diff --git a/doc/api/http.md b/doc/api/http.md
index 09a51b42dbaf45..0fb22f52e92445 100644
--- a/doc/api/http.md
+++ b/doc/api/http.md
@@ -117,6 +117,10 @@ http.get({
 <!-- YAML
 added: v0.3.4
 changes:
+  - version:
+      - CHANGEME
+    pr-url: https://github.com/nodejs/node/pull/42163/files
+    description: Changed the default value of `keepAlive` to `true`.
   - version:
       - v15.6.0
       - v14.17.0
@@ -144,11 +148,11 @@ changes:
     header is always sent when using an agent except when the `Connection`
     header is explicitly specified or when the `keepAlive` and `maxSockets`
     options are respectively set to `false` and `Infinity`, in which case
-    `Connection: close` will be used. **Default:** `false`.
+    `Connection: close` will be used. **Default:** `true`.
   * `keepAliveMsecs` {number} When using the `keepAlive` option, specifies
     the [initial delay][]
     for TCP Keep-Alive packets. Ignored when the
-    `keepAlive` option is `false` or `undefined`. **Default:** `1000`.
+    `keepAlive` option is `false`. **Default:** `1000`.
   * `maxSockets` {number} Maximum number of sockets to allow per host.
     If the same host opens multiple concurrent connections, each request
     will use new socket until the `maxSockets` value is reached.
@@ -2838,6 +2842,12 @@ Found'`.
 <!-- YAML
 added: v0.1.13
 changes:
+  - version:
+      - CHANGEME
+    pr-url: https://github.com/nodejs/node/pull/42163/files
+    description: Changed the default value of `noDelay` and `keepAlive` 
+                 to `true`. Changed the default value of `keepAliveInitialDelay`
+                 to `1000`.
   - version:
      - v13.8.0
      - v12.15.0
@@ -2871,14 +2881,14 @@ changes:
     **Default:** 16384 (16 KB).
   * `noDelay` {boolean} If set to `true`, it disables the use of Nagle's
     algorithm immediately after a new incoming connection is received.
-    **Default:** `false`.
+    **Default:** `true`.
   * `keepAlive` {boolean} If set to `true`, it enables keep-alive functionality
     on the socket immediately after a new incoming connection is received,
     similarly on what is done in \[`socket.setKeepAlive([enable][, initialDelay])`]\[`socket.setKeepAlive(enable, initialDelay)`].
-    **Default:** `false`.
+    **Default:** `true`.
   * `keepAliveInitialDelay` {number} If set to a positive number, it sets the
     initial delay before the first keepalive probe is sent on an idle socket.
-    **Default:** `0`.
+    **Default:** `1000`.
 
 * `requestListener` {Function}
 
diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index 28759a91c4f5a1..6da1fe6c62f366 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -101,13 +101,21 @@ function Agent(options) {
 
   this.options = { __proto__: null, ...options };
 
+  if (this.options.noDelay === undefined)
+    this.options.noDelay = true;
+  if (this.options.keepAlive === undefined)
+    this.options.keepAlive = true;
+  if (this.options.keepAliveInitialDelay === undefined)
+    this.options.keepAliveInitialDelay = 1000;
+
   // Don't confuse net and make it think that we're connecting to a pipe
   this.options.path = null;
   this.requests = ObjectCreate(null);
   this.sockets = ObjectCreate(null);
   this.freeSockets = ObjectCreate(null);
-  this.keepAliveMsecs = this.options.keepAliveMsecs || 1000;
-  this.keepAlive = this.options.keepAlive || false;
+  this.keepAliveMsecs =
+    this.options.keepAliveMsecs || this.options.keepAliveInitialDelay || 1000;
+  this.keepAlive = this.options.keepAlive;
   this.maxSockets = this.options.maxSockets || Agent.defaultMaxSockets;
   this.maxFreeSockets = this.options.maxFreeSockets || 256;
   this.scheduling = this.options.scheduling || 'lifo';
diff --git a/lib/_http_server.js b/lib/_http_server.js
index 18127f0d19b3d5..33a00d7dc098a7 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -363,6 +363,13 @@ function storeHTTPOptions(options) {
   if (insecureHTTPParser !== undefined)
     validateBoolean(insecureHTTPParser, 'options.insecureHTTPParser');
   this.insecureHTTPParser = insecureHTTPParser;
+
+  if (options.noDelay === undefined)
+    options.noDelay = true;
+  if (options.keepAlive === undefined)
+    options.keepAlive = true;
+  if (options.keepAliveInitialDelay === undefined)
+    options.keepAliveInitialDelay = 1000;
 }
 
 function Server(options, requestListener) {
diff --git a/test/async-hooks/test-graph.http.js b/test/async-hooks/test-graph.http.js
index 3e36646e54e2ee..562118d01ccf58 100644
--- a/test/async-hooks/test-graph.http.js
+++ b/test/async-hooks/test-graph.http.js
@@ -19,8 +19,9 @@ server.listen(0, common.mustCall(() => {
   http.get({
     host: '::1',
     family: 6,
-    port: server.address().port
-  }, common.mustCall());
+    port: server.address().port,
+    headers: { connection: 'close' }
+  }, common.mustCall(() => {}));
 }));
 
 process.on('exit', () => {
diff --git a/test/parallel/test-child-process-http-socket-leak.js b/test/parallel/test-child-process-http-socket-leak.js
index cae4b051bc2b35..e9f282f2a21d1f 100644
--- a/test/parallel/test-child-process-http-socket-leak.js
+++ b/test/parallel/test-child-process-http-socket-leak.js
@@ -49,6 +49,7 @@ server.listen(0, common.mustCall(() => {
         assert.strictEqual(socket[kTimeout], null);
         assert.strictEqual(socket.parser, null);
         assert.strictEqual(socket._httpMessage, null);
+        res.req.socket.end();
       }));
     }));
 
diff --git a/test/parallel/test-http-client-agent.js b/test/parallel/test-http-client-agent.js
index 77616edd99d2fb..ca5eee5ec1aeb1 100644
--- a/test/parallel/test-http-client-agent.js
+++ b/test/parallel/test-http-client-agent.js
@@ -31,11 +31,11 @@ const max = 3;
 const server = http.Server(common.mustCall((req, res) => {
   if (req.url === '/0') {
     setTimeout(common.mustCall(() => {
-      res.writeHead(200);
+      res.writeHead(200, { connection: 'close' });
       res.end('Hello, World!');
     }), 100);
   } else {
-    res.writeHead(200);
+    res.writeHead(200, { connection: 'close' });
     res.end('Hello, World!');
   }
 }, max));
diff --git a/test/parallel/test-http-client-headers-array.js b/test/parallel/test-http-client-headers-array.js
index 2665c3a97bcf77..7bdc9e3ca85910 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': 'close'
+      'connection': 'keep-alive'
     };
 
     // no Host header when you set headers an array
diff --git a/test/parallel/test-http-client-readable.js b/test/parallel/test-http-client-readable.js
index c35ab259f25f2b..3d904d5a17df02 100644
--- a/test/parallel/test-http-client-readable.js
+++ b/test/parallel/test-http-client-readable.js
@@ -53,6 +53,8 @@ class FakeAgent extends http.Agent {
 
     return s;
   }
+
+  keepSocketAlive() {}
 }
 
 let received = '';
diff --git a/test/parallel/test-http-client-spurious-aborted.js b/test/parallel/test-http-client-spurious-aborted.js
index 850462dadc76f8..48f3eb28f27d43 100644
--- a/test/parallel/test-http-client-spurious-aborted.js
+++ b/test/parallel/test-http-client-spurious-aborted.js
@@ -40,7 +40,7 @@ function download() {
   req.on('error', common.mustNotCall());
   req.on('response', (res) => {
     assert.strictEqual(res.statusCode, 200);
-    assert.strictEqual(res.headers.connection, 'close');
+    assert.strictEqual(res.headers.connection, 'keep-alive');
     let aborted = false;
     const writable = new Writable({
       write(chunk, encoding, callback) {
diff --git a/test/parallel/test-http-content-length.js b/test/parallel/test-http-content-length.js
index e6ba3719f95ba6..1110311ff7bbb4 100644
--- a/test/parallel/test-http-content-length.js
+++ b/test/parallel/test-http-content-length.js
@@ -24,19 +24,29 @@ const countdown = new Countdown(3, () => server.close());
 
 const server = http.createServer(function(req, res) {
   res.removeHeader('Date');
+  res.setHeader('connection', 'close');
 
   switch (req.url.substr(1)) {
     case 'multiple-writes':
-      assert.deepStrictEqual(req.headers, expectedHeadersMultipleWrites);
+      assert.deepStrictEqual(
+        req.headers,
+        { ...expectedHeadersMultipleWrites, 'connection': 'keep-alive' }
+      );
       res.write('hello');
       res.end('world');
       break;
     case 'end-with-data':
-      assert.deepStrictEqual(req.headers, expectedHeadersEndWithData);
+      assert.deepStrictEqual(
+        req.headers,
+        { ...expectedHeadersEndWithData, 'connection': 'keep-alive' }
+      );
       res.end('hello world');
       break;
     case 'empty':
-      assert.deepStrictEqual(req.headers, expectedHeadersEndNoData);
+      assert.deepStrictEqual(
+        req.headers,
+        { ...expectedHeadersEndNoData, 'connection': 'keep-alive' }
+      );
       res.end();
       break;
     default:
diff --git a/test/parallel/test-http-dump-req-when-res-ends.js b/test/parallel/test-http-dump-req-when-res-ends.js
index 01dbbca1b393fb..c7d9ec9a0aa666 100644
--- a/test/parallel/test-http-dump-req-when-res-ends.js
+++ b/test/parallel/test-http-dump-req-when-res-ends.js
@@ -55,6 +55,7 @@ server.listen(0, mustCall(function() {
     // invalidate the test.
     res.on('close', function() {
       server.close();
+      res.req.socket.end();
     });
   }));
 
diff --git a/test/parallel/test-http-max-headers-count.js b/test/parallel/test-http-max-headers-count.js
index b707c62bfba8c7..f004fd772240c3 100644
--- a/test/parallel/test-http-max-headers-count.js
+++ b/test/parallel/test-http-max-headers-count.js
@@ -66,7 +66,7 @@ server.listen(0, function() {
     const expected = maxAndExpected[responses][1];
     const req = http.request({
       port: server.address().port,
-      headers: headers
+      headers: { connection: 'close', ...headers }
     }, function(res) {
       assert.strictEqual(Object.keys(res.headers).length, expected);
       res.on('end', function() {
diff --git a/test/parallel/test-http-nodelay.js b/test/parallel/test-http-nodelay.js
new file mode 100644
index 00000000000000..62b5776c2b773b
--- /dev/null
+++ b/test/parallel/test-http-nodelay.js
@@ -0,0 +1,42 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+const net = require('net');
+
+const originalConnect = net.Socket.prototype.connect;
+
+net.Socket.prototype.connect = common.mustCall(function(args) {
+  assert.strictEqual(args[0].noDelay, true);
+  assert.strictEqual(args[0].keepAlive, true);
+  assert.strictEqual(args[0].keepAliveInitialDelay, 1000);
+  return originalConnect.call(this, args);
+});
+
+const server = http.createServer(common.mustCall((req, res) => {
+  res.writeHead(200);
+  res.end();
+  server.close();
+}));
+
+server.listen(0, common.mustCall(() => {
+  assert.strictEqual(server.noDelay, true);
+  assert.strictEqual(server.keepAlive, true);
+  // Value is converted to second from net.Server
+  assert.strictEqual(server.keepAliveInitialDelay, 1);
+
+  const req = http.request({
+    method: 'GET',
+    port: server.address().port
+  }, common.mustCall((res) => {
+    res.on('end', () => {
+      server.close();
+      res.req.socket.end();
+    });
+
+    res.resume();
+  }));
+
+  req.end();
+}));
diff --git a/test/parallel/test-http-pause-no-dump.js b/test/parallel/test-http-pause-no-dump.js
index b794634c489326..977eb3317912cf 100644
--- a/test/parallel/test-http-pause-no-dump.js
+++ b/test/parallel/test-http-pause-no-dump.js
@@ -26,6 +26,7 @@ server.on('listening', common.mustCall(function() {
     res.resume();
     res.on('end', common.mustCall(() => {
       server.close();
+      res.req.socket.end();
     }));
   }));
 
diff --git a/test/parallel/test-http-raw-headers.js b/test/parallel/test-http-raw-headers.js
index d77a7cacc64c29..65499579b40ca5 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',
-    'close',
+    'keep-alive',
   ];
   const expectHeaders = {
     'host': `localhost:${this.address().port}`,
     'transfer-encoding': 'CHUNKED',
     'x-bar': 'yoyoyo',
-    'connection': 'close'
+    'connection': 'keep-alive'
   };
   const expectRawTrailers = [
     'x-bAr',
@@ -91,14 +91,17 @@ http.createServer(function(req, res) {
       'Date',
       null,
       'Connection',
-      'close',
+      'keep-alive',
+      'Keep-Alive',
+      'timeout=5',
       'Transfer-Encoding',
       'chunked',
     ];
     const expectHeaders = {
       'trailer': 'x-foo',
       'date': null,
-      'connection': 'close',
+      'connection': 'keep-alive',
+      'keep-alive': 'timeout=5',
       'transfer-encoding': 'chunked'
     };
     res.rawHeaders[3] = null;
@@ -121,6 +124,7 @@ http.createServer(function(req, res) {
       assert.deepStrictEqual(res.rawTrailers, expectRawTrailers);
       assert.deepStrictEqual(res.trailers, expectTrailers);
       console.log('ok');
+      req.socket.end();
     });
     res.resume();
   });
diff --git a/test/parallel/test-http-request-large-payload.js b/test/parallel/test-http-request-large-payload.js
index 3be100b740417f..5f42696188fc1c 100644
--- a/test/parallel/test-http-request-large-payload.js
+++ b/test/parallel/test-http-request-large-payload.js
@@ -8,7 +8,7 @@ require('../common');
 const http = require('http');
 
 const server = http.createServer(function(req, res) {
-  res.writeHead(200);
+  res.writeHead(200, { connection: 'close' });
   res.end();
 
   server.close();
diff --git a/test/parallel/test-http-should-keep-alive.js b/test/parallel/test-http-should-keep-alive.js
index dfc99cf4f3b3a1..e3710b4acbe4b8 100644
--- a/test/parallel/test-http-should-keep-alive.js
+++ b/test/parallel/test-http-should-keep-alive.js
@@ -50,6 +50,7 @@ const getCountdownIndex = () => SERVER_RESPONSES.length - countdown.remaining;
 
 const server = net.createServer(function(socket) {
   socket.write(SERVER_RESPONSES[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 e1a2267e5c9689..893b5774bf3d55 100644
--- a/test/parallel/test-http-unix-socket-keep-alive.js
+++ b/test/parallel/test-http-unix-socket-keep-alive.js
@@ -11,7 +11,7 @@ tmpdir.refresh();
 server.listen(common.PIPE, common.mustCall(() =>
   asyncLoop(makeKeepAliveRequest, 10, common.mustCall(() =>
     server.getConnections(common.mustSucceed((conns) => {
-      assert.strictEqual(conns, 1);
+      assert.strictEqual(conns, 2);
       server.close();
     }))
   ))
diff --git a/test/parallel/test-http2-https-fallback-http-server-options.js b/test/parallel/test-http2-https-fallback-http-server-options.js
index 8143f56d491ccc..0868395d237e2c 100644
--- a/test/parallel/test-http2-https-fallback-http-server-options.js
+++ b/test/parallel/test-http2-https-fallback-http-server-options.js
@@ -82,6 +82,7 @@ class MyServerResponse extends http.ServerResponse {
           assert.strictEqual(userAgent, 'node-test');
 
           server.close();
+          response.req.socket.end();
         }));
       })
     );
diff --git a/test/parallel/test-http2-https-fallback.js b/test/parallel/test-http2-https-fallback.js
index a872d686d34f85..566ce956429317 100644
--- a/test/parallel/test-http2-https-fallback.js
+++ b/test/parallel/test-http2-https-fallback.js
@@ -100,6 +100,7 @@ function onSession(session, next) {
           strictEqual(alpnProtocol, false);
           strictEqual(httpVersion, '1.1');
 
+          response.req.socket.end();
           cleanup();
         }));
       })
diff --git a/test/parallel/test-https-agent-session-eviction.js b/test/parallel/test-https-agent-session-eviction.js
index 940c43cc40bf15..2be59732cfecba 100644
--- a/test/parallel/test-https-agent-session-eviction.js
+++ b/test/parallel/test-https-agent-session-eviction.js
@@ -19,6 +19,7 @@ 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);
diff --git a/test/parallel/test-https-agent-session-reuse.js b/test/parallel/test-https-agent-session-reuse.js
index 485f4b1ca308c9..b12cfaaf84c733 100644
--- a/test/parallel/test-https-agent-session-reuse.js
+++ b/test/parallel/test-https-agent-session-reuse.js
@@ -96,6 +96,8 @@ const server = https.createServer(options, function(req, res) {
   function request() {
     const options = queue.shift();
     options.agent = agent;
+    options.headers = { ...options.headers, connection: 'close' };
+
     https.request(options, function(res) {
       clientSessions[options.name] = res.socket.getSession();
 
diff --git a/test/parallel/test-https-agent-sockets-leak.js b/test/parallel/test-https-agent-sockets-leak.js
index 15409d33dbd86a..a3d6184cf11e9a 100644
--- a/test/parallel/test-https-agent-sockets-leak.js
+++ b/test/parallel/test-https-agent-sockets-leak.js
@@ -27,7 +27,7 @@ server.listen(0, common.mustCall(() => {
   https.get({
     host: server.address().host,
     port: server.address().port,
-    headers: { host: 'agent1' },
+    headers: { host: 'agent1', connection: 'close' },
     rejectUnauthorized: true,
     ca: options.ca,
     agent: agent
diff --git a/test/parallel/test-https-max-headers-count.js b/test/parallel/test-https-max-headers-count.js
index f8e4e64bfb94dd..208ddb2f4e8b1a 100644
--- a/test/parallel/test-https-max-headers-count.js
+++ b/test/parallel/test-https-max-headers-count.js
@@ -53,7 +53,7 @@ server.listen(0, common.mustCall(() => {
     const expected = maxAndExpected[responses][1];
     const req = https.request({
       port: server.address().port,
-      headers: headers,
+      headers: { connection: 'close', ...headers },
       rejectUnauthorized: false
     }, (res) => {
       assert.strictEqual(Object.keys(res.headers).length, expected);
diff --git a/test/parallel/test-stream-destroy.js b/test/parallel/test-stream-destroy.js
index f99c29c811932d..31d2c45bcae621 100644
--- a/test/parallel/test-stream-destroy.js
+++ b/test/parallel/test-stream-destroy.js
@@ -62,7 +62,8 @@ const http = require('http');
 
   server.listen(0, () => {
     const req = http.request({
-      port: server.address().port
+      port: server.address().port,
+      headers: { connection: 'close' }
     });
 
     req.write('asd');
@@ -77,6 +78,7 @@ const http = require('http');
         server.close();
       }));
     });
+    req.end();
   });
 }
 
@@ -96,7 +98,8 @@ const http = require('http');
 
   server.listen(0, () => {
     const req = http.request({
-      port: server.address().port
+      port: server.address().port,
+      headers: { connection: 'close' }
     });
 
     req.write('asd');
diff --git a/test/parallel/test-tls-over-http-tunnel.js b/test/parallel/test-tls-over-http-tunnel.js
index b26cf7872f6582..503ec1f6600f5f 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: close\r\n\r\n');
+                         'Connection: keep-alive\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 d62b6b9f94f601..bbee4ff0b60a75 100644
--- a/test/parallel/test-tls-set-secure-context.js
+++ b/test/parallel/test-tls-set-secure-context.js
@@ -36,6 +36,7 @@ const server = https.createServer(credentialOptions[0], (req, res) => {
     firstResponse.write('success-');
   }
 
+  res.writeHead(200, { connection: 'close' });
   res.end('success');
 });
 
diff --git a/test/sequential/test-http-econnrefused.js b/test/sequential/test-http-econnrefused.js
index e1abde32bd81b1..a6a04845532b24 100644
--- a/test/sequential/test-http-econnrefused.js
+++ b/test/sequential/test-http-econnrefused.js
@@ -107,7 +107,8 @@ function ping() {
   const opt = {
     port: common.PORT,
     path: '/ping',
-    method: 'POST'
+    method: 'POST',
+    headers: { connection: 'close' }
   };
 
   const req = http.request(opt, function(res) {
diff --git a/test/sequential/test-http-keep-alive-large-write.js b/test/sequential/test-http-keep-alive-large-write.js
index 4119c2353daa53..a0aa500f82ea72 100644
--- a/test/sequential/test-http-keep-alive-large-write.js
+++ b/test/sequential/test-http-keep-alive-large-write.js
@@ -42,6 +42,9 @@ server.listen(0, common.mustCall(() => {
       socket._onTimeout();
       res.on('data', () => {});
     });
-    res.on('end', () => server.close());
+    res.on('end', () => {
+      server.close();
+      res.req.socket.end();
+    });
   });
 }));