public void setConfig(String config) {
        this.config = config;
    }
Sets the actual INI configuration text to use to build the {@link SecurityManager} and
{@link FilterChainResolver} used by the web application.  If this value is {@code null}, the
{@link #getConfigPath() configPath} will be checked to see if a .ini file should be loaded instead.
<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.

@param config the actual INI configuration text to use to build the {@link SecurityManager} and
              {@link FilterChainResolver} used by the web application.
web/src/main/java/org/apache/shiro/web/servlet/IniShiroFilter.java