Testing with Postman

I was curious to see what the before and after would be with the plugin activated and deactived and I get the following msg both times. What is a faultCode. I entered the information correctly.

<methodResponse>
<fault>
<value>
<struct>
<member>
<name>faultCode</name>
<value>
<int>0</int>
</value>
</member>
<member>
<name>faultString</name>
<value>
<string />
</value>
</member>
</struct>
</value>
</fault>
</methodResponse>

https://wordpress.org/plugins/remove-xmlrpc-pingback-ping/