fix: HTTP2 tweaks (nodejs#2711)

Co-authored-by: Khafra <maitken033380023@gmail.com>

lib/client.js

@@ -808,6 +808,7 @@ class Parser {
       .removeListener('close', onSocketClose)
 
     client[kSocket] = null
+    client[kHTTP2Session] = null
     client[kQueue][client[kRunningIdx]++] = null
     client.emit('disconnect', client[kUrl], [client], new InformationalError('upgrade'))
 
@@ -1421,7 +1422,7 @@ function _resume (client, sync) {
       return
     }
 
-    if (!socket && !client[kHTTP2Session]) {
+    if (!socket) {
       connect(client)
       return
     }
@@ -1796,7 +1797,25 @@ function writeH2 (client, session, request) {
   })
 
   stream.once('end', () => {
-    request.onComplete([])
+    // When state is null, it means we haven't consumed body and the stream still do not have
+    // a state.
+    // Present specially when using pipeline or stream
+    if (stream.state?.state == null || stream.state.state < 6) {
+      request.onComplete([])
+      return
+    }
+
+    // Stream is closed or half-closed-remote (6), decrement counter and cleanup
+    // It does not have sense to continue working with the stream as we do not
+    // have yet RST_STREAM support on client-side
+    h2State.openStreams -= 1
+    if (h2State.openStreams === 0) {
+      session.unref()
+    }
+
+    const err = new InformationalError('HTTP/2: stream half-closed (remote)')
+    errorRequest(client, request, err)
+    util.destroy(stream, err)
   })
 
   stream.on('data', (chunk) => {

test/http2.js

@@ -13,7 +13,7 @@ const { Client, Agent } = require('..')
 
 const isGreaterThanv20 = process.versions.node.split('.').map(Number)[0] >= 20
 
-plan(24)
+plan(25)
 
 test('Should support H2 connection', async t => {
   const body = []
@@ -1243,3 +1243,33 @@ test('The h2 pseudo-headers is not included in the headers', async t => {
   t.equal(response.statusCode, 200)
   t.equal(response.headers[':status'], undefined)
 })
+
+test('Should throw informational error on half-closed streams (remote)', async t => {
+  const server = createSecureServer(pem)
+
+  server.on('stream', (stream, headers) => {
+    stream.destroy()
+  })
+
+  server.listen(0)
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  t.plan(2)
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  await client.request({
+    path: '/',
+    method: 'GET'
+  }).catch(err => {
+    t.equal(err.message, 'HTTP/2: stream half-closed (remote)')
+    t.equal(err.code, 'UND_ERR_INFO')
+  })
+})