As code duplication increments the chances of bugs, security issues, code desynchronization issues (when you update in one place but not in the others), etc.

And these models are all sharing a lot of the data and duplicating attribute names and types.

We could do better.

We can declare a `UserBase` model that serves as a base for our other models. And then we can make subclasses of that model that inherit its attributes (type declarations, validation, etc).

    /**
     * Gets the default field for this query context.
     * @return The default field name, or null if not set.
     */
    public String getDefaultField() {
        return defaultField;
    }

    /**
     * Sets the default field for this query context.
     * @param defaultField The default field name to set.
     */
    public void setDefaultField(final String defaultField) {

     *
     * @return an {@link Optional} containing the project name to resume from, or empty if not specified
     */
    @Nonnull
    Optional<String> resumeFrom();

    /**
     * Returns the list of specified reactor projects to build instead of all projects.
     *
     * @return an {@link Optional} containing the list of project names to build, or empty if not specified
     */
    @Nonnull

This would mean that **FastAPI** would expect a body similar to:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

Again, doing just that declaration, with **FastAPI** you get:

 * limitations under the License.
 */
package okhttp3

import java.net.InetAddress
import java.net.UnknownHostException
import okhttp3.Dns.Companion.SYSTEM

/**
 * A domain name service that resolves IP addresses for host names. Most applications will use the
 * [system DNS service][SYSTEM], which is the default. Some applications may provide their own

      "x01234567890123456789012345678901234567890123456789012345678901x",
      "x01234567890123456789012345678901234567890123456789012345678901†",
      // OkHttp rejects domain names longer than 253 code points, the web platform tests don't.

    // Simple FileEntry stub for tests
    private static final class FE implements FileEntry {
        private final String name;

        FE(String name) {
            this.name = name;
        }

        @Override
        public String getName() {
            return name;
        }

        @Override
        public int getType() {
            return 0;
        }

        @Override

	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	// This only checks if the action (kms:ListKeys) is allowed, it does not check
	// each key name against the policy's Resources. We check that below, once
	// we have the list of key names from the KMS.
	objectAPI, _ := validateAdminReq(ctx, w, r, policy.KMSListKeysAction)
	if objectAPI == nil {
		return
	}

	if GlobalKMS == nil {

```
$ adb shell setprop log.tag.okhttp.Http2 DEBUG
$ adb shell setprop log.tag.okhttp.TaskRunner DEBUG
$ adb logcat '*:E' 'okhttp.Http2:D' 'okhttp.TaskRunner:D'
```

### HTTP/2 Frame Logging

This logs inbound (`<<`) and outbound (`>>`) frames for HTTP/2 connections.

```
[2020-01-01 00:00:00] >> CONNECTION 505249202a20485454502f322e300d0a0d0a534d0d0a0d0a
[2020-01-01 00:00:00] >> 0x00000000     6 SETTINGS

    int FLAGS_LOCK_AND_READ_WRITE_AND_UNLOCK = 0x01;
    /** Receive buffer posted flag */
    int FLAGS_RECEIVE_BUFFER_POSTED = 0x02;
    /** Path names are caseless flag */
    int FLAGS_PATH_NAMES_CASELESS = 0x08;
    /** Path names canonicalized flag */
    int FLAGS_PATH_NAMES_CANONICALIZED = 0x10;
    /** Oplock requested or granted flag */
    int FLAGS_OPLOCK_REQUESTED_OR_GRANTED = 0x20;