message NonResourceAttributes {
  // Path is the URL path of the request
  // +optional
  optional string path = 1;

  // Verb is the standard HTTP verb
  // +optional
  optional string verb = 2;
}

// NonResourceRule holds information that describes a rule for the non-resource
message NonResourceRule {

   * `route` is the resolved route for a connection.
   */
  internal fun isEligible(
    address: Address,
    routes: List<Route>?,
  ): Boolean {
    lock.assertHeld()

    // If this connection is not accepting new exchanges, we're done.
    if (calls.size >= allocationLimit || noNewExchanges) return false

  rules:
  - apiGroups:
    - metallb.io
    apiVersions:
    - v1beta2
    operations:
    - CREATE
    - UPDATE
    resources:
    - bgppeers
  sideEffects: None
- admissionReviewVersions:
  - v1
  clientConfig:
    service:
      name: webhook-service
      namespace: metallb-system
      path: /validate-metallb-io-v1beta1-bfdprofile
  failurePolicy: Fail

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector objectSelector = 11;

  // SideEffects states whether this webhook has side effects.
  // Acceptable values are: Unknown, None, Some, NoneOnDryRun
  // Webhooks with side effects MUST implement a reconciliation system, since a request may be
  // rejected by a future step in the admission chain and the side effects therefore need to be undone.

message NonResourceAttributes {
  // Path is the URL path of the request
  // +optional
  optional string path = 1;

  // Verb is the standard HTTP verb
  // +optional
  optional string verb = 2;
}

// NonResourceRule holds information that describes a rule for the non-resource
message NonResourceRule {

    }

    @Override
    public CharMatcher negate() {
      return none();
    }
  }

  /** Implementation of {@link #none()}. */
  private static final class None extends NamedFastMatcher {

    static final CharMatcher INSTANCE = new None();

    private None() {
      super("CharMatcher.none()");
    }

    @Override
    public boolean matches(char c) {

  }

  /**
   * Sets the delegate of `timeout` to [Timeout.NONE] and resets its underlying timeout
   * to the default configuration. Use this to avoid unexpected sharing of timeouts between pooled
   * connections.
   */
  private fun detachTimeout(timeout: ForwardingTimeout) {
    val oldDelegate = timeout.delegate
    timeout.setDelegate(Timeout.NONE)
    oldDelegate.clearDeadline()
    oldDelegate.clearTimeout()
  }

```
INFO: Sending request http://www.publicobject.com/helloworld.txt on Connection{www.publicobject.com:80, proxy=DIRECT hostAddress=54.187.32.157 cipherSuite=none protocol=http/1.1}
User-Agent: OkHttp Example
Host: www.publicobject.com
Connection: Keep-Alive
Accept-Encoding: gzip

INFO: Received response for http://www.publicobject.com/helloworld.txt in 115.6ms

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):

Het tweede argument van <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> is de standaardwaarde die wordt geretourneerd.

Als je dit niet meegeeft, is de standaardwaarde `None`. In dit geval gebruiken we standaard `"World"`.

///

Dan zou je dat Python-programma kunnen aanroepen:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console