code: public StaticResourceRequestMatcher at(Set<StaticResourceLocation> locations) {
  		Assert.notNull(locations, "Locations must not be null");
  		return new StaticResourceRequestMatcher(new LinkedHashSet<>(locations));
  	}
docs: Returns a matcher that includes the specified {@link StaticResourceLocation
  Locations}. For example: <pre class="code">
  PathRequest.toStaticResources().at(locations)
  </pre>
  @param locations the locations to include
  @return the configured {@link RequestMatcher}