8831e60..e6ba3719f95ba6 100644
--- a/test/parallel/test-http-content-length.js
+++ b/test/parallel/test-http-content-length.js
@@ -5,17 +5,17 @@ const http = require('http');
 const Countdown = require('../common/countdown');
 
 const expectedHeadersMultipleWrites = {
-  'connection': 'keep-alive',
+  'connection': 'close',
   'transfer-encoding': 'chunked',
 };
 
 const expectedHeadersEndWithData = {
-  'connection': 'keep-alive',
-  'content-length': String('hello world'.length),
+  'connection': 'close',
+  'content-length': String('hello world'.length)
 };
 
 const expectedHeadersEndNoData = {
-  'connection': 'keep-alive',
+  'connection': 'close',
   'content-length': '0',
 };
 
@@ -24,7 +24,6 @@ const countdown = new Countdown(3, () => server.close());
 
 const server = http.createServer(function(req, res) {
   res.removeHeader('Date');
-  res.setHeader('Keep-Alive', 'timeout=1');
 
   switch (req.url.substr(1)) {
     case 'multiple-writes':
@@ -60,8 +59,7 @@ server.listen(0, function() {
   req.write('hello ');
   req.end('world');
   req.on('response', function(res) {
-    assert.deepStrictEqual(res.headers, { ...expectedHeadersMultipleWrites, 'keep-alive': 'timeout=1' });
-    res.resume();
+    assert.deepStrictEqual(res.headers, expectedHeadersMultipleWrites);
   });
 
   req = http.request({
@@ -73,8 +71,7 @@ server.listen(0, function() {
   req.removeHeader('Host');
   req.end('hello world');
   req.on('response', function(res) {
-    assert.deepStrictEqual(res.headers, { ...expectedHeadersEndWithData, 'keep-alive': 'timeout=1' });
-    res.resume();
+    assert.deepStrictEqual(res.headers, expectedHeadersEndWithData);
   });
 
   req = http.request({
@@ -86,8 +83,7 @@ server.listen(0, function() {
   req.removeHeader('Host');
   req.end();
   req.on('response', function(res) {
-    assert.deepStrictEqual(res.headers, { ...expectedHeadersEndNoData, 'keep-alive': 'timeout=1' });
-    res.resume();
+    assert.deepStrictEqual(res.headers, expectedHeadersEndNoData);
   });
 
 });
diff --git a/test/parallel/test-http-default-encoding.js b/test/parallel/test-http-default-encoding.js
index 0c0de0808ae8c2..8fcbf1a07f26ff 100644
--- a/test/parallel/test-http-default-encoding.js
+++ b/test/parallel/test-http-default-encoding.js
@@ -32,9 +32,9 @@ const server = http.Server((req, res) => {
   req.on('data', (chunk) => {
     result += chunk;
   }).on('end', () => {
+    server.close();
     res.writeHead(200);
     res.end('hello world\n');
-    server.close();
   });
 
 });
diff --git a/test/parallel/test-http-max-headers-count.js b/test/parallel/test-http-max-headers-count.js
index 94685b228845aa..b707c62bfba8c7 100644
--- a/test/parallel/test-http-max-headers-count.js
+++ b/test/parallel/test-http-max-headers-count.js
@@ -48,7 +48,7 @@ const server = http.createServer(function(req, res) {
     expected = maxAndExpected[requests][1];
     server.maxHeadersCount = max;
   }
-  res.writeHead(200, { ...headers, 'Connection': 'close' });
+  res.writeHead(200, headers);
   res.end();
 });
 server.maxHeadersCount = max;
diff --git a/test/parallel/test-http-outgoing-message-capture-rejection.js b/test/parallel/test-http-outgoing-message-capture-rejection.js
index a89ef8baf70605..a19176df415263 100644
--- a/test/parallel/test-http-outgoing-message-capture-rejection.js
+++ b/test/parallel/test-http-outgoing-message-capture-rejection.js
@@ -16,11 +16,9 @@ events.captureRejections = true;
 
     res.socket.on('error', common.mustCall((err) => {
       assert.strictEqual(err, _err);
-      server.close();
     }));
 
     // Write until there is space in the buffer
-    res.writeHead(200, { 'Connection': 'close' });
     while (res.write('hello'));
   }));
 
@@ -39,6 +37,7 @@ events.captureRejections = true;
         code: 'ECONNRESET'
       }));
       res.resume();
+      server.close();
     }));
   }));
 }
diff --git a/test/parallel/test-http-raw-headers.js b/test/parallel/test-http-raw-headers.js
index adc5bec1712201..d77a7cacc64c29 100644
--- a/test/parallel/test-http-raw-headers.js
+++ b/test/parallel/test-http-raw-headers.js
@@ -34,13 +34,13 @@ http.createServer(function(req, res) {
     'x-BaR',
     'yoyoyo',
     'Connection',
-    'keep-alive',
+    'close',
   ];
   const expectHeaders = {
     'host': `localhost:${this.address().port}`,
     'transfer-encoding': 'CHUNKED',
     'x-bar': 'yoyoyo',
-    'connection': 'keep-alive'
+    'connection': 'close'
   };
   const expectRawTrailers = [
     'x-bAr',
@@ -65,7 +65,6 @@ http.createServer(function(req, res) {
   });
 
   req.resume();
-  res.setHeader('Keep-Alive', 'timeout=1');
   res.setHeader('Trailer', 'x-foo');
   res.addTrailers([
     ['x-fOo', 'xOxOxOx'],
@@ -87,25 +86,22 @@ http.createServer(function(req, res) {
   req.end('y b a r');
   req.on('response', function(res) {
     const expectRawHeaders = [
-      'Keep-Alive',
-      'timeout=1',
       'Trailer',
       'x-foo',
       'Date',
       null,
       'Connection',
-      'keep-alive',
+      'close',
       'Transfer-Encoding',
       'chunked',
     ];
     const expectHeaders = {
-      'keep-alive': 'timeout=1',
       'trailer': 'x-foo',
       'date': null,
-      'connection': 'keep-alive',
+      'connection': 'close',
       'transfer-encoding': 'chunked'
     };
-    res.rawHeaders[5] = null;
+    res.rawHeaders[3] = null;
     res.headers.date = null;
     assert.deepStrictEqual(res.rawHeaders, expectRawHeaders);
     assert.deepStrictEqual(res.headers, expectHeaders);
diff --git a/test/parallel/test-http-request-end.js b/test/parallel/test-http-request-end.js
index d762f459db27f0..c9278945b7993b 100644
--- a/test/parallel/test-http-request-end.js
+++ b/test/parallel/test-http-request-end.js
@@ -36,9 +36,9 @@ const server = http.Server(function(req, res) {
 
   req.on('end', function() {
     assert.strictEqual(result, expected);
+    server.close();
     res.writeHead(200);
     res.end('hello world\n');
-    server.close();
   });
 
 });
diff --git a/test/parallel/test-http-should-keep-alive.js b/test/parallel/test-http-should-keep-alive.js
index 5cff29adbc54db..dfc99cf4f3b3a1 100644
--- a/test/parallel/test-http-should-keep-alive.js
+++ b/test/parallel/test-http-should-keep-alive.js
@@ -50,10 +50,6 @@ const getCountdownIndex = () => SERVER_RESPONSES.length - countdown.remaining;
 
 const server = net.createServer(function(socket) {
   socket.write(SERVER_RESPONSES[getCountdownIndex()]);
-
-  if (SHOULD_KEEP_ALIVE[getCountdownIndex()]) {
-    socket.end();
-  }
 }).listen(0, function() {
   function makeRequest() {
     const req = http.get({ port: server.address().port }, function(res) {
diff --git a/test/parallel/test-http-unix-socket-keep-alive.js b/test/parallel/test-http-unix-socket-keep-alive.js
index 36a3a4f535f07b..e1a2267e5c9689 100644
--- a/test/parallel/test-http-unix-socket-keep-alive.js
+++ b/test/parallel/test-http-unix-socket-keep-alive.js
@@ -20,7 +20,7 @@ server.listen(common.PIPE, common.mustCall(() =>
 function asyncLoop(fn, times, cb) {
   fn(function handler() {
     if (--times) {
-      setTimeout(() => fn(handler), common.platformTimeout(10));
+      fn(handler);
     } else {
       cb();
     }
diff --git a/test/parallel/test-https-agent-session-eviction.js b/test/parallel/test-https-agent-session-eviction.js
index 20cdb870a09ddb..940c43cc40bf15 100644
--- a/test/parallel/test-https-agent-session-eviction.js
+++ b/test/parallel/test-https-agent-session-eviction.js
@@ -19,7 +19,6 @@ const options = {
 
 // Create TLS1.2 server
 https.createServer(options, function(req, res) {
-  res.writeHead(200, { 'Connection': 'close' });
   res.end('ohai');
 }).listen(0, function() {
   first(this);
@@ -45,7 +44,6 @@ function first(server) {
 function faultyServer(port) {
   options.secureProtocol = 'TLSv1_method';
   https.createServer(options, function(req, res) {
-    res.writeHead(200, { 'Connection': 'close' });
     res.end('hello faulty');
   }).listen(port, function() {
     second(this);
diff --git a/test/parallel/test-https-max-headers-count.js b/test/parallel/test-https-max-headers-count.js
index 0fdd38c73ed6f1..f8e4e64bfb94dd 100644
--- a/test/parallel/test-https-max-headers-count.js
+++ b/test/parallel/test-https-max-headers-count.js
@@ -37,7 +37,7 @@ const server = https.createServer(serverOptions, common.mustCall((req, res) => {
     expected = maxAndExpected[requests][1];
     server.maxHeadersCount = max;
   }
-  res.writeHead(200, { ...headers, 'Connection': 'close' });
+  res.writeHead(200, headers);
   res.end();
 }, 3));
 server.maxHeadersCount = max;
diff --git a/test/parallel/test-stream-destroy.js b/test/parallel/test-stream-destroy.js
index 77c3a0aaa3fea5..f99c29c811932d 100644
--- a/test/parallel/test-stream-destroy.js
+++ b/test/parallel/test-stream-destroy.js
@@ -62,8 +62,7 @@ const http = require('http');
 
   server.listen(0, () => {
     const req = http.request({
-      port: server.address().port,
-      agent: new http.Agent()
+      port: server.address().port
     });
 
     req.write('asd');
@@ -97,8 +96,7 @@ const http = require('http');
 
   server.listen(0, () => {
     const req = http.request({
-      port: server.address().port,
-      agent: new http.Agent()
+      port: server.address().port
     });
 
     req.write('asd');
diff --git a/test/parallel/test-tls-over-http-tunnel.js b/test/parallel/test-tls-over-http-tunnel.js
index 503ec1f6600f5f..b26cf7872f6582 100644
--- a/test/parallel/test-tls-over-http-tunnel.js
+++ b/test/parallel/test-tls-over-http-tunnel.js
@@ -62,7 +62,7 @@ const proxy = net.createServer((clientSocket) => {
                          'HTTP/1.1\r\n' +
                          'Proxy-Connections: keep-alive\r\n' +
                          `Host: localhost:${proxy.address().port}\r\n` +
-                         'Connection: keep-alive\r\n\r\n');
+                         'Connection: close\r\n\r\n');
 
       console.log('PROXY: got CONNECT request');
       console.log('PROXY: creating a tunnel');
diff --git a/test/parallel/test-tls-set-secure-context.js b/test/parallel/test-tls-set-secure-context.js
index f41a94cbf229b8..d62b6b9f94f601 100644
--- a/test/parallel/test-tls-set-secure-context.js
+++ b/test/parallel/test-tls-set-secure-context.js
@@ -82,8 +82,7 @@ function makeRequest(port, id) {
       rejectUnauthorized: true,
       ca: credentialOptions[0].ca,
       servername: 'agent1',
-      headers: { id },
-      agent: new https.Agent()
+      headers: { id }
     };
 
     let errored = false;
diff --git a/test/sequential/test-http-econnrefused.js b/test/sequential/test-http-econnrefused.js
index 7f8c2cee56c4c8..e1abde32bd81b1 100644
--- a/test/sequential/test-http-econnrefused.js
+++ b/test/sequential/test-http-econnrefused.js
@@ -43,7 +43,7 @@ const server = http.createServer(function(req, res) {
 
   req.on('end', function() {
     assert.strictEqual(body, 'PING');
-    res.writeHead(200, { 'Connection': 'close' });
+    res.writeHead(200);
     res.end('PONG');
   });
 });