xhr library Null safety
The interface provides a way to easily construct a set of
key/value pairs representing form fields and their values, which
can then be easily sent using the XMLHttpRequest.send() method.
It uses the same format a form would use if the encoding type
were set to
The interface represents events measuring progress of an
underlying process, like an HTTP request (for an
XMLHttpRequest, or the loading of the underlying resource of an
- (XHR) objects are used to interact with servers. You can retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just part of a page without disrupting what the user is doing. is used heavily in AJAX programming. [...]
- is the interface that describes the event handlers you can implement in an object that will handle events for an XMLHttpRequest.