I don't think tramp will work in this way, at least not without some
sort of special client running on the remote http server and
modifications to tramp to work with that client. The HTTP protocol will
not easily fit with tramp - in fact, it is such a big 'disconnect'
between tramp and http, you really would be trying to push a round peg
into a square hole. It would be far easier to use other built-in bits of
Emacs functionality along with some sort of remote http service agent to
satisfy this use case (assuming you want bi-directional updates
i.e. pull down an org file, update and push back up - just pulling down
the file and appending it would be easy enough, but going the other way
adds a lot of additional complexity).

Perhaps this is more something which could fit in with mobile org
efforts?

Tim

Eric S Fraga <esflists@gmail.com> writes:

> On Monday, 20 Nov 2017 at 21:13, numbchild@gmail.com wrote:
>> I have similar function requirement. Based on your TRAMP method, I think
>> remote file are just can be transported through any protocols like HTTP,
>> for example remote file like http://example.org/test.org can be downloaded,
>> then append to org-agenda files list. This is just an rough idea.
>
> I am not sure this is possible.  If I try http: as the protocol, tramp
> tells me that only localhost is allowed.  Maybe I do not have tramp
> configured properly?


--

Tim Cross