These are very technical details of how **FastAPI** works underneath.

If you have quite some technical knowledge (coroutines, threads, blocking, etc.) and are curious about how FastAPI handles `async def` vs normal `def`, go ahead.

///

### Path operation functions

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For example:

* <a href="https://code.visualstudio.com/docs/python/environments#_select-and-activate-an-environment" class="external-link" target="_blank">VS Code</a>
* <a href="https://www.jetbrains.com/help/pycharm/creating-virtual-environment.html" class="external-link" target="_blank">PyCharm</a>

/// tip

## 매우 세부적인 기술적 사항

/// warning | "경고"

이 부분은 넘어가도 됩니다.

이것들은 **FastAPI**가 내부적으로 어떻게 동작하는지에 대한 매우 세부적인 기술사항입니다.

만약 기술적 지식(코루틴, 스레드, 블록킹 등)이 있고 FastAPI가 어떻게 `async def` vs `def`를 다루는지 궁금하다면, 계속하십시오.

///

### 경로 작동 함수

경로 작동 함수를 `async def` 대신 일반적인 `def`로 선언하는 경우, (서버를 차단하는 것처럼) 그것을 직접 호출하는 대신 대기중인 외부 스레드풀에서 실행됩니다.

      write_to_bazelrc('build --define=%s=%s' % (varname, environ_cp[varname]))


def set_windows_build_flags(environ_cp):
  """Set Windows specific build options."""

  # First available in VS 16.4. Speeds up Windows compile times by a lot. See
  # https://groups.google.com/a/tensorflow.org/d/topic/build/SsW98Eo7l3o/discussion
  # pylint: disable=line-too-long
  write_to_bazelrc(

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e<4?"\u0f58\u0f5a\u0f53\u0f0b\u0f58\u0f7c":e<10?"\u0f5e\u0f7c\u0f42\u0f66\u0f0b\u0f40\u0f66":e<17?"\u0f49\u0f72\u0f53\u0f0b\u0f42\u0f74\u0f44":e<20?"\u0f51\u0f42\u0f7c\u0f44\u0f0b\u0f51\u0f42":"\u0f58\u0f5a\u0f53\u0f0b\u0f58\u0f7c"},week:{dow:0,doy:6}});var vs=[/^gen/i,/^c[\u02bc\']hwe/i,/^meu/i,/^ebr/i,/^mae/i,/^(mez|eve)/i,/^gou/i,/^eos/i,/^gwe/i,/^her/i,/^du/i,/^ker/i],bs=/^(genver|c[\u02bc\']hwevrer|meurzh|ebrel|mae|mezheven|gouere|eost|gwengolo|here|du|kerzu|gen|c[\u02bc\']hwe|meu|ebr|mae|eve|gou|eo...

//
// Note that the specific integers used to identify the
// specific tagged classes can and will change from release
// to release (that's why this stuff is in CF*Internal*.h),
// as can the definition of type info vs payload above.
//
#if __LP64__
#define CF_IS_TAGGED_OBJ(PTR)	((uintptr_t)(PTR) & 0x1)
#define CF_TAGGED_OBJ_TYPE(PTR)	((uintptr_t)(PTR) & 0xF)
#else
#define CF_IS_TAGGED_OBJ(PTR)	0

	}
}

func errSRIAMConfigMismatch(peer1, peer2 string, s1, s2 madmin.IDPSettings) SRError {
	return SRError{
		Cause: fmt.Errorf("IAM/IDP settings mismatch between %s and %s: %#v vs %#v", peer1, peer2, s1, s2),
		Code:  ErrSiteReplicationIAMConfigMismatch,
	}
}

var errSRObjectLayerNotReady = SRError{
	Cause: fmt.Errorf("object layer not ready"),
	Code:  ErrServerNotInitialized,
}

":{"X-Minio-Internal-Server-Side-Encryption-Iv":"MLqMAmFg0M7JCvcIss4K/8I=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAOGaeDRYPNHZKSvv+OMMwoPLF2dwSQLGl3VZO/vs/i9ZTgMI8FB4X53lA==","X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key":"IAAfAKsbKGFE68ErOruY/OTd9/HVbA3JfleEDLinCCOh3f+Q==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"...