webdav should use PROPFIND instead of OPTIONS call to check for server

[prabirshrestha]

Some webdav servers don't have OPTIONS configured. Option makes sense for browsers and not clients. Looking at other ios clients for webdav, they seem to use PROPFIND to verify the server credentials instead of using OPTIONS. Is it possible for switch this so OPTIONS calls doesn't need to be configured on the server?

ccViewer/RemoteCloud/RemoteCloud/Storages/WebDAVStorage.swift

Lines 197 to 208 in a58bbc7

	func checkServer() {
	guard let url = URL(string: uri) else {
	activityIndicatorView.stopAnimating()
	return
	}
	testState = 0
	var request: URLRequest = URLRequest(url: url)
	request.httpMethod = "OPTIONS"
	let task = dataSession.dataTask(with: request)
	task.resume()
	}

[prabirshrestha]

Similarly HEAD shouldn't be called and instead use PROPFIND with depth=0 header so it works for files or dir.

ccViewer/RemoteCloud/RemoteCloud/Storages/WebDAVStorage.swift

Lines 271 to 282 in a58bbc7

	if let server = response.allHeaderFields["Server"] as? String {
	/* Only check HEAD for non-Caddy webdav servers */
	if server.contains("Caddy") {
	done = true
	onFinish(uri, user, pass)
	}
	}
	var request: URLRequest = URLRequest(url: url)
	request.httpMethod = "HEAD"
	let task = dataSession.dataTask(with: request)
	testState = 1
	task.resume()