wro4j-core/src/main/java/ro/isdc/wro/model/resource/processor/impl/css/AbstractCssImportPreProcessor.java
private String computeAbsoluteUrl(final String relativeResourceUri, final String importUrl) {
    final String folder = WroUtil.getFullPath(relativeResourceUri);
    // remove '../' & normalize the path.
    return StringUtils.cleanPath(folder + importUrl);
  }
private String computeAbsoluteUrl(final String relativeResourceUri, final String importUrl) {
    final String folder = WroUtil.getFullPath(relativeResourceUri);
    // remove '../' & normalize the path.
    return StringUtils.cleanPath(folder + importUrl);
  }
Computes absolute url of the imported resource.

@param relativeResourceUri uri of the resource containing the import statement.
@param importUrl found import url.
@return absolute url of the resource to import.