apply to server-initiated streams

Author: arturobernalg

httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java

@@ -1239,6 +1239,12 @@ private void produceOutput() throws HttpException, IOException {
             final Map.Entry<Integer, H2Stream> entry = it.next();
             final H2Stream stream = entry.getValue();
             if (!stream.isLocalClosed() && stream.getOutputWindow().get() > 0) {
+                if (!stream.isRemoteInitiated() && stream.channel.idle) {
+                    final int outboundLimit = remoteConfig.getMaxConcurrentStreams();
+                    if (countActiveLocalInitiated() >= outboundLimit) {
+                        continue;
+                    }
+                }
                 stream.produceOutput();
             }
             if (stream.isTerminated()) {