public String getConfig() {
        return this.config;
    }
Returns the actual INI configuration text to use to build the {@link SecurityManager} and
{@link FilterChainResolver} used by the web application or {@code null} if the
{@link #getConfigPath() configPath} should be used to load a fallback INI source.
<p/>
This value is {@code null} by default, but it will be automatically set to the value of the
'{@code config}' {@code init-param} if it exists in the {@code FilterConfig} provided by the servlet
container at startup.

@return the actual INI configuration text to use to build the {@link SecurityManager} and
{@link FilterChainResolver} used by the web application or {@code null} if the
{@link #getConfigPath() configPath} should be used to load a fallback INI source.
web/src/main/java/org/apache/shiro/web/servlet/IniShiroFilter.java