@GET @ApiIgnore // until documented
  @Produces("text/plain")
  public Response getClusterStackVersions(@Context HttpHeaders headers, @Context UriInfo ui) {
    return handleRequest(headers, null, ui, Request.Type.GET, createResource(null));
  }
Gets all cluster stack versions.
Handles: GET /clusters/{clustername}/stack_versions requests.

@param headers http headers
@param ui      uri info

@return information regarding all cluster stack versions
ambari-server/src/main/java/org/apache/ambari/server/api/services/ClusterStackVersionService.java