How to get the HTTP method in AWS Lambda?

Question

In an AWS Lambda code, how can I get the HTTP method (e.g. GET, POST...) of an HTTP request coming from the AWS Gateway API?

I understand from the documentation tha

Answer 1

I had this problem when I created a template microservice-http-endpoint-python project from functions. Since it creates an HTTP API Gateway, and only REST APIs have Mapping template I was not able to put this work. Only changing the code of Lambda.

Basically, the code does the same, but I am not using the event['httpMethod']

Please check this:

import boto3
import json

print('Loading function')
dynamo = boto3.client('dynamodb')


def respond(err, res=None):
    return {
        'statusCode': '400' if err else '200',
        'body': err.message if err else json.dumps(res),
        'headers': {
            'Content-Type': 'application/json',
        },
    }


def lambda_handler(event, context):
    '''Demonstrates a simple HTTP endpoint using API Gateway. You have full
    access to the request and response payload, including headers and
    status code.

    To scan a DynamoDB table, make a GET request with the TableName as a
    query string parameter. To put, update, or delete an item, make a POST,
    PUT, or DELETE request respectively, passing in the payload to the
    DynamoDB API as a JSON body.
    '''
    print("Received event: " + json.dumps(event, indent=2))

    operations = {
        'DELETE': lambda dynamo, x: dynamo.delete_item(**x),
        'GET': lambda dynamo, x: dynamo.scan(**x),
        'POST': lambda dynamo, x: dynamo.put_item(**x),
        'PUT': lambda dynamo, x: dynamo.update_item(**x),
    }
    
    operation =  event['requestContext']['http']['method']

    if operation in operations:
        payload = event['queryStringParameters'] if operation == 'GET' else json.loads(event['body'])
        return respond(None, operations[operation](dynamo, payload))
    else:
        return respond(ValueError('Unsupported method "{}"'.format(operation)))

I changed the code from:

operation = event['httpMethod']

to

operation = event['requestContext']['http']['method']

How do I get this solution?

I simply returned the entire event, checked the JSON and put it to work with the correct format.