CODEWITHSUNDEEP
amazon-web-servicesflaskamazon-ec2
Jon Behnken
Jon Behnken

Reputation: 560

EC2 instance refusing connection to localhost from itself

I'm trying to get a Flask app to run on an EC2 instance. I have a few JS functions that send requests to the localhost in the backend to retrieve data from an API.

For instance:

if(topicQueryString != null && topicQueryString != ''){
      $.ajax({
          url: 'http://0.0.0.0:5000/search/t/'+topicQueryString,
          type: 'GET',
          dataType: 'json',
          success: function(data) { //do something }
        })
    }

However, when deploying the app on my EC2 instance, these requests fail with ERR_CONNECTION_REFUSED on localhost:5000/search/t/topics

Is there a way to allow the EC2 instance to make requests to itself in this way?

Upvotes: 1

Views: 1075

Answers (1)

Bruno Reis
Bruno Reis

Reputation: 37832

You're trying to connect to 0.0.0.0, not localhost. The address 0.0.0.0 doesn't mean localhost. You should replace that with localhost or 127.0.0.1 (which is what localhost means, most of the time).

EDIT: actually, I'm not even sure that I understood the problem correctly. Is that JS code running in a browser? You want that code to connect to a back-end service, presumably not running on localhost? If so, you should use the address of the back-end service, rather than 0.0.0.0 (which doesn't make sense in any context as a destination address to connect to) or localhost.

Upvotes: 2

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