s3 := append(s2, s0...)            // append a slice              s3 is []int{0, 0, 2, 3, 5, 7, 0, 0}
s4 := append(s3[3:6], s3[2:]...)   // append overlapping slice    s4 is []int{3, 5, 7, 2, 3, 5, 7, 0, 0}

var t []interface{}
t = append(t, 42, 3.1415, "foo")   //                             t is []interface{}{42, 3.1415, "foo"}

var b []byte

      return "[]";
    }
    StringBuilder builder = new StringBuilder(length() * 5); // rough estimate is fine
    builder.append('[').append(array[start]);

    for (int i = start + 1; i < end; i++) {
      builder.append(", ").append(array[i]);
    }
    builder.append(']');
    return builder.toString();
  }

  /**

      return "[]";
    }
    StringBuilder builder = new StringBuilder(length() * 5); // rough estimate is fine
    builder.append('[').append(array[start]);

    for (int i = start + 1; i < end; i++) {
      builder.append(", ").append(array[i]);
    }
    builder.append(']');
    return builder.toString();
  }

  /**

}

func TestSplit(t *testing.T) {
	for _, tt := range splittests {
		a := SplitN([]byte(tt.s), []byte(tt.sep), tt.n)

		// Appending to the results should not change future results.
		var x []byte
		for _, v := range a {
			x = append(v, 'z')
		}

		result := sliceOfString(a)
		if !slices.Equal(result, tt.a) {
			t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)

func (d *Digest) AppendBinary(b []byte) ([]byte, error) { switch d.dsbyte { case dsbyteSHA3: b = append(b, magicSHA3...) case dsbyteShake: b = append(b, magicShake...) case dsbyteCShake: b = append(b, magicCShake...) case dsbyteKeccak: b = append(b, magicKeccak...) default: panic("unknown dsbyte") } // rate is at most 168, and n is at most rate. b = append(b, byte(d.rate)) b = append(b, d.a[:]...) b = append(b, byte(d.n), byte(d.state)) return b, nil } func (d *Digest) UnmarshalBinary(b []byte) error...

    result[0] = element;
    arraycopy(array, 0, result, 1, array.length);
    return result;
  }

  /**
   * Returns a new array that appends {@code element} to {@code array}.
   *
   * @param array the array of elements to prepend
   * @param element the element to append to the end
   * @return an array whose size is one larger than {@code array}, with the same contents as {@code

    result[0] = element;
    arraycopy(array, 0, result, 1, array.length);
    return result;
  }

  /**
   * Returns a new array that appends {@code element} to {@code array}.
   *
   * @param array the array of elements to prepend
   * @param element the element to append to the end
   * @return an array whose size is one larger than {@code array}, with the same contents as {@code

        return line;
    }

    /**
     * Append parsed arguments as quoted strings to the result builder.
     */
    private static void appendQuotedArguments(StringBuilder result, List<String> args) {
        for (String arg : args) {
            if (result.length() > 0) {
                result.append(' ');
            }
            result.append('"').append(arg).append('"');
        }
    }

    /**

                        textBuilder.append(headers[i]).append(headerValueSeparator).append(row[i]).append(fieldSeparator);
                    }
                }
                textBuilder.append(lineSeparator);
            } else {
                // No headers, just concatenate values
                textBuilder.append(String.join(fieldSeparator, row)).append(lineSeparator);
            }
        }

* `media_type` - A `str` giving the media type. E.g. `"text/html"`.

FastAPI (actually Starlette) will automatically include a Content-Length header. It will also include a Content-Type header, based on the `media_type` and appending a charset for text types.

{* ../../docs_src/response_directly/tutorial002_py39.py hl[1,18] *}

### `HTMLResponse` { #htmlresponse }

Takes some text or bytes and returns an HTML response, as you read above.