Practical Debugging Techniques

Retrieval of features:

feature_get -i 1 -n encoding

response:

<response command="feature_get" transaction_id="1"
    feature_name="encoding" supported="1">
  <![CDATA[UTF-8]]></response>

Setting features:

feature_set -i 2 -n show_hidden -v 1

response:

<reponse command="feature_set" transaction_id="2"
    feature="show_hidden" success="1"></response>

Features include:

language_name [RO], supports_async [RO], max_children, max_data, max_depth [RO], show_hidden and supports_postmortem [RO].