[Tech] Useless statistics of the day: status codes

[Solene Rapenne]

On Mon, 4 Jan 2021 11:53:41 +0100
Stephane Bortzmeyer <stephane at sources.org>:

> In the database of the Lupa crawler
> <gemini://gemini.bortzmeyer.org/software/lupa/>, I find the following
> status codes (by order of decreasing frequency):
> 
> (The status codes are documented in
> <gemini://gemini.circumlunar.space/docs/specification.gmi#fragments_could_be_useful_to_indicate_the_exact_section>.)
> 
> 20 : OK
> 51 : Not found, because many links no longer work, already, or may be
> never worked
> 31 : Permanent redirection (Lupa adds the target URI to its database
> but keeps the original one)
> 30 : Temporary redirection
> 10 : Input, there are 310 URI replying by asking for input
> 50 : Permanent failure, something wrong in the server
> 40 : Temporary failure, server overloaded?
> 60 : Client certificate required, 40 URI require this authentication
> 42 : The ultimate answer (no, actually, CGI error)
> 53 : Proxy request refused (typically a name pointing to an IP address
> where the server is not configured for this virtual host)
> 
> The rest is marginal, less than ten URI:
> 
> 49 : First status code I find which is not in the official
> specification. Anyone has an idea? Two URI.
> 2 : Old server with the deprecated one-digit status codes?
> 39 : Not in the official specification. Anyone has an idea? Two URI.
> 59 : Bad request (no idea why my client sends bad requests)
> 99 : Not in the official specification. Anyone has an idea? Two URI.
> 58 : Not in the official specification. Anyone has an idea? Two URI.
> 29 : Not in the official specification. Anyone has an idea? Two URI.
> 43 : Proxy error. Reason unknown.
> 61 : Certificate not authorised. Since I do not send client
> certificates, this is surprising.
> 41 : Server not available (maintenance, for instance).
> 52 : Gone. Like 51 but final. Just one URI,
> <gemini://gemini.conman.org/no-longer-here/> so it's probably a test.
> 22 : Not in the official specification. Anyone has an idea? One URI.
> 69 : Not in the official specification. Anyone has an idea? One URI.
> 19 : Not in the official specification. Anyone has an idea? One URI.
> 
> The number of status codes not registered in the specification may
> mean that some servers are extending the Gemini protocol with unused
> status codes. But some are also in test capsules like
> <gemini://gemini.conman.org/> or <gemini://egsam.glv.one/>.
> 
> Note that Lupa did not find even one occurrence of:
> 
> 11 : Sensitive input
> 44 : Slow down (may be because the crawler is nice)
> 62 : Certificate not valid (which makes sense since I don't send
> certificates)

My server may be the cause of the 39 codes. When I have read the
specs I missed the appendix so I assumed all 3x code were fine for
redirecting and I chose 39.  While looking why Amfora client was
complaining about "unknown status core 39" on irc #gemini, I've
been told to look at the appendix and I realized my mistake.