@Override
    public String toString() {
        return getCacheKey() + '\n' + headers.toString();
    }
Returns an inexpensive to calculate {@link String} suitable for use as a disk cache key.

<p> This method does not include headers. </p>

<p> Unlike {@link #toStringUrl()}} and {@link #toURL()}, this method does not escape input. </p>
core/src/main/java/com/bumptech/glide/load/model/GlideUrl.java