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php – enabling cors in codeigniter ( restserver by @chriskacerguis )

Posted by: admin July 12, 2020 Leave a comment

Questions:

http.get request in agularJs controller works fine when my client app and api are in localhost.
when api is moved to server., issue arised.

client side using angularJs

$http.get('http://domain.com/api/spots/2/0').success(function(datas){
console.log(datas);
});

log gives:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://domain.com/api/spots/2/0. This can be fixed by moving the resource to the same domain or enabling CORS.

i have added these two lines to my controller construct

header("Access-Control-Allow-Origin: *");

header("Access-Control-Allow-Methods: GET");

still same error.

How to&Answers:

Try adding OPTIONS to the allowed methods.

header("Access-Control-Allow-Methods: GET, OPTIONS");
header("Access-Control-Allow-Headers: Content-Type, Content-Length, Accept-Encoding");

and return immediately when the request is method ‘OPTIONS’ once you have set the headers.

if ( "OPTIONS" === $_SERVER['REQUEST_METHOD'] ) {
    die();
}

See also this answer.

Angular sends a W3C CORS spec compliant preflight request that will check for the right allowed methods before actually attempting it.

Personally, I find the Mozilla Developer Network CORS page a bit easier to read on the matter to help understand the flow of CORS.

Answer:

If anyone else is facing the issue, enabling CORS in rest.php file of Codeigniter REST Controller worked for me. This is also clearly documented in comments here https://github.com/chriskacerguis/codeigniter-restserver/blob/master/application/config/rest.php

//Change this to TRUE
$config['check_cors'] = TRUE;

//No change here
$config['allowed_cors_headers'] = [
  'Origin',
  'X-Requested-With',
  'Content-Type',
  'Accept',
  'Access-Control-Request-Method'
];

//No change here
$config['allowed_cors_methods'] = [
  'GET',
  'POST',
  'OPTIONS',
  'PUT',
  'PATCH',
  'DELETE'
];

//Set to TRUE to enable Cross-Origin Resource Sharing (CORS) from any source domain
$config['allow_any_cors_domain'] = TRUE;


//Used if $config['check_cors'] is set to TRUE and $config['allow_any_cors_domain'] is set to FALSE. 
//Set all the allowable domains within the array
//e.g. $config['allowed_origins'] =['http://www.example.com','https://spa.example.com']

$config['allowed_cors_origins'] = [];

Answer:

I’ve added the following constructor in my controller class

public function __construct($config = 'rest')
{
    header('Access-Control-Allow-Origin: *');
    header("Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE");
    parent::__construct();
}

Answer:

Client side => AngularJs (running with Grunt in localhost:9000)
Server side => php (codeIgniter solution) (running in localhost:80)

The only thing that worked for me was to add this lines into the webservices controller in my php project:

         /*
           here you do whatever you do to build the $data 

         */

        //but just before returning the method data add this

        header('Content-type: application/json');
        header("Access-Control-Allow-Origin: *");
        header("Access-Control-Allow-Methods: GET");
        header("Access-Control-Allow-Methods: GET, OPTIONS");
        header("Access-Control-Allow-Headers: Content-Type, Content-Length, Accept-Encoding");
        echo json_encode($data, JSON_NUMERIC_CHECK);

Answer:

if you can use jQuery Ajax, then use this line in your script.

jQuery.support.cors = true; // force cross-site scripting (as of jQuery 1.5)

it solved the problem for me when i tried to post some string using jQuery Ajax from sidebar desktop gadget to the xampp php file.

Answer:

To add to the answer by @amal-ajith headers should be added in the rest.php file. For example I needed to add my authorization token for Ionic 4 app api calls/requests and all I needed to do was add the header field the rest.php file and my cors error was taken care of.

Access to XMLHttpRequest at 'http://localhost/ci/index.php/api/validate_token' from origin 'http://localhost:8100' has been blocked by CORS policy: Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight response.

//No change here
$config['allowed_cors_headers'] = [
  'Origin',
  'X-Requested-With',
  'Content-Type',
  'Accept',
  'Access-Control-Request-Method',
  'Authorization'
];