@Controller
public class TestController {
    /**
     * Example mapping that accepts only GET requests made to the
     * fromGoogle path if the request referrer header contains
     * http://www.google.com.
     */
    @GetMapping("/fromGoogle")
    @ReferrerMapping("http://www.google.com")
    public String google() {
        ...
    }
}

/**
 * Custom mapping that will only match if any of the referrers are set.
 * If both type and method level annotation is present, the method level annotation
 * attributes will replace the type level attributes.  This is taken care of in the
 * combine() method of the ReferrerRequestCondition.
 */
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@CustomRequestMapping(ReferrerRequestCondition.class)
private @interface ReferrerMapping
{
    // possible header values - the mapping will apply if the request
    // referrer has any of these values
    String[] value();
}

/**
 * Condition implementation.  This will be instantiated as a bean,
 * so wiring other components is possible as well as long as they are
 * visible in the AcrossWebModule context.
 */
private static class ReferrerRequestCondition extends AbstractCustomRequestCondition<ReferrerRequestCondition>
{
    private String[] referrers = new String[0];

    // get the configured headers from the annotation
    @Override
    public void setAnnotatedElement( AnnotatedElement element ) {
        referrers = AnnotatedElementUtils.findMergedAnnotation( element, ReferrerMapping.class )
                                         .value();
    }

    @Override
    protected Collection<String> getContent() {
        return Arrays.asList( referrers );
    }

    @Override
    protected String getToStringInfix() {
        return " || ";
    }

    // no relevant combination - other simply replaces this one
    @Override
    public ReferrerRequestCondition combine( ReferrerRequestCondition other ) {
        return other;
    }

    // return self if headers matches, else there is no matching condition
    @Override
    public ReferrerRequestCondition getMatchingCondition( HttpServletRequest request ) {
        if ( StringUtils.containsAny( request.getHeader( HttpHeaders.REFERER ), referrers ) ) {
            return this;
        }
        return null;
    }

    // always consider them equal
    // there is no relevant ordering if headers are different
    @Override
    public int compareTo( ReferrerRequestCondition other, HttpServletRequest request ) {
        return 0;
    }
}