I am creating an AWS ApiGateway & it invoking a lambda function asynchronously. Once apigateway sent the message lambda it'll send a 200 response with empty response. I need to send some static information with in the response message.
{
"code":"SUCCESS",
"description":"Successfully sent to lambda"
}
I tried to set up a model. But there I'm unable to set static values. Please help on this ?
You need to configure AWS API Gateway Integration Response Data Mapping return the response message from your Lambda function. If you use Lambda proxy, you can directly send the entire response including headers.
Note: If its only a static response, you don't need Lambda, you can use a Mock Endpoint with static message response.
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I have an aws lambda function written in node. I have a HTTP API in API Gateway which calls this lambda function.
The "issue" that I'm having is that my request payload which is a JSON, is sent wrapped in a raw body along with a bunch of other fields which I don't really need in my lambda.
How can I have the HTTP API to only send my payload?
If I use a REST API, at least by default, it works the way I expect.
I created a webhook in AWS with the API Gateway and Lambda function. It all works but one silly thing... When I POST to the webhook, where do I access the payload? Also, how to I redirect he payload to a local folder or S3 bucket?
The event parameter (the first parameter) sent to the Lambda function will have an API Gateway Proxy event. One of the fields in that event is the body, which will be the payload (encoded to a string).
You can make an S3 API call to put the body of the payload in S3. Alternatively, you could have the data go directly to S3 by using a pre-signed url.
I am trying to pass query string through my WebSocket connections by wss://connection_url?queryparam=param
but the lambda function invoked by the connection is not able to read the query param. in fact I printed the integration response received to lambda function and it doesn't show any query param in it. should I need to configure in API gateway to allow query string params please help
Yes, enable Use Lambda Proxy integration. See https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html
Im assuming lambda is like the missing piece of the puzzle for a complete api request. So you create the apigateway and then write the lambda function which bridges the gap between taking a request and returning the output of the lambda function as the http response.
I've successfully followed guides on how to set up an API gateway that triggers AWS lambda to do something, but I still don't really understand what is being done.
How is the function def handler(event, context): being called by the aws apigateway? How does it get triggered and how is the output of handler sent back?
You do not need a Lambda "in the middle". Using Lambda Proxy integration in the API Gateway you can receive the full information about the request (endpoint URL, query parameters, etc) in your targeted Lambda event.
Have a look at the following Tutorial how to setup Lambda Proxy integration with API Gateway.
The tricky thing you should care about is the structure of the response that you will return from your lambda_handler. See the requirements here.
Answering the question of "how this happens"... In short, when an HTTP request comes to your API endpoint it is automatically routed to the mapped Lambda function. Behind the scenes a new container for the Function is spawned and your request comes to the event of the lambda_handler. API Gateway by default also creates a CloudFront distribution in front of itself to serve your requests more efficiently. Once your Lambda returns the response, API Gateway parses it and constructs the HTTP response out of it. The nice thing is that all of this is managed by AWS.
I have a API gateway connected to SQS service, currently it just forward all the incoming requests bodies to SQS by SendMessage action.
I hope at integration request step I can check if the request has a certain field. If so, return a custom response and do not call the SQS service, otherwise forward the request body to SQS as I am doing right now.
I can do this by using a lambda function triggered by API gateway but i am wondering if I can do this without using lambda.
You may achieve that by setting up a request validator on AWS Api Gateway as explained here