in src/main/java/org/apache/tinkerpop/gremlin/driver/SigV4WebSocketChannelizer.java [236:248]
private WebSocketClientHandler createHandler() {
WebSocketClientHandshaker handshaker = new AwsSigV4ClientHandshaker(
connection.getUri(),
WebSocketVersion.V13,
null,
true, // allow extensions to support WebSocket compression
EmptyHttpHeaders.INSTANCE,
cluster.getMaxContentLength(),
new ChainedSigV4PropertiesProvider(),
getCredentialsProvider());
return new WebSocketClientHandler(handshaker, cluster.getConnectionSetupTimeout());
}