Questions[twisted](server)

We are using a Twisted HTTP server https://twistedmatrix.com/documents/15.0.0/web/howto/using-twistedweb.html and we are experiencing a strange behavior.

This HTTP server serves a static file and in some cases it may returns a 403 to one person (tested in the office) while the rest of the team can download the file without any problem.

If the person receiving a 403 runs a curl the curl works fine, it looks like is something browser specific but my question is can a HTTP server error be cached for a specific request?

After a while the static file can be download fine by the user experiencing a 403.

Also how a 403 (forbidden error) can just affect to just a single request and not to everybody? note there is not any kind of authentication.

Edit: As far as I have tested, looks like the problem just appears in Google Chrome, with Firefox or curl it gets rendered fine although Chrome keeps giving me a 403. That browser is caching somehow the petition and if I try with incognito mode it works fine.

I'm developing a real-time mobile app by setting up a TCP connection between the app and server backend. Each user can send messages to all other users.

(I'm making the TCP server in Python with Twisted, am creating my own 'protocol' for communication between the app/backend and hosting it on Amazon Web Services.)

Currently I'm trying to make the backend scalable (and reliable). As far as I can tell, the system could cope with more users by upgrading to a bigger server (which could become rather limiting), or by adding new servers in a cluster configuration - i.e. having several servers sitting behind a load balancer, probably with 1 database they all access.

I have sketched out the rough architecture of this:

However what if the Red user sends a message to all other connected users? Red's server has a TCP connection with Red, but not with Green.

I can think of a one way to deal with this problem:

• Each server could have an open TCP (or SSL) connection with each other server. When one server wants to send a message to all users it simply passes this along it's connection to the other servers. A record could be kept in the database of which servers are online (and their IP address), and one of the servers could be a boss - i.e. decides if others are up and running, if not it could remove them from the database (if a server was up and lost it's connection to the boss it could check the database and see if it had been removed, and restart if it had - else it could assume the boss was down.)

Clearly this needs refinement but shows the general principle.

Alternatively I'm not sure if this is possible (- definitely seems like wishful thinking on my part):

• Perhaps users could just connect to a box or router, and all servers could message all users through it?

If you know how to cluster TCP servers effectively, or a design pattern that provides a solution, or have any comments at all, then I would be very grateful. Thank you :-)

CentOS 5.5 is using the old python 2.4 ! But I want to install Twisted on it ! Does anyone maintain a RPM of this library ?

Can I install the "Twisted" package from Lucid onto Karmic?

My question relates to my previous question but I realized that my previous question was off the mark.

I'm using a hosting service so I don't have access to root (just a user account) and my Apache web server is a Virtual Host running on port 80. The DocumentRoot is http://build.website.org and is at /home/myname/build.website.org/ on the file system.

I want to run multiple buildbot masters and display build results for the projects project1, project2 etc. at http://build.website.org/project1/, http://build.website.org/project2/ etc.

I set up my first buildbot master with the twisted web server on port 8010 and can access the content by going to http://build.website.org:8010 but I can't figure out how to make the content on http://build.website.org:8010 visible at http://build.website.org/project1/

So, I want to know if it makes sense to have a unique twisted server for each master? And, how I should make http://build.website.org:801N visible at http://build.website.org/projectN/ (if this is the correct way to go about doing this)?

Sorry, I'm very new to web admin issues and need very detailed help.