HTTPCORE-762: H2 protocol handler incorrectly determines the maximum …

…frame size for outgoing frames in case the remote endpoint negotiated a max frame size larger than the protocol default

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

@@ -351,7 +351,7 @@ private int streamData(
             if (capacity <= 0) {
                 return 0;
             }
-            final int maxPayloadSize = Math.min(capacity, remoteConfig.getMaxFrameSize());
+            final int maxPayloadSize = Math.min(capacity, outputBuffer.getMaxFramePayloadSize());
             final int chunk;
             if (payload.remaining() <= maxPayloadSize) {
                 chunk = payload.remaining();