We create an `HTTPException` that we can reuse (`raise`) later at several points.

In this exception, we include the scopes required (if any) as a string separated by spaces (using `scope_str`). We put that string containing the scopes in the `WWW-Authenticate` header (this is part of the spec).

       * shouldn't change now for fear of breaking people.)
       *
       * If the entry is still in the map, then updateIndex ensured that `index` points to the right
       * element. Because that element is present, uncheckedCastNullableTToT is safe.
       */
      return (index == ABSENT) ? unsafeNull() : uncheckedCastNullableTToT(values[index]);
    }

 * of the code may not be readable by older versions of the code (e.g., a serialized Bloom filter
 * generated today may <i>not</i> be readable by a binary that was compiled 6 months ago).
 *
 * <p>As of Guava 23.0, this class is thread-safe and lock-free. It internally uses atomics and
 * compare-and-swap to ensure correctness when multiple threads are used to access it.
 *

        do {
          entryIndex = next - 1;
          entry = entries[entryIndex];
          next = CompactHashing.getNext(entry, mask);
        } while (next != srcNext);
        // here, entries[entryIndex] points to the old entry location; update it
        entries[entryIndex] = CompactHashing.maskCombine(entry, dstIndex + 1, mask);
      }
    } else {
      keys[dstIndex] = null;
      values[dstIndex] = null;

///

* If the PR can be simplified in a way, you can ask for that, but there's no need to be too picky, there might be a lot of subjective points of view (and I will have my own as well 🙈), so it's better if you can focus on the fundamental things.

### Tests { #tests }

* Help me check that the PR has **tests**.

        }

        DfsReferralDataInternal dr = null;
        final long now = System.currentTimeMillis();
        synchronized (this.domainsLock) {
            /*
             * domains that can contain DFS points to maps of roots for each
             */
            final Map<String, Map<String, CacheEntry<DfsReferralDataInternal>>> domains = getTrustedDomains(tf);
            if (domains != null) {

   * methods ensure that the {@code WrappedCollection} and map remain consistent.
   *
   * <p>A subcollection, such as a sublist, contains some of the values for a given key. Its
   * ancestor field points to the full wrapped collection with all values for the key. The
   * subcollection {@code refreshIfEmpty}, {@code removeIfEmpty}, and {@code addToMap} methods call
   * the corresponding methods of the full wrapped collection.

* **Machine Learning**: normalmente requiere muchas multiplicaciones de "matrices" y "vectores". Piensa en una enorme hoja de cálculo con números y multiplicando todos juntos al mismo tiempo.

        }

        if (logger.isDebugEnabled()) {
            logger.debug("metadata: {}", metadata);
        }

        return metadata;
    }

    // workaround: Tika does not have extention points.
    /**
     * This class is a parser that detects the document type.
     */
    protected class TikaDetectParser extends CompositeParser {
        private static final long serialVersionUID = 1L;

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