**FastAPI** knows what to do in each case and how to reuse the same object, so that all the background tasks are merged together and are run in the background afterwards:


{* ../../docs_src/background_tasks/tutorial002_an_py310.py hl[13,15,22,25] *}

    }

    // Because we happen to use the same formula. If that changes, just don't override this.
    @Override
    public int hashCode() {
      return parent.hashCode();
    }

    @Override
    public String toString() {
      return parent.toString();
    }
  }

  /**
   * Returns {@code true} if {@code object} is an {@code ImmutableLongArray} containing the same
   * values as this one, in the same order.

    }

    // Because we happen to use the same formula. If that changes, just don't override this.
    @Override
    public int hashCode() {
      return parent.hashCode();
    }

    @Override
    public String toString() {
      return parent.toString();
    }
  }

  /**
   * Returns {@code true} if {@code object} is an {@code ImmutableIntArray} containing the same
   * values as this one, in the same order.

        SmbComNTCreateAndX req = createRequest(0, 0);
        String str = req.toString();
        assertTrue(str.startsWith("SmbComNTCreateAndX["), "toString should start with class name");
        assertTrue(str.contains("name=test.txt"), "The file name should appear");
        // securityFlags are set to 0x03 – verify hex sequence
        assertTrue(str.contains("securityFlags=0x03"), "securityFlags should be present");
    }

    /**

   * this {@code Joiner} otherwise.
   *
   * @since 20.0
   */
  public MapJoiner withKeyValueSeparator(char keyValueSeparator) {
    return withKeyValueSeparator(String.valueOf(keyValueSeparator));
  }

  /**
   * Returns a {@code MapJoiner} using the given key-value separator, and the same configuration as
   * this {@code Joiner} otherwise.

	entries := []string{}
	for i := range 10 {
		name := fmt.Sprintf("file-%d", i)
		if err := os.WriteFile(filepath.Join(dir, name), []byte{}, os.ModePerm); err != nil {
			// For cleanup, its required to add these entries into test results.
			testResults = append(testResults, result{dir, entries})
			t.Fatalf("Unable to create file, %s", err)
		}
		entries = append(entries, name)
	}

	// Keep entries sorted for easier comparison.

    val sentHeaders = headerEntries("name", "value")
    val headerBytes = literalHeaders(sentHeaders)
    writeMedium(frame, headerBytes.size.toInt())
    frame.writeByte(Http2.TYPE_HEADERS)
    frame.writeByte(FLAG_END_HEADERS or FLAG_END_STREAM)
    frame.writeInt(expectedStreamId and 0x7fffffff)
    frame.writeAll(headerBytes)

    // Check writer sends the same bytes.

        CharMappingItem item4 = new CharMappingItem(4L, inputs1, "different");

        // Same inputs and output should have same hash code
        assertEquals(item1.hashCode(), item2.hashCode());

        // Different inputs should have different hash code
        assertNotSame(item1.hashCode(), item3.hashCode());

        // Same inputs but different output should have different hash code

        // Assert
        assertArrayEquals(h2, h1, "nTOWFv1 should return NT hash");
        assertEquals(16, h1.length, "NT hash length is 16 bytes");
    }

    @Test
    @DisplayName("nTOWFv2: overloads produce same result and domain affects key")
    void testNTOWFv2_overloadsAndDomainSensitivity() {
        // Arrange
        String domain = "Domain";
        String user = "User";
        String password = "password";

The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).