AWS Lambda HTTP POST Request (Node.js)

问题:

I'm relatively new to AWS lambda function and nodejs. I'm working on to try and get the list of 5 cities in a country by using HTTP POST request from this website: "http://www.webservicex.net/globalweather.asmx?op=GetCitiesByCountry"

I've been searching about how to do a HTTP POST request in lambda function but I can't seem to find a good explanation for it.

Searches that I found for http post:

https://www.npmjs.com/package/http-post How to make an HTTP POST request in node.js?

回答1:

Try the following sample, invoking HTTP GET or POST request in nodejs from AWS lambda

const options = {
        hostname: 'hostname',
        port: port number,
        path: urlpath,
        method: 'method type'
    };

const req = https.request(options, (res) => {
    res.setEncoding('utf8');
    res.on('data', (chunk) => {
      // code to execute
    });
    res.on('end', () => {
      // code to execute      
    });
});
req.on('error', (e) => {
    callback(null, "Error has occured");
});
req.end();

Consider the sample

回答2:

I had difficulty implementing the other answers so I'm posting what worked for me.

In this case the function receives url, path and post data

Lambda function

var querystring = require('querystring');
var http = require('http');

exports.handler = function (event, context) {
var post_data = querystring.stringify(
      event.body
  );

  // An object of options to indicate where to post to
  var post_options = {
      host: event.url,
      port: '80',
      path: event.path,
      method: 'POST',
      headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': Buffer.byteLength(post_data)
      }
  };

  // Set up the request
  var post_req = http.request(post_options, function(res) {
      res.setEncoding('utf8');
      res.on('data', function (chunk) {
          console.log('Response: ' + chunk);
          context.succeed();
      });
      res.on('error', function (e) {
        console.log("Got error: " + e.message);
        context.done(null, 'FAILURE');
      });

  });

  // post the data
  post_req.write(post_data);
  post_req.end();

}

Example of call parameters

   {
      "url": "example.com",      
       "path": "/apifunction",
       "body": { "data": "your data"}  <-- here your object
    }

回答3:

Use HTTP object and use POST as the request type. HTTP requests in AWS Lambda are no different from HTTP requests using NodeJS.

Let me know if you need any more help.