You stand in line while several (let's say 8) cashiers that at the same time are cooks take the orders from the people in front of you.

Everyone before you is waiting for their burgers to be ready before leaving the counter because each of the 8 cashiers goes and prepares the burger right away before getting the next order.

<img src="/img/async/parallel-burgers/parallel-burgers-01.png" class="illustration">

    if (cacheCandidate != null && cacheResponse == null) {
      // The cache candidate wasn't applicable. Close it.
      cacheCandidate.body.closeQuietly()
    }

    // If we're forbidden from using the network and the cache is insufficient, fail.
    if (networkRequest == null && cacheResponse == null) {
      return Response.Builder()
        .request(chain.request())
        .protocol(Protocol.HTTP_1_1)

  }

  companion object {
    /**
     * Cache control request directives that require network validation of responses. Note that such
     * requests may be assisted by the cache via conditional GET requests.
     */
    @JvmField
    val FORCE_NETWORK = commonForceNetwork()

    /**
     * Cache control request directives that uses the cache only, even if the cached response is

  * If you work for a company that wants to allow you to contribute your work, then you'll need to sign a [corporate CLA](https://code.google.com/legal/corporate-cla-v1.0.html).

Follow either of the two links above to access the appropriate CLA and instructions for how to sign and return it. Once we receive it, we'll be able to accept your pull requests.

## Main **FastAPI** app

And now in the file `sql_app/main.py` let's integrate and use all the other parts we created before.

### Create the database tables

In a very simplistic way create the database tables:

```Python hl_lines="9-11"

}

// StatefulSet represents a set of pods with consistent identities.
// Identities are defined as:
//   - Network: A single stable DNS and hostname.
//   - Storage: As many VolumeClaims as requested.
//
// The StatefulSet guarantees that a given network identity will always
// map to the same storage identity.
message StatefulSet {
  // Standard object's metadata.

  // Both these may change in the future.
  // Incoming requests are matched against the host before the
  // IngressRuleValue. If the host is unspecified, the Ingress routes all
  // traffic based on the specified IngressRuleValue.
  //
  // Host can be "precise" which is a domain name without the terminating dot of
  // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name

  }

  @Test
  fun networkInterceptorsRewriteRequestToServer() {
    rewriteRequestToServer(true)
  }

  private fun rewriteRequestToServer(network: Boolean) {
    server.enqueue(MockResponse())
    addInterceptor(network) { chain: Interceptor.Chain ->
      val originalRequest = chain.request()
      chain.proceed(
        originalRequest.newBuilder()

      debugData = source.readByteString(opaqueDataLength.toLong())
    }
    handler.goAway(lastStreamId, errorCode, debugData)
  }

  /** Unlike other `readXxx()` functions, this one must log the frame before returning. */
  @Throws(IOException::class)
  private fun readWindowUpdate(
    handler: Handler,
    length: Int,
    flags: Int,
    streamId: Int,
  ) {
    val increment: Long
    try {

```Python hl_lines="2  7"
{!../../../docs_src/custom_response/tutorial001b.py!}
```

!!! info