objectAPI := api.ObjectAPI()
	if objectAPI == nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	vars := mux.Vars(r)
	bucket := vars["bucket"]
	object, err := unescapePath(vars["object"])
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// Check for auth type to return S3 compatible error.

Stellen wir uns vor, Sie verfügen über einige **Modelle für maschinelles Lernen**, die Sie zur Bearbeitung von Requests verwenden möchten. 🤖

Die gleichen Modelle werden von den Requests gemeinsam genutzt, es handelt sich also nicht um ein Modell pro Request, pro Benutzer, oder ähnliches.

///

/// توجه | جزئیات فنی

شما همچنین می‌توانید از `from starlette.requests import Request` استفاده کنید.

package clause_test

import (
	"fmt"
	"testing"

	"gorm.io/gorm/clause"
)

func TestReturning(t *testing.T) {
	results := []struct {
		Clauses []clause.Interface
		Result  string
		Vars    []interface{}
	}{
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Returning{
				[]clause.Column{clause.PrimaryColumn},
			}},
			"SELECT * FROM `users` RETURNING `users`.`id`", nil,
		}, {

	stmt := dryRunDB.Create(&user).Statement
	if stmt.SQL.String() == "" || len(stmt.Vars) != 9 {
		t.Errorf("Failed to generate sql, got %v", stmt.SQL.String())
	}

	stmt2 := dryRunDB.Find(&user, "id = ?", user.ID).Statement
	if stmt2.SQL.String() == "" || len(stmt2.Vars) != 1 {
		t.Errorf("Failed to generate sql, got %v", stmt2.SQL.String())
	}
}

type ageInt int8

# Middleware Avanzado

En el tutorial principal leíste cómo agregar [Middleware Personalizado](../tutorial/middleware.md){.internal-link target=_blank} a tu aplicación.

Y luego también leíste cómo manejar [CORS con el `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

En esta sección veremos cómo usar otros middlewares.

## Agregando middlewares ASGI

			Queries("cors", "")
		// PutBucketCors - this is a dummy call.
		router.Methods(http.MethodPut).
			HandlerFunc(s3APIMiddleware(api.PutBucketCorsHandler)).
			Queries("cors", "")
		// DeleteBucketCors - this is a dummy call.
		router.Methods(http.MethodDelete).
			HandlerFunc(s3APIMiddleware(api.DeleteBucketCorsHandler)).
			Queries("cors", "")
		// GetBucketWebsiteHandler - this is a dummy call.

package clause_test

import (
	"fmt"
	"sort"
	"strings"
	"testing"

	"gorm.io/gorm/clause"
)

func TestSet(t *testing.T) {
	results := []struct {
		Clauses []clause.Interface
		Result  string
		Vars    []interface{}
	}{
		{
			[]clause.Interface{
				clause.Update{},
				clause.Set([]clause.Assignment{{clause.PrimaryColumn, 1}}),
			},
			"UPDATE `users` SET `users`.`id`=?",
			[]interface{}{1},
		},

type CheckConstraint struct {
	Name       string
	Constraint string // length(phone) >= 10
	*Field
}

func (chk *CheckConstraint) GetName() string { return chk.Name }

func (chk *CheckConstraint) Build() (sql string, vars []interface{}) {
	return "CONSTRAINT ? CHECK (?)", []interface{}{clause.Column{Name: chk.Name}, clause.Expr{SQL: chk.Constraint}}
}

// ParseCheckConstraints parse schema check constraints

			db.Statement.Dest, db.Error = db.Statement.ConnPool.QueryContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
		} else {
			db.Statement.Dest = db.Statement.ConnPool.QueryRowContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
		}

		db.RowsAffected = -1
	}