Re: Option to define external link handler

Rodrigo Arias <rodarima-Re5JQEeQqe8AvxtiuMwx3w-XMD5yJDbdMReXY1tMh2IBg@public.gmane.org> wrote:
> The solution with the new design would involve:
> 
> 1) Open a "gemini:" link
> 2) The request is routed to the gemini: dpi handler (like now)
> 3) The gemini plugin returns the .gmi file as-is as an HTTP response,
> instead of converting it to HTML
> 4) The .gmi mime type matches a rewrite rule and is rewritten into HTML
> in the SED node.
> 
> Now, if we open a .gmi via HTTP:
> 
> 1) Open a "https:" link
> 2) The request is routed to the usual HTTP/IO/TLS chain
> 3) The HTTP server returns the .gmi file as-is as an HTTP response.
> 4) The .gmi mime type matches a rewrite rule, and is rewritten into HTML
> in the SED node.
> 
> Notice that the HTTP content can be compressed. So, for example, this
> simple rewrite script:
> 
>   #!/bin/sh
>   sed 's_www.youtube.com_inv.vern.cc_g'
> 
> Would only work well in the SED node *after* the HTTP content is
> uncompressed and the headers removed. The rewrite rules should indicate
> in which position of the chain they apply.

This mechanism might suit an idea I've had to do remote downscaling
of extremely large images, which are increasingly being included in
web pages. The script would send a list of URLs in all <img> tags
within the HTML to a remote server (eg. on a VPS), or ideally just
the ones for large image files, then rewrite the URLs in the HTML
to point to the remote server where the converted images are
available over HTTP/S.

Or a deeper approach would be to apply the same approach as this
rewrite engine to binary content as well, and have Dillo do it
transparently via 'rewrite'/convert rules for image MIME types.
Then the HTML would stay the same and Dillo would trigger a command
that requested a downscaled image from the converter server instead
of the original image's server. That would be more elegant, but
expands the scope of your proposed system a little.

Maybe since it still requires a remote Web server this problem
would be better solved via a Web proxy (I did look into Squid
before, but drowned in confusing documentation). But I just thought
I'd mention it as an example of a more complex usage for this
proposed rewrite system.
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