Na verdade, todos (ou a maioria) dos frameworks web funcionam da mesma forma.

Você nunca chama essas funções diretamente. Elas são chamadas pelo framework utilizado (nesse caso, **FastAPI**).

    if (Build.VERSION.SDK_INT >= 30) {
      CloseGuard().apply { open(closer) }
    } else {
      super.getStackTraceForCloseable(closer)
    }

  override fun logCloseableLeak(
    message: String,
    stackTrace: Any?,
  ) {
    if (Build.VERSION.SDK_INT >= 30) {
      (stackTrace as CloseGuard).warnIfOpen()
    } else {
      // Unable to report via CloseGuard. As a last-ditch effort, send it to the logger.

	var versions []FileInfo
	var err error

	if buf, _, e := isIndexedMetaV2(xlMetaBuf); e != nil {
		return FileInfoVersions{}, e
	} else if buf != nil {
		versions, err = buf.ListVersions(volume, path, allParts)
	} else {
		var xlMeta xlMetaV2
		if err := xlMeta.LoadOrConvert(xlMetaBuf); err != nil {
			return FileInfoVersions{}, err
		}
		versions, err = xlMeta.ListVersions(volume, path, allParts)

					p.errorf("expected register; found %s", name)
				}
				a.Reg, _ = p.registerReference(name)
				p.get(')')
			}
		} else if p.atRegisterExtension() {
			a.Type = obj.TYPE_REG
			p.registerExtension(a, tok.String(), prefix)
			p.expectOperandEnd()
			return
		} else if r1, r2, scale, ok := p.register(tok.String(), prefix); ok {
			if scale != 0 {
				p.errorf("expected simple register reference")
			}

        int result = 13;

        if (lowerBound == null) {
            result += 1;
        } else {
            result += lowerBound.hashCode();
        }

        result *= lowerBoundInclusive ? 1 : 2;

        if (upperBound == null) {
            result -= 3;
        } else {
            result -= upperBound.hashCode();
        }

        result *= upperBoundInclusive ? 2 : 3;

    if not file:
        return {"message": "No file sent"}
    else:
        return {"file_size": len(file)}


@app.post("/uploadfile/")
async def create_upload_file(file: Union[UploadFile, None] = None):
    if not file:
        return {"message": "No upload file sent"}
    else:

    }

    private static boolean matches(String pattern, String str) {
        if (isAny(pattern)) {
            return true;
        } else if (pattern.endsWith("*")) {
            return str.startsWith(pattern.substring(0, pattern.length() - 1));
        } else {
            return Objects.equals(pattern, str);
        }
    }

    private static Predicate<Artifact> artifactPredicate(Artifact artifact) {

          return 0x100;
        } else if (userFriendly.matches("(?i)(?:Greek|Cyrillic|European|ISO.?8859)")) {
          // Mostly 2-byte UTF-8 sequences - "European" text
          return 0x800;
        } else if (userFriendly.matches("(?i)(?:Chinese|Han|Asian|BMP)")) {
          // Mostly 3-byte UTF-8 sequences - "Asian" text
          return Character.MIN_SUPPLEMENTARY_CODE_POINT;

              break
            } else {
              currentLabelIndex++
              currentLabelByteIndex = -1
              expectDot = true
            }
          }
        }

        if (compareResult < 0) {
          high = mid - 1
        } else if (compareResult > 0) {
          low = mid + end + 1
        } else {
          // We found a match, but are the lengths equal?

      return new byte[buckets];
    } else if (buckets <= SHORT_MAX_SIZE) {
      return new short[buckets];
    } else {
      return new int[buckets];
    }
  }

  static void tableClear(Object table) {
    if (table instanceof byte[]) {
      Arrays.fill((byte[]) table, (byte) 0);
    } else if (table instanceof short[]) {
      Arrays.fill((short[]) table, (short) 0);
    } else {
      Arrays.fill((int[]) table, 0);