## Other middlewares

There are many other ASGI middlewares.

For example:

* <a href="https://github.com/encode/uvicorn/blob/master/uvicorn/middleware/proxy_headers.py" class="external-link" target="_blank">Uvicorn's `ProxyHeadersMiddleware`</a>

    if (bubbledTo == vacated) {
      // Could not bubble toTrickle up min levels, try moving
      // it from min level to max level (or max to min level) and bubble up
      // there.
      return heap.tryCrossOverAndBubbleUp(index, vacated, toTrickle);
    } else {
      return (bubbledTo < index) ? new MoveDesc<E>(toTrickle, elementData(index)) : null;
    }
  }

    could use new flow control capacity before acknowledging it, causing strict HTTP/2 servers to
    fail the call.

 *  Fix: Recover gracefully when a coalesced connection immediately goes unhealthy.

## Version 3.14.2

_2019-05-19_

 *  Fix: Lock in a route when recovering from an HTTP/2 connection error. We had a bug where two

	if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
		return nil, nil, err // EOF is okay here; exactly 0 bytes read
	}
	if bytes.Equal(tr.blk[:], zeroBlock[:]) {
		if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
			return nil, nil, err // EOF is okay here; exactly 1 block of zeros read
		}
		if bytes.Equal(tr.blk[:], zeroBlock[:]) {

	}
	if !f.Tag.IsEmpty() {
		if err := f.Tag.Validate(); err != nil {
			return err
		}
	}
	return nil
}

// TestTags tests if the object tags satisfy the Filter tags requirement,
// it returns true if there is no tags in the underlying Filter.
func (f *Filter) TestTags(userTags string) bool {
	if f.cachedTags == nil {
		cached := make(map[string]string)
		for _, t := range append(f.And.Tags, f.Tag) {
			if !t.IsEmpty() {

type MutatingWebhookConfigInfo struct {
	Name     string `json:"name"`
	Revision string `json:"revision"`
	Tag      string `json:"tag,omitempty"`
}

// NsInfo represents namespace related information like pods running there.
// It is used to display data and is exposed for integration tests.
type NsInfo struct {
	Name string             `json:"name,omitempty"`
	Pods []*PodFilteredInfo `json:"pods,omitempty"`
}

        assertEscaping(xmlEscaper, "\uFFFD", ch);
      }
    }

    // Test _all_ allowed characters (including surrogate values).
    for (char ch = 0x20; ch <= 0xFFFD; ch++) {
      // There are a small number of cases to consider, so just do it manually.
      if (ch == '&') {
        assertEscaping(xmlEscaper, "&amp;", ch);
      } else if (ch == '<') {
        assertEscaping(xmlEscaper, "&lt;", ch);

      // Some Android 5.0.x Samsung devices have bugs in JDK reflection APIs that cause
      // getDeclaredField to throw a NoSuchFieldException when the field is definitely there.
      // For these users fallback to a suboptimal implementation, based on synchronized. This will
      // be a definite performance hit to those users.
      thrownReflectionFailure = reflectionFailure;

 * invoke methods, they invoke methods on the {@code ForwardingSortedSet}.
 *
 * <p>Each of the {@code standard} methods, where appropriate, uses the set's comparator (or the
 * natural ordering of the elements, if there is no comparator) to test element equality. As a
 * result, if the comparator is not consistent with equals, some of the standard implementations may
 * violate the {@code Set} contract.

		result = multierror.Append(result, client.AdmissionregistrationV1().MutatingWebhookConfigurations().Delete(ctx, wh.Name, metav1.DeleteOptions{})).ErrorOrNil()
	}
	return result
}

// PreviousInstallExists checks whether there is an existing Istio installation. Should be used in installer when deciding
// whether to make an installation the default.
func PreviousInstallExists(ctx context.Context, client kubernetes.Interface) bool {