Access-Control-Allow-Origin

Third Party Coronium
1

Hi,

I am trying to connect to my Coronium Cloud server from another server, I am getting NO Access-Control-Allow-Origin error in the browser.

Is there a way to config Access-Control-Allow-Origin to accept connections from my second server?

Thanks

Rui

2

Hi,

I’m afraid I don’t really have an answer for you, as that is a non-standard way of using Coronium.

Cheers.

3

Thanks for the prompt reply…

4

If you want to do this in pure javascript you will want to research CORS. Here is a stackoverflow post that can get you started http://stackoverflow.com/questions/3076414/ways-to-circumvent-the-same-origin-policy. It is not a trivial setup and will require some NGINX configuration.

 

My suggestion however is to have your javascript make a call to your web-server and then have the web-server make the call to your Coronium server. This would be similar to what I suggested here https://forums.coronalabs.com/topic/63624-read-sql-database-from-a-webpage/ for exposing MySql.

 

Pros:

  1. You should not experience the CORS issue as the browser is calling a script on your web-server domain
  2. You will not expose your API credentials in the browser
  3. This is typically easier to debug

Cons:

  1. Your web-server now has to help with the processing - should not be a big deal
  2. If you have high latency it will be compounded - again this should not be an issue and if so is more than likely something another problem you should fix. 
5

Hi Steven,

Thanks for your time, really appreciated,

Great answer, help me a lot, now I understand that CORS thing,

Take care,

Rui

6

Hi,

I’m afraid I don’t really have an answer for you, as that is a non-standard way of using Coronium.

Cheers.

7

Thanks for the prompt reply…

8

If you want to do this in pure javascript you will want to research CORS. Here is a stackoverflow post that can get you started http://stackoverflow.com/questions/3076414/ways-to-circumvent-the-same-origin-policy. It is not a trivial setup and will require some NGINX configuration.

 

My suggestion however is to have your javascript make a call to your web-server and then have the web-server make the call to your Coronium server. This would be similar to what I suggested here https://forums.coronalabs.com/topic/63624-read-sql-database-from-a-webpage/ for exposing MySql.

 

Pros:

  1. You should not experience the CORS issue as the browser is calling a script on your web-server domain
  2. You will not expose your API credentials in the browser
  3. This is typically easier to debug

Cons:

  1. Your web-server now has to help with the processing - should not be a big deal
  2. If you have high latency it will be compounded - again this should not be an issue and if so is more than likely something another problem you should fix. 
9

Hi Steven,

Thanks for your time, really appreciated,

Great answer, help me a lot, now I understand that CORS thing,

Take care,

Rui