every item inside and make sure it is serializable as JSON, using the same [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank} explained in the tutorial. This is what allows you to return **arbitrary objects**, for example database models.

But if you are certain that the content that you are returning is **serializable with JSON**, you can pass it directly to the response class and avoid the extra overhead that FastAPI would have by passing your return content through...

 - [Confluence/Jira](https://github.com/codelibs/fess-ds-atlassian)
 - [Box](https://github.com/codelibs/fess-ds-box)
 - [CSV](https://github.com/codelibs/fess-ds-csv)
 - [Database](https://github.com/codelibs/fess-ds-db)
 - [Dropbox](https://github.com/codelibs/fess-ds-dropbox)
 - [Elasticsearch](https://github.com/codelibs/fess-ds-elasticsearch)
 - [Git](https://github.com/codelibs/fess-ds-git)

pkg crypto/x509, method (InsecureAlgorithmError) Error() string
pkg crypto/x509, method (SignatureAlgorithm) String() string
pkg crypto/x509, type InsecureAlgorithmError int
pkg database/sql, method (*DB) SetConnMaxLifetime(time.Duration)
pkg debug/dwarf, const ClassUnknown = 0
pkg debug/dwarf, const ClassUnknown Class
pkg debug/elf, const COMPRESS_HIOS = 1879048191

pkg database/sql, type NullFloat64 struct, Valid bool
pkg database/sql, type NullInt64 struct
pkg database/sql, type NullInt64 struct, Int64 int64
pkg database/sql, type NullInt64 struct, Valid bool
pkg database/sql, type NullString struct
pkg database/sql, type NullString struct, String string
pkg database/sql, type NullString struct, Valid bool
pkg database/sql, type RawBytes []uint8

        // We might no longer need some connections
        connectionPool.scheduleCloser()
      }
    }
  }

  override fun handshake(): Handshake? = handshake

  /** Track a bad route in the route database. Other routes will be attempted first. */
  internal fun connectFailed(
    client: OkHttpClient,
    failedRoute: Route,
    failure: IOException,
  ) {

pkg crypto/x509, type Certificate struct, MaxPathLenZero bool

# CL 158950043 database/sql: add Drivers, returning list of registered drivers, Russ Cox <******@****.***>
pkg database/sql, func Drivers() []string

# CL 117280043 debug/dwarf: fix Reader panic on DW_TAG_unspecified_type, Derek Parker <******@****.***>

    * Chuyển đổi kiểu dữ liệu Python (`str`, `int`, `float`, `bool`, `list`,...).
    * `datetime` objects.
    * `UUID` objects.
    * Database models.
    * ...và nhiều hơn thế.
* Tự động tạo tài liệu tương tác API, bao gồm 2 giao diện người dùng:
    * Swagger UI.
    * ReDoc.

---

Quay trở lại ví dụ trước, **FastAPI** sẽ thực hiện:

pkg crypto/x509, type Certificate struct, UnhandledCriticalExtensions []asn1.ObjectIdentifier
pkg crypto/x509/pkix, type Name struct, ExtraNames []AttributeTypeAndValue
pkg database/sql, method (*DB) Stats() DBStats
pkg database/sql, type DBStats struct
pkg database/sql, type DBStats struct, OpenConnections int
pkg debug/dwarf, const ClassAddress = 1
pkg debug/dwarf, const ClassAddress Class
pkg debug/dwarf, const ClassBlock = 2

		t.Fatalf("Should find saved record")
	}
}

func TestTransactionOnClosedConn(t *testing.T) {
	DB, err := OpenTestConnection(&gorm.Config{})
	if err != nil {
		t.Fatalf("failed to connect database, got error %v", err)
	}
	rawDB, _ := DB.DB()
	rawDB.Close()

	if err := DB.Transaction(func(tx *gorm.DB) error {
		return nil
	}); err == nil {

 *  Fix: Don't crash if the thread is interrupted while reading the public
    suffix database.
 *  Fix: Use relative resource path when loading the public suffix database.
    Loading the resource using a path relative to the class prevents conflicts
    when the OkHttp classes are relocated (shaded) by allowing multiple private
    copies of the database.
 *  Fix: Accept cookies for URLs that have an IPv6 address for a host.