Fixing CORS policy with Java Spring

If you’re trying to access a resource with Javascript that is on a different server than the location of your website, you probably have got a error similar to “has been blocked by CORS policy: Response to preflight request doesn’t pass access control check ” in your Javascript console when you try to make the request.

If you are using Java Spring framework, you can fix at the class level or method level by adding @CrossOrigin at the top of the class or method. Adding it before the class will apply it to all functions within the class.

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@CrossOrigin(origins = "")
@RequestMapping(value ="/endpoint")
public class MyClass{

Getting and parsing XML in PHP

If you have XML data you need to download, you can download it with file_get_contents($url), which will return file as a string. Then you use simplexml parser to parse through the XML.

You may need to add allow_url_fopen=1 to the php.ini to allow for the file download with file_get_contents.

$url = '';
$xml_str = file_get_contents($url);
$xml_feed = simplexml_load_string($xml_str);
//then you can do a foreach on each row returned on the xml, like so..
foreach($xml_feed as $key => $data){

How to POST JSON content with PHP and curl

If you need to POST json to a url with CURL and PHP, in this case making a POST to this sample code should help you.

$json_data = array(
    'field2' => 'data2');
$url = '';
$json_string = json_encode($json_data);
//curl php library
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json_string); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Content-Length: ' . strlen($data_string)
$result = curl_exec($ch);

Get JSON in POST with PHP

With PHP, you can not use $_POST variable if the content you are POSTing, is JSON. Instead, you must use a different method for getting the JSON data from the POST.

//assures the content being posted is content-type of application/json
if($_SERVER["CONTENT_TYPE"] == 'application/json')
$json_string = file_get_contents('php://input');
$json = json_decode($json_string);
//$json will be an object with the data that was in the POST

How to make an image rotate from center point with CSS

The following CSS will make a image rotate from the center point. This will work with Chrome and Firefox and IE.

    -webkit-animation-name: spinnerRotate;
    -webkit-animation-duration: 4s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-timing-function: linear;
    -moz-animation-name: spinnerRotate;
    -moz-animation-duration: 4s;
    -moz-animation-iteration-count: infinite;
    -moz-animation-timing-function: linear;
    -ms-animation-name: spinnerRotate;
    -ms-animation-duration: 4s;
    -ms-animation-iteration-count: infinite;
    -ms-animation-timing-function: linear;
@-webkit-keyframes spinnerRotate
@-moz-keyframes spinnerRotate
@-ms-keyframes spinnerRotate

With the following HTML

<div id="spin">
<img src="yourImage.png"></img>