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Summary: This allows the use of different bundle URLs & ports in Dev mode. (ie. ngrok url shared with a team member)
The bundle URL can be changed via the normal Dev Menu, or programmatically by setting the `debug_http_host` shared preference key.
For example, in your apps `MainActivity.java` before creating your `ReactRootView`:
```java
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getApplication());
SharedPreferences.Editor editor = mPreferences.edit();
editor.putString("debug_http_host", "my.customurlandport.com:8888");
editor.commit();
```
**Breaking change**: Custom bundle URLs added via the Dev Menu will need to also include the port. This has been noted in the documentation and also on the preference description in the Dev Menu.
Addresses: https://github.com/facebook/react-native/issues/2704
Closes https://github.com/facebook/react-native/pull/2824
Reviewed By: @svcscm
Differential Revision: D2540450
Pulled By: @javache
fb-gh-sync-id: a053de91e3095bb67640bb0f1b8761e55775bc9c