```Python hl_lines="35"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

/// tip

Notice that you are not passing the router itself (`invoices_callback_router`) to `callback=`, but the attribute `.routes`, as in `invoices_callback_router.routes`.

///

### Check the docs

    /**
     * Returns true if (current * radix) + digit is a number too large to be represented by an
     * unsigned long. This is useful for detecting overflow while parsing a string representation of
     * a number. Does not verify whether supplied radix is valid, passing an invalid radix will give
     * undefined results or an ArrayIndexOutOfBoundsException.
     */
    static boolean overflowInParse(long current, int digit, int radix) {

    return collection.stream();
  }

  /**
   * Returns a sequential {@link Stream} of the remaining contents of {@code iterator}. Do not use
   * {@code iterator} directly after passing it to this method.
   */
  public static <T extends @Nullable Object> Stream<T> stream(Iterator<T> iterator) {
    return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0), false);
  }

  /**

#   re-running tests. However, note that:
#
#    - New environments like new CUDA versions, changes to manylinux,
#      compilers, etc. can cause undefined behavior such as build failures
#      or tests passing incorrectly.
#    - Automatic LLVM updates are known to extend build time even with
#      the cache; this is unavoidable.
export TFCI=py311,linux_x86,public_cache,disk_cache

# Recommended: Configure Docker. (Linux only)

	}
	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
		t.Errorf("ModTime = %v; want %v", g, e)
	}
	// FileInfoHeader should error when passing nil FileInfo
	if _, err := FileInfoHeader(nil, ""); err == nil {
		t.Fatalf("Expected error when passing nil to FileInfoHeader")
	}
}

func TestFileInfoHeaderDir(t *testing.T) {
	fi, err := os.Stat("testdata")
	if err != nil {
		t.Fatal(err)
	}

  }

  /**
   * Performs {@link NullPointerTester} checks for all top-level classes in the package. For a class
   * {@code C}
   *
   * <ul>
   *   <li>All visible static methods are checked such that passing null for any parameter that's
   *       not annotated nullable (according to the rules of {@link NullPointerTester}) should throw
   *       {@link NullPointerException}.

            Doc(
                """
                The OAuth2 spec says it is required and MUST be the fixed string
                "password". Nevertheless, this dependency class is permissive and
                allows not passing it. If you want to enforce it, use instead the
                `OAuth2PasswordRequestFormStrict` dependency.
                """
            ),
        ] = None,
        username: Annotated[
            str,

   * elements.
   *
   * <p>To cycle over the elements {@code n} times, use the following: {@code
   * Iterables.concat(Collections.nCopies(n, Arrays.asList(elements)))}
   *
   * <p><b>Java 8+ users:</b> If passing a single element {@code e}, the {@code Stream} equivalent
   * of this method is {@code Stream.generate(() -> e)}. Otherwise, put the elements in a collection

// The recycler should handle nil pointers.
type Recycler interface {
	Recycle()
}

// MSS is a map[string]string that can be serialized.
// It is not very efficient, but it is only used for easy parameter passing.
type MSS map[string]string

// Get returns the value for the given key.
func (m *MSS) Get(key string) string {
	if m == nil {
		return ""
	}
	return (*m)[key]
}

// Set a key, value pair.

		return nil
	}

	config.RLock()
	defer config.RUnlock()

	var tierCfgs []madmin.TierConfig
	for _, tier := range config.Tiers {
		// This makes a local copy of tier config before
		// passing a reference to it.
		tier := tier.Clone()
		tierCfgs = append(tierCfgs, tier)
	}
	return tierCfgs
}

// Edit replaces the credentials of the remote tier specified by tierName with creds.