Added optional additional headers to createPlayer config for FetchStreamLoader

Author: yyyar

docs/api.md

@@ -88,6 +88,7 @@ In multipart mode, `duration` `filesize` `url` field in `MediaDataSource` struct
 | `customSeekHandler?`             | `object`  | `undefined`                  | Indicates a custom seek handler          |
 | `reuseRedirectedURL?`            | `boolean` | `false`                      | Reuse 301/302 redirected url for subsequence request like seek, reconnect, etc. |
 | `referrerPolicy?`                | `string`  | `no-referrer-when-downgrade` | Indicates the [Referrer Policy][] when using FetchStreamLoader |
+| `headers?`                       | `object`  | `undefined`                  | Indicates additional headers that will be added to request when using FetchStreamLoader |
 
 
 [Referrer Policy]: https://w3c.github.io/webappsec-referrer-policy/#referrer-policy

src/io/fetch-stream-loader.js

@@ -94,6 +94,13 @@ class FetchStreamLoader extends BaseLoader {
             referrerPolicy: 'no-referrer-when-downgrade'
         };
 
+        // add additional headers
+        if (typeof this._config.headers === 'object') {
+            for (let key in this._config.headers) {
+                headers.append(key, this._config.headers[key]);
+            }
+        }
+
         // cors is enabled by default
         if (dataSource.cors === false) {
             // no-cors means 'disregard cors policy', which can only be used in ServiceWorker
@@ -230,4 +237,4 @@ class FetchStreamLoader extends BaseLoader {
 
 }
 
-export default FetchStreamLoader;
+export default FetchStreamLoader;