Post request to AWS Lambda URL - amazon-web-services

Question

I have an AWS Lambda function that is meant to receive a json, pass it to a machine learning model and return a prediction.
The tests are working well, so now I want to configure a Function URL. My goal is to be able to post a request to the function's URL from my local computer and have it respond with a prediction.
For the purpose of this question, suppose the function looks as follows:
# Silly function
def lambda_handler(event, context):
# Extract values from request
x = list(event.values())
# Return
return {
'status': '200',
'inputs': x
}
Hence, the test event {"feature1": 12, "feature2": 34} responds with the expected result:
{
"status": "200",
"inputs": [
12,
34
]
}
I just configured a URL through:
Configuration > Create Function URL > Auth type = None > Save.
How can I post requests to this URL to get the same response as the test event?
In other words, can I send the same test event via Insomnia (or Postman) to the URL and get the same response as the test event?

Answer 1

After reading the docs, I realized that the information I wanted to extract was contained in the "body" element nested inside the event received by the function.
I had to adapt my function to extract the "body" from event.
# Function to load jsons passed as strings
from json import loads
# Silly function
def lambda_handler(event, context):
# Extract body from event
body = event['body']
# Extract values from body
x = list(body.values())
# Return
return {
'status': '200',
'inputs': x
}
I had to do this because event looks like this in the background.
{
"headers":{<headers here>},
"isBase64Encoded":false,
"rawPath":"\/",
"routeKey":"$default",
"requestContext":{<context here>},
"body":"{\"feature1\": 12,\n\t\"feature2\": 34}",
"version":"2.0",
"rawQueryString":""
}
My mistake came from thinking that {"feature1": 12, "feature2": 34} was contained directly inside event, when in reality, it was nested inside "body".