{!> ../../docs_src/header_param_models/tutorial002.py!}
```

////

Se um cliente tentar enviar alguns **cabeçalhos extra**, eles irão receber uma resposta de **erro**.

Por exemplo, se o cliente tentar enviar um cabeçalho `tool` com o valor `plumbus`, ele irá receber uma resposta de **erro** informando que o parâmetro do cabeçalho `tool` não é permitido:

```json
{
    "detail": [
        {

            """
                {
                    "acceptedApiChanges": [
                        {
                            "type": "org.gradle.api.tasks.AbstractExecTask",
                            "member": "Method org.gradle.api.tasks.AbstractExecTask.getExecResult()",
                            "acceptation": "Removed for Gradle 8.0",
                            "changes": [
                                "Method has been removed"

                        "member": "Implemented interface org.gradle.api.initialization.IncludedBuild",
                        "changes": ["Interface has been removed"],
                        "acceptation": "@Incubating interface has been removed"
                    },
                    {
                        "type": "other.Type",
                        "member": "Method other.Type.someMethod",

import groovy.transform.Immutable

@Immutable
class ApiChange {
    String type
    String member
    List<String> changes

    static ApiChange parse(Object json) {
        new ApiChange(json.type, json.member, json.changes ?: [])
    }

    String toString() {
        def formattedMember = member - "$type."
        "$type - $formattedMember - $changes"
    }

        val member: String?,
        val acceptation: String?,
        val changes: List<String>?
    ) {
        override fun toString(): String = "Type: '$type', Member: '$member'"
    }

    @VisibleForTesting
    data class AcceptedApiChanges(
        val acceptedApiChanges: List<AcceptedApiChange>?
    )

    @Override
    public Violation maybeViolation(final JApiCompatibility member) {
        if (member instanceof JApiMethod || member instanceof JApiField || member instanceof JApiClass) {
            if (!isIncubating((JApiHasAnnotations) member)) {
                return null;
            }
            if (member instanceof JApiMethod && isOverride((JApiMethod) member)) {
                return null;
            }

        }

    fun isSince(version: String, member: JApiCompatibility): Boolean =
        apiSourceFileFor(member).let { apiSourceFile ->
            when (apiSourceFile) {
                is ApiSourceFile.Java -> sources.executeQuery(apiSourceFile, JavaSourceQueries.isSince(version, member))
                is ApiSourceFile.Kotlin -> sources.executeQuery(apiSourceFile, KotlinSourceQueries.isSince(version, member))
            }
        }

    private

Do mesmo modo, você pode definir a lógica (código) que será executada quando a aplicação estiver sendo **encerrada**. Nesse caso, este código será executado **uma vez**, **depois** de ter possivelmente tratado **várias requisições**.

objectclass: groupofnames
cn: projectx
description: Project X group members
member: uid=alice1,ou=people,ou=hwengg,dc=min,dc=io
member: uid=bobfisher,ou=people,ou=hwengg,dc=min,dc=io

dn: cn=projecty,ou=groups,ou=hwengg,dc=min,dc=io
objectclass: groupofnames
cn: projecty
description: Project Y group members
member: uid=bobfisher,ou=people,ou=hwengg,dc=min,dc=io

    }

    Violation maybeViolation(final JApiCompatibility member) {
        if (!(member instanceof JApiClass)) {
            return null
        }

        if (!changed(member)) {
            return null
        }

        Optional<CtClass> oldClass = member.oldClass
        Optional<CtClass> newClass = member.newClass
        if (!oldClass.isPresent() || !newClass.isPresent()) {