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post request python lambda

Narkw Brahma

Narkw Brahma

• 2 min read

Post Request in Python Lambda Function

If you are working with AWS Lambda Functions, you might need to make HTTP requests to external APIs. One of the most common HTTP requests is the POST request. In this blog post, I will explain how to make a POST request using Python in an AWS Lambda function.

Step 1: Create a Lambda Function

To create a new lambda function, you need to go to the AWS Management Console, click on the lambda service and click on the "Create Function" button. Choose "Author from scratch" and give your function a name, a runtime (Python in our case), and a role.

Step 2: Add a POST Request Handler

Now that we have created our lambda function, we need to add a handler for the POST request. To do this, we will use the built-in "requests" library in Python. Here is an example of what your handler function could look like:


import requests

def lambda_handler(event, context):
    url = 'https://api.example.com/create'
    data = {"name": "John", "age": 30}
    response = requests.post(url, json=data)
    return {'statusCode': response.status_code, 'body': response.text}
  • The "event" parameter contains information about the request that triggered the function.
  • The "context" parameter contains information about the runtime environment of the function.
  • The "url" variable contains the URL of the API endpoint that we want to send the POST request to.
  • The "data" variable contains a JSON object with the data that we want to send with the POST request.
  • The "response" variable contains the response object returned by the API endpoint.
  • The "statusCode" and "body" keys in the return statement are used to construct the HTTP response that will be sent back to the client.

Step 3: Deploy Your Lambda Function

Now that we have implemented our POST request handler, we need to deploy our lambda function. To do this, we need to click on the "Deploy" button in the AWS Management Console.

Alternative Way: Use Boto3 Library

If you prefer to use the AWS SDK for Python (Boto3), you can use the "botocore.vendored" module to import the "requests" library. Here is an example of what your handler function could look like:


import botocore.vendored.requests as requests

def lambda_handler(event, context):
    url = 'https://api.example.com/create'
    data = {"name": "John", "age": 30}
    response = requests.post(url, json=data)
    return {'statusCode': response.status_code, 'body': response.text}
  • The "botocore.vendored" module is included in the AWS Lambda environment and allows you to import external libraries.
  • The rest of the code is the same as in the previous example.
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