ord
<tt>{FCGI_END_REQUEST, R, ...}</tt> to the Web server.<p>

While a request ID <tt>R</tt> is inactive, the application ignores
records with <tt>requestId == R</tt>, except for <tt>FCGI_BEGIN_REQUEST</tt>
records as just described.<p>

The Web server attempts to keep FastCGI request IDs small.  That way
the application can keep track of request ID states using a short
array rather than a long array or a hash table.  An application
also has the option of accepting only one request at a time.
In this case t