* fix: start node strem asyncly
* fix: headers value may be a list
* fix: simply destruct on finish/error
* fix: class may destruct immediately after subscribing "data"
* fix: send meaningful error
* fix: must always provide a response body
* fix: handle the case when one write can not write all data
* fix: handle connection error
* Parse stream protocol handler
* Pipe node stream to mojo
* Merge the parser for headers
* Add ToDict helper to simplify code
* Simplify dispatching logic
* Add an experimental API for returning any type of response
* Fix subscribing event
* URL loaders' lifetime is independent of the factory
* HandleError helper is no longer needed
* Rename "SendResponse" => "StartLoading" to follow naming conventions
* Delete when connection error happens
* Fix cpplint warning
