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[ANN] twins, a Gemini server written in Go

1. trevor (a) rocketnine.space (trevor (a) rocketnine.space)

twins, a Gemini server written in Go, is now available.

Features:
- Serve static files
  - List directories (when enabled)
- Reverse proxy requests
  - TCP
  - FastCGI
- Serve system command output
- Reload configuration on SIGHUP

twins makes it easy to host a Gemini site. Domains, paths and resources are
specified via YAML. Dynamic sites powered by PHP, Python, etc. may be hosted
using FastCGI.

twins includes the response body size in the media type header by default. This
enables user experience improvements in Gemini clients, such as indicating
download progress. It is possible to disable this feature.

Website: gemini://twins.rocketnine.space
Repository: https://gitlab.com/tslocum/twins

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2. colecmac (a) protonmail.com (colecmac (a) protonmail.com)


>     twins includes the response body size in the media type header by default. This
>     enables user experience improvements in Gemini clients, such as indicating
>     download progress. It is possible to disable this feature.

For anyone wondering what that looks like:

? gemget --header -o- gemini://twins.rocketnine.space/
Info: Started gemini://twins.rocketnine.space/
Header: 20 text/gemini; charset=utf-8; size=1128


It looks like a nice server, but to be honest I would remove this.
Serving non-standards is not what Gemini is about imo, and it's how
the Web became what it is today. And clients in general should be
strict and not accept things out-of-spec. For example Amfora won't
allow non-standard status codes, even if the first digit matches a
known code. It doesn't check for non-standard MIME params, but maybe
it should?

Anyway, thanks for sharing. How was the experience of the server
development?


makeworld

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3. Sean Conner (sean (a) conman.org)

It was thus said that the Great colecmac at protonmail.com once stated:
> 
> >     twins includes the response body size in the media type header by default. This
> >     enables user experience improvements in Gemini clients, such as indicating
> >     download progress. It is possible to disable this feature.
> 
> For anyone wondering what that looks like:
> 
> ? gemget --header -o- gemini://twins.rocketnine.space/
> Info: Started gemini://twins.rocketnine.space/
> Header: 20 text/gemini; charset=utf-8; size=1128
> 
> 
> It looks like a nice server, but to be honest I would remove this.
> Serving non-standards is not what Gemini is about imo, and it's how
> the Web became what it is today. And clients in general should be
> strict and not accept things out-of-spec. For example Amfora won't
> allow non-standard status codes, even if the first digit matches a
> known code. It doesn't check for non-standard MIME params, but maybe
> it should?

  So what are the standard MIME parameters for text/plain?  text/markdown? 
text/html?  multipart/alternate?  And what should a client do when it
encounters a non-standard MIME parameter?

  -spc

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4. khuxkm (a) tilde.team (khuxkm (a) tilde.team)

November 6, 2020 11:15 PM, colecmac at protonmail.com wrote:

> It looks like a nice server, but to be honest I would remove this.
> Serving non-standards is not what Gemini is about imo, and it's how
> the Web became what it is today. And clients in general should be
> strict and not accept things out-of-spec. For example Amfora won't
> allow non-standard status codes, even if the first digit matches a
> known code. It doesn't check for non-standard MIME params, but maybe
> it should?

I don't agree that clients should be strict, because that adds more 
trouble onto a client. Take 2 minutes and try to find how to parse MIME 
types and parameters in Python.

...

See how easy that was? Just use a method in the cgi module, or maybe even 
a third party lib. Now take 2 minutes and try to find a Python library 
that can tell when a non-standard mimetype parameter is used.

...

You probably couldn't find anything. I sure couldn't. This doesn't even 
take into account the lack of forward compatibility (what happens if a new 
mimetype gets defined with new parameters? now what, every client *must* 
update to handle it?)

Just my 2 cents,
Robert "khuxkm" Miles

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5. John Cowan (cowan (a) ccil.org)

On Sat, Nov 7, 2020 at 12:17 AM Sean Conner <sean at conman.org> wrote:

So what are the standard MIME parameters for text/plain?


If you go to <https://www.iana.org/assignments/media-types/media-types.xhtml>,
the IANA registration for MIME-types, you'll find links under text/plain to
RFCs 2046 (optional charset parameter), 3676 (optional format and delsp
parameters), and 5147 (not sure why it's here; no parameters).

text/markdown?
>

The same process gets you to RFC 7763 (mandatory charset, optional variant).

text/html?


Charset (optional).

> multipart/alternate?


Boundary (required)

> And what should a client do when it
> encounters a non-standard MIME parameter?
>

Ah.  Now that's from RFC 2045:

   Parameters are modifiers of the media subtype, and as such do not
   fundamentally affect the nature of the content.  The set of
   meaningful parameters depends on the media type and subtype.  Most
   parameters are associated with a single specific subtype.  However, a
   given top-level media type may define parameters which are applicable
   to any subtype of that type.  Parameters may be required by their
   defining media type or subtype or they may be optional.  MIME
   implementations must also ignore any parameters whose names they do
   not recognize.

The last sentence is the critical one.  Add any parameters you want,
because clients must ignore them.

As for parsing, per RFC 2045 just use split() to split by semicolons; the
first result is the type/subtype, and on each of the rest, strip out all
spaces and then split them on the equal sign to separate name from value.



John Cowan          http://vrici.lojban.org/~cowan        cowan at ccil.org
Do what you will / this Life's a Fiction
And is made up of / Contradiction.  --William Blake
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