code: public CdnPathBuilder blur(int strength) {
          if (strength < 0 || strength > 5000) {
              strength = 10;
          }
          sb.append("/-/blur/")
                  .append(strength);
          return this;
      }
docs: Performs Gaussian blur on result image.
  
  @param strength Strength is standard deviation (aka blur radius) multiplied by ten. Strength
  can be up to 5000. Default is 10.