val groupLength = i - groupOffset
    if (groupLength == 0) return false // No digits.

    // We've successfully read a byte.
    address[b++] = value.toByte()
  }

  // Check for too few groups. We wanted exactly four.
  return b == addressOffset + 4
}

/** Encodes an IPv6 address in canonical form according to RFC 5952. */
internal fun inet6AddressToAscii(address: ByteArray): String {

	var zb0001 uint32
	zb0001, err = dc.ReadArrayHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	if zb0001 != 18 {
		err = msgp.ArrayError{Wanted: 18, Got: zb0001}
		return
	}
	z.Total, err = dc.ReadUint64()
	if err != nil {
		err = msgp.WrapError(err, "Total")
		return
	}
	z.Free, err = dc.ReadUint64()
	if err != nil {

---

"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"

This decoupling of parts, and being a "microframework" that could be extended to cover exactly what is needed was a key feature that I wanted to keep.

Given the simplicity of Flask, it seemed like a good match for building APIs. The next thing to find was a "Django REST Framework" for Flask.

/// check | Inspired **FastAPI** to

  volatile @Nullable Waiter waitersField;

  /** Non-volatile write of the thread to the {@link Waiter#thread} field. */
  private static void putThread(Waiter waiter, Thread newValue) {
    ATOMIC_HELPER.putThread(waiter, newValue);
  }

  /** Non-volatile write of the waiter to the {@link Waiter#next} field. */
  private static void putNext(Waiter waiter, @Nullable Waiter newValue) {

  volatile @Nullable Waiter waitersField;

  /** Non-volatile write of the thread to the {@link Waiter#thread} field. */
  private static void putThread(Waiter waiter, Thread newValue) {
    ATOMIC_HELPER.putThread(waiter, newValue);
  }

  /** Non-volatile write of the waiter to the {@link Waiter#next} field. */
  private static void putNext(Waiter waiter, @Nullable Waiter newValue) {

		for i, want := range keys {
			if want.CreatedBy != kms.StubCreatedBy {
				t.Fatalf("want key created by %s, got %s", kms.StubCreatedBy, want.CreatedBy)
			}
			if want.CreatedAt != kms.StubCreatedAt {
				t.Fatalf("want key created at %s, got %s", kms.StubCreatedAt, want.CreatedAt)
			}
			if test.wantKeyNames[i] != want.Name {
				t.Fatalf("want key name %s, got %s", test.wantKeyNames[i], want.Name)
			}
		}
	}

---

"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"

			var zb0002 uint32
			zb0002, err = dc.ReadArrayHeader()
			if err != nil {
				err = msgp.WrapError(err, "Totals")
				return
			}
			if zb0002 != uint32(60) {
				err = msgp.ArrayError{Wanted: uint32(60), Got: zb0002}
				return
			}
			for za0001 := range z.Totals {
				err = z.Totals[za0001].DecodeMsg(dc)
				if err != nil {
					err = msgp.WrapError(err, "Totals", za0001)
					return

You can check it at <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a>:

<img src="/img/tutorial/behind-a-proxy/image02.png">

Right as we wanted it. ✔️

This is because FastAPI uses this `root_path` to create the default `server` in OpenAPI with the URL provided by `root_path`.

## Additional servers { #additional-servers }

/// warning