// the representable doubles are 2^54 and 2^54 + 4
    // 2^54+1 is less than halfway between, so HALF_DOWN and HALF_UP will both go down.
    new RoundToDoubleTester(BigDecimal.valueOf(1L << 54).add(new BigDecimal(0.5)))
        .setExpectation(twoToThe54, DOWN, FLOOR, HALF_DOWN, HALF_UP, HALF_EVEN)
        .setExpectation(Math.nextUp(twoToThe54), CEILING, UP)
        .roundUnnecessaryShouldThrow()
        .test();

	ADD $2280, R25, R11                        // 2ba32391
	ADD $(2280<<12), R25, R11                  // ADD $9338880, R25, R11            // 2ba36391
	ADDW R13->5, R11, R7                       // 67158d0b
	ADD R25<<54, R17, R16                      // 30da198b
	ADDSW R12.SXTX<<1, R29, R7                 // a7e72c2b
	ADDS R24.UXTX<<4, R25, R21                 // 357338ab

	_ = x[ErrBucketRemoteLabelInUse-50]
	_ = x[ErrBucketRemoteArnTypeInvalid-51]
	_ = x[ErrBucketRemoteArnInvalid-52]
	_ = x[ErrBucketRemoteRemoveDisallowed-53]
	_ = x[ErrRemoteTargetNotVersionedError-54]
	_ = x[ErrReplicationSourceNotVersionedError-55]
	_ = x[ErrReplicationNeedsVersioningError-56]
	_ = x[ErrReplicationBucketNeedsVersioningError-57]
	_ = x[ErrReplicationDenyEditError-58]
	_ = x[ErrRemoteTargetDenyAddError-59]

## 常规 **FastAPI** 应用

添加回调前，首先看下常规 API 应用是什么样子。

常规 API 应用包含接收 `Invoice` 请求体的*路径操作*，还有包含回调 URL 的查询参数 `callback_url`。

这部分代码很常规，您对绝大多数代码应该都比较熟悉了：

{* ../../docs_src/openapi_callbacks/tutorial001.py hl[10:14,37:54] *}

/// tip | 提示

`callback_url` 查询参数使用 Pydantic 的 <a href="https://pydantic-docs.helpmanual.io/usage/types/#urls" class="external-link" target="_blank">URL</a> 类型。

///

                    |                              |                   |  +---+---+
                    |                              |                   |      |
                    | 5     +----------------+     |4      +------+ 3a |      |
                    |<------| OEK_encrypted' |<----+-------| EK_2 |<---|------+
                    |       +----------------+             +------+    |      |

 * including dots after the first colon. It matches IPv4 addresses as strings containing only
 * decimal digits and dots. This pattern matches strings like "a:.23" and "54" that are neither IP
 * addresses nor hostnames; they will be verified as IP addresses (which is a more strict
 * verification).
 */
private val VERIFY_AS_IP_ADDRESS = "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)".toRegex()

              }
            ]
          }
        ]
      },
      "gridPos": {
        "h": 6,
        "w": 6,
        "x": 0,
        "y": 24
      },
      "id": 54,
      "options": {
        "legend": {
          "calcs": [],
          "displayMode": "list",
          "placement": "bottom",
          "showLegend": true
        },
        "tooltip": {

pkg debug/elf, const R_390_PLT64 = 25
pkg debug/elf, const R_390_PLT64 R_390
pkg debug/elf, const R_390_RELATIVE = 12
pkg debug/elf, const R_390_RELATIVE R_390
pkg debug/elf, const R_390_TLS_DTPMOD = 54
pkg debug/elf, const R_390_TLS_DTPMOD R_390
pkg debug/elf, const R_390_TLS_DTPOFF = 55
pkg debug/elf, const R_390_TLS_DTPOFF R_390
pkg debug/elf, const R_390_TLS_GD32 = 40
pkg debug/elf, const R_390_TLS_GD32 R_390

	github.com/gobwas/pool v0.2.1 // indirect
	github.com/goccy/go-json v0.10.5 // indirect
	github.com/gogo/protobuf v1.3.2 // indirect
	github.com/golang-jwt/jwt/v5 v5.2.2 // indirect
	github.com/golang/protobuf v1.5.4 // indirect
	github.com/golang/snappy v1.0.0 // indirect
	github.com/google/go-tpm v0.9.3 // indirect
	github.com/google/pprof v0.0.0-20250422154841-e1f9c1950416 // indirect
	github.com/google/s2a-go v0.1.9 // indirect

    bytesIn.writeUtf8("custom-value")
  }

  private fun checkReadThirdRequestWithoutHuffman() {
    assertThat(hpackReader!!.headerCount).isEqualTo(3)

    // [  1] (s =  54) custom-key: custom-value
    var entry = hpackReader!!.dynamicTable[readerHeaderTableLength() - 3]!!
    checkEntry(entry, "custom-key", "custom-value", 54)

    // [  2] (s =  53) cache-control: no-cache