Ionic 5 Get Request to Slim API - php

Question

I would like to make a get request from my Ionic app to an API build with the Slim Framework.
This is the code of the API:
<?php
header('Access-Control-Allow-Origin: *');
header('Content-Type: application/json');
?>
<?php
use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;
use Tuupola\Middleware\HttpBasicAuthentication;
require 'vendor/autoload.php';
$jwt_secret = '**************';
$app = new Slim\App;
$app->add(new Tuupola\Middleware\JwtAuthentication([
"path" => "/api",
"attribute" => "jwt",
"secret" => $jwt_secret, "error" => function ($response, $arguments) {
$data["status"] = "error";
$data["message"] = $arguments["message"];
return $response
->withHeader("Content-Type", "application/json")
->withHeader("Access-Control-Allow-Origin", "*")
->getBody()->write(json_encode($data, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT));
}
]));
$app->get('/api/hello', function (Request $request, Response $response, array $args)
{
$decoded = $request->getAttribute("jwt");
$response->getBody()->write(json_encode(array("status"=> "200", "message" => "HELLO ".$decoded['uid'] ." - " . $decoded['cus'])));
return $response;
});
$app->get('/', function (Request $request, Response $response, array $args) {
$response->getBody()->write(json_encode(array("status"=> "200", "message" => "Welcome to the API")));
return $response;
});
$app->run();
?>
When I'm testing with postman the API works fine. But when I'm trying to call it with the HTTPClient in Ionic, it doesn't work. This is my Ionic Code:
import { Component } from '#angular/core';
import { HttpClient, HttpHeaders } from '#angular/common/http';
#Component({
selector: 'app-home',
templateUrl: 'home.page.html',
styleUrls: ['home.page.scss'],
})
export class HomePage {
constructor(private http: HttpClient)
{
}
sendRequest()
{
this.http.get('http://localhost/slim3',).subscribe((data)=>console.log(data));
}
}
The Error message is the following:
:8100/home:1 Access to XMLHttpRequest at 'http://localhost/slim3' from origin 'http://localhost:8100' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
core.js:6014 ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: "http://localhost/slim3", ok: false, …}
How can I fix it? Thanks!

Answer 1

You must enable CORS(What is CORS?) in Slim Framework. Check http://www.slimframework.com/docs/v3/cookbook/enable-cors.html
Add this before $app->run(); (replacing http://mysite by your url, including port)
$app->options('/{routes:.+}', function ($request, $response, $args) {
return $response;
});
$app->add(function ($req, $res, $next) {
$response = $next($req, $res);
return $response
->withHeader('Access-Control-Allow-Origin', 'http://mysite')
->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS');
});