Summary: Hi,
While implementing my own `RCTURLRequestHandler` I came across retain cycles in `RCTNetworkTask` when used with `RCTFileRequestHandler` and `RCTDataRequestHandler`.
The `NSBlockOperation` used in `RCTFileRequestHandler` and `RCTDataRequestHandler` could never be dealloc'ed because of a retain cycle.
And then the second issue was that those blocks were also strongly capturing the passed delegate which in this case is the `RCTNetworkTask` itself and then since the task was storing the block as a `requestToken`, the task could never be dealloc'ed as well.
Here are my proposed fixes. Let me know what you think.
Closes https://github.com/facebook/react-native/pull/3884
Reviewed By: svcscm
Differential Revision: D2615353
Pulled By: nicklockwood
fb-gh-sync-id: a73cbecffbebea75aaeb23d39f04a0d87602926f
Summary: public
Added RCTDataRequestHandler, which is responsible for loading data URLs. This moves the logic for data URL handling out of RCTImageDownloader (no longer needed) and into the RCTNetwork library, where it makes more sense.
This also means that it is now possible to load data URLs via XHR, and use them for purposes other than just images.
Reviewed By: javache
Differential Revision: D2540964
fb-gh-sync-id: 4f0418bd6b9186f047cc8297276bb970795af104
Jean Regisser
Nick Lockwood