AWS Lambda functions running Node.JS can make calls over the Internet to APIs and services using the https module included in Javascript.
For example, your function can define the following module:
var https = require('https');
You can make a POST call to a service such as:
https://cp6gckjt97.execute-api.us-east-1.amazonaws.com/prod/stateresource
Unlike an HTTPS GET, you cannot test a POST URL in your browser to see the web service in action. A POST service expects a specially formatted request message to be packaged and transmitted by your code to the service endpoint.
The configuration for your service should follow the pattern below:
var post_data = {"usstate": myData};
var post_options = {
host: 'cp6gckjt97.execute-api.us-east-1.amazonaws.com',
port: '443',
path: '/prod/stateresource',
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Content-Length': Buffer.byteLength(JSON.stringify(post_data))
}
};
Once the web service call has been setup, you can execute it by sending in your post_data object:
post_req.write(JSON.stringify(post_data));
post_req.end();
This particular service returns a JSON object. Your code will need to parse and process the response data from your web service.
Sample response:
{"Name":"New Jersey","population":9000000,"rank":11}
Read the full documentation on Node.JS https including how to add options to define x509 certificate keys, if required.
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