Form submission fail when using GET and native Fetch API #3736
Description
GET requests can't have bodies. amp-form should use proper way to pass data (in body through FormData for POST, or as query params for GET) depending on method used.
Chrome 51.0.2704 (Mac OS X 10.11.5) amp-form should call fetchJson with the xhr action and form data FAILED
Error: Uncaught Error: Form submission failed:: Fetch failed https://example.com?__amp_source_origin=http%3A%2F%2Flocalhost%3A9876: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.