*         <li>UNSET, meaning "null pointer"
   *         <li>one plus an index into the entries and elements array
   *       </ul>
   *   <li>another java.util.Set delegate implementation. In most modern JDKs, normal java.util hash
   *       collections intelligently fall back to a binary search tree if hash table collisions are
   *       detected. Rather than going to all the trouble of reimplementing this ourselves, we

                            request.setPath(dunc);
                        }
                        return loc;
                    }

                    // fallthrough to normal handling
                    log.debug("No tree referral but in DFS");
                }
                else {
                    log.trace("Not in DFS");
                    return loc;
                }

    * The router dependencies are executed first, then the [`dependencies` in the decorator](dependencies/dependencies-in-path-operation-decorators.md){.internal-link target=_blank}, and then the normal parameter dependencies.
    * You can also add [`Security` dependencies with `scopes`](../advanced/security/oauth2-scopes.md){.internal-link target=_blank}.

/// tip

            path = "../";
        }
        out.println( ( dirCount + fileCount ) + " objects (" + dirCount + " directories, " + fileCount + " files)<br>");
        out.println("<b><a class=\"plain\" href=\".\">normal</a> | <a class=\"plain\" href=\"?fmt=detail\">detailed</a></b>");
        out.println("<p><table border='0' cellspacing='0' cellpadding='0'><tr><td>");

        out.print("<A style=\"width: " + maxLen);

```Python hl_lines="5-6"
{!../../docs_src/dependencies/tutorial007.py!}
```

/// tip

You can use `async` or regular functions.

**FastAPI** will do the right thing with each, the same as with normal dependencies.

///

## A dependency with `yield` and `try`

If you use a `try` block in a dependency with `yield`, you'll receive any exception that was thrown when using the dependency.

                    <mxGeometry x="895" y="640" width="300" height="100"...

                    <mxGeometry x="895" y="650" width="300" height="100"...

            path = "../";
        }
        out.println( (dirCount + fileCount) + " objects (" + dirCount + " directories, " + fileCount + " files)<br>" );
        out.println( "<b><a class=\"plain\" href=\".\">normal</a> | <a class=\"plain\" href=\"?fmt=detail\">detailed</a></b>" );
        out.println( "<p><table border='0' cellspacing='0' cellpadding='0'><tr><td>" );

        out.print( "<A style=\"width: " + maxLen );

  }

  @VisibleForTesting
  @WeakOuter
  final class ValueSet extends Sets.ImprovedAbstractSet<V> implements ValueSetLink<K, V> {
    /*
     * We currently use a fixed load factor of 1.0, a bit higher than normal to reduce memory
     * consumption.
     */

    @ParametricNullness private final K key;
    @VisibleForTesting @Nullable ValueEntry<K, V>[] hashTable;
    private int size = 0;
    private int modCount = 0;

                    setHttpHeaders.invoke(wagon, headers);
                } catch (NoSuchMethodException e) {
                    // normal for non-http wagons
                } catch (Exception e) {
                    logger.debug("Could not set user agent for wagon "
                            + wagon.getClass().getName() + ": " + e);
                }