english docs: CORS

docs_eng/cors.md

@@ -1,4 +1,23 @@
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+# Cross-Origin Resource Sharing (CORS)
+
+API supports the CORS technology for requesting browser data from any domain.
+This method is preferable to JSONP. Moreover, unlike JSONP, it is not limited by
+the GET method.
+
+To debug requests using CORS, a special URL is available in API: `/cors`. It
+supports the HEAD, GET, POST, PUT, DELETE methods. A request with any of these
+methods will return the standard response:
+
+```json
+{
+    "method": "GET",
+    "time": "2013-11-18T13:23:17+0400",
+    "origin": null,
+}
+```
+
+| Name   | Type         | Description                                               |
+|--------|--------------|-----------------------------------------------------------|
+| method | string       | method used in the request (HEAD, GET, POST, PUT, DELETE) |
+| time   | string       | current time                                              |
+| origin | string, null | Origin title value in the request, or null                |