This makes it easy to generate up-to-date **documentation**, client libraries (<abbr title="Software Development Kits">**SDKs**</abbr>) in multiple languages, and **testing** or **automation workflows** that stay in sync with your code.

In this guide, you'll learn how to generate a **TypeScript SDK** for your FastAPI backend.

## Open Source SDK Generators { #open-source-sdk-generators }

 * your OkHttp library can break connectivity to certain web servers! But it’s a necessary annoyance
 * because the TLS ecosystem is dynamic and staying up to date is necessary to stay secure. See
 * [OkHttp's TLS Configuration History][tls_history] to track these changes.
 *
 * [tls_history]: https://square.github.io/okhttp/tls_configuration_history/
 */
class ConnectionSpec internal constructor(

        assertTrue(keyManager.hasSessionKey(sessionId + ".v2"), "Version 2 should exist");

        // Remove main key
        keyManager.removeSessionKey(sessionId);

        // Verify main key is removed (archives stay)
        assertFalse(keyManager.hasSessionKey(sessionId), "Main key should be removed");
        // Note: Archives are not automatically removed when removing main key
    }

* There should be tests testing the source example.
* Before the PR is applied, the new tests should fail.
* After applying the PR, the new tests should pass.
* Coverage should stay at 100%.
* If you see the PR makes sense, or we discussed it and considered it should be accepted, you can add commits on top of the PR to tweak it, to add docs, tests, format, refactor, remove extra files, etc.

```Python hl_lines="14-17" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

That way, the original `APIRouter` will stay unmodified, so we can still share that same `app/internal/admin.py` file with other projects in the organization.

The result is that in our app, each of the *path operations* from the `admin` module will have:

And there are several ways to get help too.

## Subscribe to the newsletter { #subscribe-to-the-newsletter }

You can subscribe to the (infrequent) [**FastAPI and friends** newsletter](newsletter.md){.internal-link target=_blank} to stay updated about:

* News about FastAPI and friends 🚀
* Guides 📝
* Features ✨
* Breaking changes 🚨
* Tips and tricks ✅

## Follow FastAPI on X (Twitter) { #follow-fastapi-on-x-twitter }

            final ByteBuffer buffer = ByteBuffer.wrap(nonce);
            buffer.order(java.nio.ByteOrder.LITTLE_ENDIAN);
            buffer.putLong(counter);
            // Remaining bytes (if any) stay zero-padded
        }

        return nonce;
    }

    /**
     * Generate a secure random nonce for initial session setup.
     * This method can be used when enhanced randomness is required,

many lessons to learn!  No, I've made up my mind about it; if I'm
Mabel, I'll stay down here!  It'll be no use their putting their
heads down and saying "Come up again, dear!"  I shall only look
up and say "Who am I then?  Tell me that first, and then, if I
like being that person, I'll come up:  if not, I'll stay down
here till I'm somebody else"--but, oh dear!' cried Alice, with a

   * com.google.common.io.ByteStreams#newDataOutput()} to get a growable buffer.
   */
  public static byte[] toByteArray(long value) {
    // Note that this code needs to stay compatible with GWT, which has known
    // bugs when narrowing byte casts of long values occur.
    byte[] result = new byte[8];
    for (int i = 7; i >= 0; i--) {
      result[i] = (byte) (value & 0xffL);

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