/// info

This requires installing `ujson` for example with `pip install ujson`.

///

/// warning

`ujson` is less careful than Python's built-in implementation in how it handles some edge-cases.

///

```Python hl_lines="2  7"
{!../../docs_src/custom_response/tutorial001.py!}
```

/// tip

The OpenAPI schema is what powers the two interactive documentation systems included.

And there are dozens of alternatives, all based on OpenAPI. You could easily add any of those alternatives to your application built with **FastAPI**.

You could also use it to generate code automatically, for clients that communicate with your API. For example, frontend, mobile or IoT applications.

## Recap, step by step

- Kubernetes is now built with Golang 1.17.4 ([#106833](https://github.com/kubernetes/kubernetes/pull/106833), [@cpanato](https://github.com/cpanato))
- Kubernetes is now built with Golang 1.17.5. ([#106956](https://github.com/kubernetes/kubernetes/pull/106956), [@cpanato](https://github.com/cpanato))

- Kubernetes is now built with Golang 1.16.7. ([#104199](https://github.com/kubernetes/kubernetes/pull/104199), [@cpanato](https://github.com/cpanato))
- Kubernetes is now built with Golang 1.17.1. ([#104904](https://github.com/kubernetes/kubernetes/pull/104904), [@cpanato](https://github.com/cpanato))

      this.comparator = checkNotNull(comparator);
    }

    /**
     * Associates {@code key} with {@code value} in the built map. Duplicate keys, according to the
     * comparator (which might be the keys' natural order), are not allowed, and will cause {@link
     * #build} to fail.
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> put(K key, V value) {
      super.put(key, value);

`PushContext` is an immutable snapshot of the current state of the world. It is regenerated (usually partially) on each configuration push (more on this below). Due to being a snapshot, most lookups are lock-free.

import java.net.ProtocolException
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.Date
import java.util.TimeZone
import kotlin.reflect.KClass
import okio.ByteString

/**
 * Built-in adapters for reading standard ASN.1 types.
 */
internal object Adapters {
  val BOOLEAN =
    BasicDerAdapter(
      name = "BOOLEAN",
      tagClass = DerHeader.TAG_CLASS_UNIVERSAL,
      tag = 1L,

@GwtIncompatible
@ElementTypesAreNonnullByDefault
public class FinalizableReferenceQueue implements Closeable {
  /*
   * The Finalizer thread keeps a phantom reference to this object. When the client (for example, a
   * map built by MapMaker) no longer has a strong reference to this object, the garbage collector
   * will reclaim it and enqueue the phantom reference. The enqueued reference will trigger the
   * Finalizer to stop.
   *

        this.values = Arrays.copyOf(values, newCapacity);
      }
    }

    /**
     * Associates {@code key} with {@code value} in the built map. Duplicate keys, according to the
     * comparator (which might be the keys' natural order), are not allowed, and will cause {@link
     * #build} to fail.
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> put(K key, V value) {
      ensureCapacity(size + 1);

   * per call to submit() or submitAsync(), and each instance supports only one call to execute().
   *
   * <p>This class would certainly be simpler and easier to reason about if it were built with
   * ThreadLocal; however, ThreadLocal is not well optimized for the case where the ThreadLocal is
   * non-static, and is initialized/removed frequently - this causes churn in the Thread specific