# Header Parameter Models { #header-parameter-models }

If you have a group of related **header parameters**, you can create a **Pydantic model** to declare them.

This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎

/// note

This is supported since FastAPI version `0.115.0`. 🤓

///

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.lifecycle;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.maven.execution.MavenSession;

import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.maven.model.Build;
import org.apache.maven.model.Model;
import org.apache.maven.model.Reporting;
import org.apache.maven.model.Resource;

/**
 * DefaultPathTranslator
 */
@Deprecated
@Named
@Singleton

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.lifecycle.internal;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.util.List;
import java.util.Map;

import org.apache.maven.execution.ExecutionEvent;
import org.apache.maven.execution.MavenExecutionResult;

# Cookie Parameter Models { #cookie-parameter-models }

If you have a group of **cookies** that are related, you can create a **Pydantic model** to declare them. 🍪

This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎

/// note

This is supported since FastAPI version `0.115.0`. 🤓

///

/// tip

import org.apache.maven.api.annotations.Nullable;
import org.apache.maven.api.cache.RequestCacheFactory;
import org.apache.maven.api.cli.extensions.CoreExtension;
import org.apache.maven.api.di.Inject;
import org.apache.maven.api.di.Named;
import org.apache.maven.api.model.Plugin;
import org.apache.maven.api.services.ArtifactCoordinatesFactory;
import org.apache.maven.api.services.ArtifactManager;
import org.apache.maven.api.services.ArtifactResolver;

            @Named(GraphBuilder.HINT) GraphBuilder graphBuilder,
            BuildResumptionAnalyzer buildResumptionAnalyzer,
            BuildResumptionDataRepository buildResumptionDataRepository,
            SuperPomProvider superPomProvider,
            DefaultSessionFactory defaultSessionFactory,
            @Nullable @Named("ide") WorkspaceReader ideWorkspaceReader) {

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.profile.activation;

import javax.inject.Named;
import javax.inject.Singleton;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.maven.model.Activation;

{* ../../docs_src/custom_request_and_route/tutorial001_an_py310.py hl[19:27] *}

/// note | Technical Details

A `Request` has a `request.scope` attribute, that's just a Python `dict` containing the metadata related to the request.

A `Request` also has a `request.receive`, that's a function to "receive" the body of the request.

The `scope` `dict` and `receive` function are both part of the ASGI specification.

   - Document testing steps in the PR summary if manual testing was performed.

4. **Before Submitting**:
   - Run `make verify` to check formatting, linting, and tests.
   - Reference related issues (e.g., “Closes #1234”).
   - Notify team members via GitHub `@mentions` if urgent or complex.

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