How to get API gateway url in AWS lambda function?

Question

I have a scenario where I am using an API URL to invoke lambda function. After invoking the lambda function, I want that particular URL in the lambda function.

https://******.execute-api.eu-west-1.amazonaws.com/test/first

https://******.execute-api.eu-west-1.amazonaws.com/test/second

From this URL, I want the resource named first or second in lambda. Here the test is the stage name where I deplou\y my API. I have multiple resources created from that I want to change the behavior of lambda. How could I do this? Any help would be appreciated.

Tom · Accepted Answer · 2018-09-30 17:13:15Z

20

You can reconstruct the full url from values in the Lambda function's events variable.

events['headers']['Host'] = '******.execute-api.eu-west-1.amazonaws.com'
events['requestContext']['stage'] = 'test'
events['path'] = '/first'

So altogether, you can get https://******.execute-api.eu-west-1.amazonaws.com/test/first from adding them together:

'https://' + events['headers']['Host'] + '/' + events['requestContext']['stage'] + events['path']

See the Lambda Proxy integration part of the AWS documentation for details on other info you get can out of the events variable.

answered Sep 30, 2018 at 17:13

Tom

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