Again. I repeat. Supl.google.com IS working here.
Dont know why some insists im faking it. I never do.
Might be a carrier/country whatever deal I have no idea, but it gives a good location in ~15 secs.

Again. I repeat. How fast you get a lock means nothing. When I set it to supl.google.com I get cr*p ACWP support, if I enable GPS I get a lock in <30 seconds.
It's *very* hard to reliably test what is going on, I'm using ACWP only as a measure because I can see clear differences between selected servers:
- set desired server
- reboot
- run acwp script I posted

Maybe I should wireshark the connection between n900 and supl.* to show what is going on.

i actually dont really care if supl.google.com is working or not. what's more important to me is the end result i.e. accurate gps lock is achieved in a short time - which is what i am experiencing now. as for the agps cache - no such issue since my phone has a scheduled reboot task that runs everyday.

Fine, but this thread isn't about your ends results (sorry ), but about *real* A-GPS. Not to mention that you *won't* get such good results *if* real A-GPS support would be needed to gain it (quickly) in the first place, but frankly, we don't care about you results. We care about A-GPS (in this thread, at least).
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Now, about the real things:

Very good idea. As said earlier, I remember someone respectable to mention, that even supl.nokia.com works *fully*, if A-GPS request is passed through a middle-man A-GPS server installed on N900 (the way, that local server "ask" supl.nokia.com, instead of N900 "asking" directly).

I can find the source quote for a life of mine, but it would be very interesting to RE it - after all, supl.nokia.com works for recently released Nokia devices. I bet, that they're filtering out requesting devices on purpose.

Knowing WTF is going on and what they use to identify, we could implement a way to mimic other device for our trusty N900 (and even implement possibility to do it from control panel, via CSSU, just like browser allow to change user agent).

/Estel

Has someone packaged the proxy software at http://www.tajuma.com/supl/ somewhere?

I believe this is what Estel is referring to. Nice find...

It could also give us a way to simply push the data ourselves. More often than not when people use GPS they know roughly where they are (city, state, etc). Even if the AGPS guess is off by a good distance, it doesn't change the satellite constellation the GPS is looking for that much. If one could even set/enter rough default coordinates, as long as you're in the ball park (+/- a degree) it will cut the time needed for GPS to lock dramatically.

While the GPS code is closed (preventing us from directly injecting a guess at a starting point), this may be a good way to fake it. A local supl server that computes a rough guess and feeds it to the closed source that then injects the right data.

Would be a popular project if someone's willing to take it up.

not quite that simple. The location servers return with a limited information, cached, making a near - but not complete set of location data. This data is cached. And the difference I believe. Is that the set of data is a bit late. Not real time. But, ofcourse we could cache similat response

So what is the consensus, would this intermediate proxy still work? Seems odd that supl.nokia allows the n9 et al but not the n900 yet would allow some arbitrary proxy supl. Or is it a certificate /ssl issue? Wireshark did not show ssl packets to supl.vodafone on my n900. It showed sslv3 for imap traffic.

But I am on one tenth knowledge here so someone smart with both an n9 and a n900 should sniff both supl'ing away...

I was trying the supl proxy on my server and pointing my N900 to it. However results were inconclusive, I wasn't sure if my N900 was even happy with my supl server's certificates, making it tough to see what the real problem was...
I definitely did see some wireshark activity on port 7275 however, but didn't pursue it further after getting T-Mobile's server working... Granted a public server would be better as then it would also work on wifi...