http2: Expose Http2ServerRequest/Response

In order for express (and possibly other libraries) to get and use
the Http2ServerRequest/Response - expose them in the http2 exports.
Same as is done in http module.

PR-URL: https://github.com/nodejs/node/pull/14690
Ref: https://github.com/expressjs/express/issues/3390
Fixes: https://github.com/nodejs/node/issues/14672
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/http2.js

@@ -13,7 +13,9 @@ const {
   getUnpackedSettings,
   createServer,
   createSecureServer,
-  connect
+  connect,
+  Http2ServerRequest,
+  Http2ServerResponse,
 } = require('internal/http2/core');
 
 module.exports = {
@@ -23,5 +25,7 @@ module.exports = {
   getUnpackedSettings,
   createServer,
   createSecureServer,
-  connect
+  connect,
+  Http2ServerResponse,
+  Http2ServerRequest,
 };

lib/internal/http2/compat.js

@@ -573,4 +573,8 @@ function onServerStream(stream, headers, flags) {
   server.emit('request', request, response);
 }
 
-module.exports = { onServerStream };
+module.exports = {
+  onServerStream,
+  Http2ServerRequest,
+  Http2ServerResponse,
+};

lib/internal/http2/core.js

@@ -15,7 +15,10 @@ const fs = require('fs');
 const errors = require('internal/errors');
 const { Duplex } = require('stream');
 const { URL } = require('url');
-const { onServerStream } = require('internal/http2/compat');
+const { onServerStream,
+        Http2ServerRequest,
+        Http2ServerResponse,
+} = require('internal/http2/compat');
 const { utcDate } = require('internal/http');
 const { _connectionListener: httpConnectionListener } = require('http');
 const { isUint8Array } = process.binding('util');
@@ -2552,7 +2555,9 @@ module.exports = {
   getUnpackedSettings,
   createServer,
   createSecureServer,
-  connect
+  connect,
+  Http2ServerRequest,
+  Http2ServerResponse
 };
 
 /* eslint-enable no-use-before-define */

test/parallel/test-http2-request-response-proto.js

@@ -0,0 +1,19 @@
+// Flags: --expose-http2
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const assert = require('assert');
+const http2 = require('http2');
+
+const {
+  Http2ServerRequest,
+  Http2ServerResponse,
+} = http2;
+
+const protoRequest = Object.create(Http2ServerRequest.prototype);
+const protoResponse = Object.create(Http2ServerResponse.prototype);
+
+assert.strictEqual(protoRequest instanceof Http2ServerRequest, true);
+assert.strictEqual(protoResponse instanceof Http2ServerResponse, true);