{* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}

* `description: Union[str, None] = None` (or `str | None = None` in Python 3.10) has a default of `None`.
* `tax: float = 10.5` has a default of `10.5`.
* `tags: List[str] = []` has a default of an empty list: `[]`.

but you might want to omit them from the result if they were not actually stored.

        byte[] buffer = new byte[100];
        buffer[0] = 1; // replaceIfExists = true
        // Skip 7 reserved bytes (1-7)
        // Skip 8 bytes for RootDirectory (8-15)
        SMBUtil.writeInt4(nameBytes.length, buffer, 16);
        System.arraycopy(nameBytes, 0, buffer, 20, nameBytes.length);

        FileRenameInformation2 info = new FileRenameInformation2();

    "price": 3,
    "description": None,
}
```

because it doesn't include the already stored attribute `"tax": 20.2`, the input model would take the default value of `"tax": 10.5`.

And the data would be saved with that "new" `tax` of `10.5`.

## Partial updates with `PATCH` { #partial-updates-with-patch }

    //      last modified: 105 seconds ago
    //             served:   5 seconds ago
    //   default lifetime: (105 - 5) / 10 = 10 seconds
    //            expires:  10 seconds from served date = 5 seconds from now
    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("Last-Modified: " + formatDate(-105, TimeUnit.SECONDS))

If there's no `gzip` in the header, it will not try to decompress the body.

That way, the same route class can handle gzip compressed or uncompressed requests.

{* ../../docs_src/custom_request_and_route/tutorial001.py hl[8:15] *}

### Create a custom `GzipRoute` class { #create-a-custom-gziproute-class }

Next, we create a custom subclass of `fastapi.routing.APIRoute` that will make use of the `GzipRequest`.

    // overlap above
    assertEquals(Range.closed(6, 8), range.intersection(Range.closed(6, 10)));

    // adjacent above
    assertEquals(Range.openClosed(8, 8), range.intersection(Range.openClosed(8, 10)));

    // separate above
    expected =
        assertThrows(
            IllegalArgumentException.class, () -> range.intersection(Range.closed(10, 12)));

        FileSystemInformation info1 = response.getInfo();

        // Second read with different data
        buffer = prepareAllocationInfoBuffer();
        buffer[8] = 10; // Change some data

        int bytesRead2 = response.readDataWireFormat(buffer, 0, 20);
        FileSystemInformation info2 = response.getInfo();

        // Info should be updated

     * means: 3 entries, ban <code>org.foo group</code> (exactly, so <code>org.foo.bar</code> is allowed),
     * relocate <code>org.here</code> to <code>org.there</code> and finally globally relocate (see <code>&gt;&gt;</code> above)
     * <code>javax.inject:javax.inject:1</code> to <code>jakarta.inject:jakarta.inject:1.0.5</code>.
     *
     * @since 4.0.0
     */

        request.setSmbCreateFlags(flags);

        byte[] buffer = new byte[1024];
        request.writeBytesWireFormat(buffer, 0);

        // Verify flags are written at correct offset (8-15)
        long readFlags = 0;
        for (int i = 0; i < 8; i++) {
            readFlags |= ((long) (buffer[8 + i] & 0xFF)) << (i * 8);
        }
        assertEquals(flags, readFlags);
    }

    @Test

    // overlap above
    assertEquals(Range.closed(6, 8), range.intersection(Range.closed(6, 10)));

    // adjacent above
    assertEquals(Range.openClosed(8, 8), range.intersection(Range.openClosed(8, 10)));

    // separate above
    expected =
        assertThrows(
            IllegalArgumentException.class, () -> range.intersection(Range.closed(10, 12)));