How I can use 4 different http_methods in the same lambda function?

I have this function with which I intend to handle instances of ec2, with get I list all the instances in the region, post to create a new instance, put to modify one and delete to delete one instance, I'm using Python 3.9 lambda and serverless

import json
import boto3
def ec2_crud(event, context):
http_method = event['httpMethod']
try:
# Crear una conexión con EC2 usando la región en la que se encuentra la función Lambda
region = context.invoked_function_arn.split(":")[3]
ec2 = boto3.resource('ec2', region_name=region)
if http_method == 'GET':
# Obtener todas las instancias de EC2 en la región
instances = ec2.instances.all()
instance_list = []
for instance in instances:
instance_info = {
'InstanceId': instance.id,
'InstanceType': instance.instance_type,
'State': instance.state['Name']
}
instance_list.append(instance_info)
return {
'statusCode': 200,
'body': json.dumps(instance_list)
}
elif http_method == 'POST':
try:
request_data = json.loads(event['body'])
instance_name = request_data['name']
instance_size = request_data['size']
instance_keys = request_data['keys']
ec2_client = boto3.client('ec2')
new_instance = ec2_client.run_instances(
ImageId='ami-03f65b8614a860c29',  # Reemplaza con la AMI que desees usar
InstanceType=instance_size,
KeyName=instance_keys,
MinCount=1,
MaxCount=1
)['Instances'][0]
ec2_client.create_tags(Resources=[new_instance['InstanceId']], Tags=[{'Key': 'Name', 'Value': instance_name}])
return {
'statusCode': 200,
'body': json.dumps({'message': 'Nueva instancia creada con éxito.', 'InstanceId': new_instance['InstanceId']})
}
except Exception as e:
return {
'statusCode': 500,
'body': json.dumps({'error': str(e)})
}
elif http_method == 'PUT':
# Implementar la lógica para actualizar una instancia de EC2
instance_id = event['pathParameters']['instance_id']
instance_size = json.loads(event['body'])['size']
instance_name = json.loads(event['body'])['name']
# Crear una conexión con el servicio EC2
ec2_client = boto3.client('ec2')
try:
# Actualizar el tamaño y el nombre de la instancia
ec2_client.modify_instance_attribute(InstanceId=instance_id, Attribute='instanceType', Value=instance_size)
ec2_client.create_tags(Resources=[instance_id], Tags=[{'Key': 'Name', 'Value': instance_name}])
return {
'statusCode': 200,
'body': json.dumps({'message': f'Instancia {instance_id} actualizada con éxito.'})
}
except Exception as e:
return {
'statusCode': 500,
'body': json.dumps({'error': str(e)})
}
elif http_method == 'DELETE':
# Implementar la lógica para eliminar una instancia de EC2
instance_id = event['pathParameters']['instance_id']
# Crear una conexión con el servicio EC2
ec2_client = boto3.client('ec2')
try:
# Eliminar la instancia
ec2_client.terminate_instances(InstanceIds=[instance_id])
return {
'statusCode': 200,
'body': json.dumps({'message': f'Instancia {instance_id} eliminada con éxito.'})
}
except Exception as e:
return {
'statusCode': 500,
'body': json.dumps({'error': str(e)})
}
else:
return {
'statusCode': 400,
'body': json.dumps({'error': 'Método HTTP inválido.'})
}
except Exception as e:
return {
'statusCode': 500,
'body': json.dumps({'error': str(e)})
}

When I test get and post block with curl works well and runs the task but when I try it with put and delete, I get this error:

> Missing Authentication Token

and I don't know why this happens.

I try it to modify and delete ec2 instances

We'd need to see your serverless.yml file to check HTTP option configuration.

Typically, you'll see missing authentication token when the route exists but the HTTP method is not valid for that route.

You'll likely want to set method: ANY, like this example:

functions:
  myFunction:
    handler: index.handler
    events:
      - httpApi:
          path: /my-path
          method: ANY

If you also wanted any path from that API Gateway instance to route to your function, you can use the proxy configuration:

functions:
  myFunction:
    handler: index.handler
    events:
      - httpApi:
          path: ANY {proxy+}
          method: ANY