in hpack/src/main/java/com/twitter/hpack/Decoder.java [475:490]
private void insertHeader(HeaderListener headerListener, byte[] name, byte[] value, IndexType indexType) {
addHeader(headerListener, name, value, indexType == IndexType.NEVER);
switch (indexType) {
case NONE:
case NEVER:
break;
case INCREMENTAL:
dynamicTable.add(new HeaderField(name, value));
break;
default:
throw new IllegalStateException("should not reach here");
}
}