Ajax And Local Network gives "No 'Access-Control-Allow-Origin' header"

Question

I need to send a GET request to a file on the local network. But I always get a No Acces-Control-Allow-Origin header. I am doing this from my pc already in the local network. But it is the same when I do this over my domainname. I am doing this in javascript with an Ajax-call to a php script.

this is my ajax-call:

$.ajax({
    data: {},
    url: 'http://192.168.2.100/php/checkForHomeNetwork.php',
    method: 'GET',
    datatype: 'json',
    async: false,
    cache: false,
    timeout: 30000,
    success: function(msg) {
        alert(msg);
    }
});

don't use async false ... it is deprecated by browsers and you should be seeing warning about it in console. It is a terrible practice since it blocks the UI — charlietfl, Jan 18 '16 at 21:55
Yes, my UI needs to wait before doing something else, how can I fix this? — vanlooverenkoen, Jan 18 '16 at 22:01
Consume the data in success callback or promise returned from `$.ajax` ... see http://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call — charlietfl, Jan 18 '16 at 22:03
Oke, and that wil do exactly the same as assync? will it run the code folowing on the ajax call or will it alwayswait till the ajaxcall is succes or failed — vanlooverenkoen, Jan 18 '16 at 22:07
whatever is dependent on that ajax. Can wrap the other code in a function and call that function if it helps organization better — charlietfl, Jan 18 '16 at 22:12
Do you know if there is a way to create a cross-domain request in ajax — vanlooverenkoen, Jan 18 '16 at 22:17
I see now what You mean with blocking the UI. before I had no problem but now after adding a new must-have feature for my website the webiste blocks completely till all ajaxcalls are completed. Thanks — vanlooverenkoen, Jan 19 '16 at 10:33
I am trying to rewrite this, but I am using a for loop, and each iteration, there needs I make a async ajaxcall, Is there a way to do this? — vanlooverenkoen, Jan 26 '16 at 20:34
yes ..numerous ways. Suggest start new question. There are also lots and lots of posts on this site about it — charlietfl, Jan 26 '16 at 20:42
For detailed tutorial explanation: http://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call — charlietfl, Jan 26 '16 at 20:43

score 2 · Accepted Answer · answered Jan 18 '16 at 21:53

2

The same-origin policy doesn't care about what network you're on. If the domain portion of the URL (including "http"/"https", the domain name string, and port number) are not exactly the same, then it's considered to be a cross-domain request.

The PHP script can of course be made to include the appropriate headers when it sees a request from that trusted domain.

answered Jan 18 '16 at 21:53

Pointy

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Yes i have read that somewhere but can't how I need to add the other domains and portnumers – vanlooverenkoen Jan 18 '16 at 21:59
@KoenVanLooveren it's something you have to do from the PHP service you're invoking. [Here is some information.](https://remysharp.com/2011/04/21/getting-cors-working) You can probably find many other examples out there. – Pointy Jan 18 '16 at 22:17
But then it is serverside? I need to check if the client can reach that php file. Not the server – vanlooverenkoen Jan 18 '16 at 22:19
But that is serverside? Isn't it? – vanlooverenkoen Jan 18 '16 at 22:20
You can't do it from the client. The browser will simply disallow access to different domains *unless* the target URL responds with correct headers. It's a security measure and the browser deliberately stops you from solving the problem in the client (JavaScript) code. – Pointy Jan 18 '16 at 22:27

Ajax And Local Network gives "No 'Access-Control-Allow-Origin' header"

1 Answers1