# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS ou "Cross-Origin Resource Sharing"</a> refere-se às situações em que um frontend rodando em um navegador possui um código JavaScript que se comunica com um backend, e o backend está em uma "origem" diferente do frontend.

## Origem { #origin }

		// Built-in user should be imported without errors even if LDAP is
		// enabled.
		allUsersFile: `{
  "foo": {
    "secretKey": "foobar123",

		// To trigger the race:
		// 1) lk3 or lk4 need to advance and increment the ref on the existing resource,
		//    successfully acquiring the lock.
		// 2) lk2 then needs to advance and remove the resource from lockMap.
		// 3) lk3 or lk4 (whichever didn't execute in step 1) then executes and creates
		//    a new entry in lockMap and acquires a lock for the same resource.

		<-lk2ch
		lk3ok := <-lk3ch
		lk4ok := <-lk4ch

		if lk3ok && lk4ok {

# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS o "Cross-Origin Resource Sharing"</a> se refiere a situaciones en las que un frontend que se ejecuta en un navegador tiene código JavaScript que se comunica con un backend, y el backend está en un "origen" diferente al frontend.

## Origen { #origin }

# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS or "Cross-Origin Resource Sharing"</a> refers to the situations when a frontend running in a browser has JavaScript code that communicates with a backend, and the backend is in a different "origin" than the frontend.

## Origin { #origin }

# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

 "Version": "2012-10-17",
 "Statement": [
  {
   "Effect": "Allow",
   "Action": [
    "s3:ListBucket"
   ],
   "Resource": [
    "arn:aws:s3:::%s"
   ]
  },
  {
   "Effect": "Allow",
   "Action": [
    "s3:PutObject",
    "s3:GetObject"
   ],
   "Resource": [
    "arn:aws:s3:::%s/*"
   ]
  }
 ]
}`, bucket, bucket)
	err = s.adm.AddCannedPolicy(ctx, policy, policyBytes)

This is a resource file for testing purpose....

   * @param sources the sources to concatenate
   * @return a {@code CharSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}
   * @since 15.0
   */
  public static CharSource concat(CharSource... sources) {
    return concat(ImmutableList.copyOf(sources));
  }

  /**
   * Returns a view of the given character sequence as a {@link CharSource}. The behavior of the

   * @param sources the sources to concatenate
   * @return a {@code CharSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}
   * @since 15.0
   */
  public static CharSource concat(CharSource... sources) {
    return concat(ImmutableList.copyOf(sources));
  }

  /**
   * Returns a view of the given character sequence as a {@link CharSource}. The behavior of the