This is necessary for bookkeeping when creating new streams. Correct framing requires that stream IDs are sequential on the socket, so we need to bundle assigning the ID with sending the `SYN_STREAM` frame.

## Connection Pool

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.duplicatehost;

import org.codelibs.fess.app.web.admin.duplicatehost.CreateForm;

/**
 * Request body for creating duplicate host via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.fileauth;

import org.codelibs.fess.app.web.admin.fileauth.CreateForm;

/**
 * Request body for creating file authentication via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.pathmap;

import org.codelibs.fess.app.web.admin.pathmap.CreateForm;

/**
 * Request body for creating path mapping via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.user;

import org.codelibs.fess.app.web.admin.user.CreateForm;

/**
 * Request body for creating user via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.webauth;

import org.codelibs.fess.app.web.admin.webauth.CreateForm;

/**
 * Request body for creating web authentication via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.badword;

import org.codelibs.fess.app.web.admin.badword.CreateForm;

/**
 * Request body for creating bad word via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.reqheader;

import org.codelibs.fess.app.web.admin.reqheader.CreateForm;

/**
 * Request body for creating request header via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.dict.protwords;

import org.codelibs.fess.app.web.admin.dict.protwords.CreateForm;

/**
 * Request body for creating protected words dictionary via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    /**
     * Creates a new CreateBody instance.
     */

## An app with callbacks { #an-app-with-callbacks }

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

These invoices will have an `id`, `title` (optional), `customer`, and `total`.

The user of your API (an external developer) will create an invoice in your API with a POST request.