chore: add sample app

It is a static file server that uses `fastify` and the
`fastify-auto-push` plugin.

.gitignore

@@ -2,4 +2,4 @@
 /.vscode
 /build
 /coverage
-/node_modules
+node_modules

samples/static-page/README.md

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+# Sample code using the `fastify-auto-push` plugin
+
+**This is not an official Google product.**
+
+This application is a simple static file server built on top of `fastify` and
+`fastify-auto-push`.
+
+## Command-line flags
+
+* `--port <number>` or `-p <number>`
+
+  Specifies the port number to be used. Defaults to 3000.
+
+* `--http2` or `--h2`
+
+  Use HTTP/2 when specified, HTTP/1 otherwise.
+
+* `--auto-push` or `--ap`
+
+  Enable auto-push. Works only with `--http2`.
+
+## Copyright of the static contents
+
+CC BY-SA
+
+The files under the `static` directory are obtained from the [Wikipedia page
+on Node.js](https://en.wikipedia.org/wiki/Node.js).
+
+See https://en.wikipedia.org/wiki/Wikipedia:Copyrights for the Wikipedia's
+copyright details.

samples/static-page/certs/server.crt

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+-----BEGIN CERTIFICATE-----
+MIIDEjCCAfoCCQCerbweIrWbljANBgkqhkiG9w0BAQsFADBLMQswCQYDVQQGEwJV
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+BdyEQExykaJ/+Gy/DOj3UBbvznsevw==
+-----END CERTIFICATE-----

samples/static-page/certs/server.csr

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+-----BEGIN CERTIFICATE REQUEST-----
+MIICqDCCAZACAQAwSzELMAkGA1UEBhMCVVMxEzARBgNVBAgMCkNhbGlmb3JuaWEx
+FjAUBgNVBAcMDU1vdW50YWluIFZpZXcxDzANBgNVBAoMBkdvb2dsZTCCASIwDQYJ
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+I8JhT5qCCo8fW60i
+-----END CERTIFICATE REQUEST-----

samples/static-page/certs/server.key

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+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAuSe3EHzSuAnPy9WgdMjJLcQovvdGloNe4SKC2+j4+Md2lad+
+z5D6Nuag9+rCZJ2VTEvtd21IJiNPWanSPlx/EFMl7vD9kG89AGZBeNak068DWiMt
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+xPDJRhPIrBH3Zf8plT0yAPdlwk/hPo6mbx8IGuSSI67lUJSm914a
+-----END RSA PRIVATE KEY-----

samples/static-page/index.js

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+// Copyright 2018 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const {ArgumentParser} = require('argparse');
+const fastify = require('fastify');
+const fastifyAutoPush = require('fastify-auto-push');
+const fastifyStatic = require('fastify-static');
+const fs = require('fs');
+const path = require('path');
+const {promisify} = require('util');
+
+const {description, version} = require('./package.json');
+
+const argParser = new ArgumentParser({
+  version,
+  description,
+  addHelp: true,
+});
+argParser.addArgument(['--port', '-p'], {
+  type: Number,
+  defaultValue: 3000,
+  help: 'Port number. Defaults to 3000.',
+});
+argParser.addArgument(['--http2', '--h2'], {
+  nargs: 0,
+  help: 'Use HTTP/2. Defaults to true.',
+});
+argParser.addArgument(['--auto-push', '--ap'], {
+  nargs: 0,
+  dest: 'autoPush',
+  help: 'Enable auto-push. Works only with --http2.',
+});
+const args = argParser.parseArgs();
+if (args.autoPush && !args.http2) {
+  console.warn('--auto-push is supported only with --http2. Ignoring.');
+  args.autoPush = false;
+}
+
+const fsReadFile = promisify(fs.readFile);
+
+const STATIC_DIR = path.join(__dirname, 'static');
+const CERTS_DIR = path.join(__dirname, 'certs');
+
+async function createServerOptions() {
+  const readCertFile = (filename) => {
+    return fsReadFile(path.join(CERTS_DIR, filename));
+  };
+  const [key, cert] = await Promise.all(
+      [readCertFile('server.key'), readCertFile('server.crt')]);
+  return {key, cert};
+}
+
+async function main() {
+  const {key, cert} = await createServerOptions();
+  const app = fastify({
+    https: {key, cert},
+    http2: args.http2,
+  });
+  if (args.autoPush) {
+    // Create and register AutoPush plugin. It should be registered as the first
+    // in the middleware chain.
+    app.register(fastifyAutoPush.staticServe, {root: STATIC_DIR});
+  } else {
+    app.register(fastifyStatic, {root: STATIC_DIR});
+  }
+  app.listen(args.port, (err) => {
+    if (err) throw err;
+    console.log(`Listening on port ${args.port}`);
+  });
+}
+
+main().catch((err) => {
+  console.error(err);
+});