[Lazarus] GUI development for web UI

[Joost van der Sluis]

On Wed, 2010-12-01 at 15:51 +0100, michael.vancanneyt at wisa.be wrote:
> 
> On Wed, 1 Dec 2010, Joost van der Sluis wrote:
> 
> >>
> >> The can do the same thing:
> >> By default, a fastcgi process is started by the webserver, passing it the
> >> socket on which it should listen.
> >
> > Most imporant difference is that mod_fastcgi is deprecated and doesn't
> > follow the FastCGI standard.
> 
> In what way doesn't it follow the FastCGI standard ?

The way how a connection is initialized, using a socket, is part of the
specification. Providing a port isn't. See:

http://www.fastcgi.com/drupal/node/6?q=node/22#S3.2

> >> But mod_fastcgi additionally allows you to specify that the fastcgi process is
> >> already running, and that no process should be started. The process can run
> >> on the same or on another machine as the Webserver:
> >
> > What you described here is the FastCGI standard. This way the webserver
> > can scale up the amount of connections for each instance of the
> > cgi-process.
> 
> Can you show me how ?

These are standard options of mod_cgid?

http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#fcgididletimeout

And also look for fcgidmaxprocesses, fcgidmaxrequestsperprocess,
fcgidprocesslifetime

Also check this: 
http://www.fastcgi.com/drupal/node/6?q=node/22#S4.1

The FastCGI process should return how many connection and requests it
can handle. I'm not sure anymore if FastCGI of fpc can handle muliple
requests at a time. (It could, but some parts ahve been changed)

> >>    FastCgiExternalServer D:/counte/verbruik/server -host 127.0.0.1:2015 -idle-timeout 30 -flush
> >
> > You can configure mod_fcgid also this way, if you want. (Except for
> > debugging, I woudn't know why you would do that. And I use the embedded
> > webserver for debugging)
> 
> How ? I tried, but found no description of how to do this.

I tried to find it, but now I remember that I looked for this earlier
and coudn't find it. Probably because it isn't part of the FastCGI
standard. So, no, if you need a specified port, you have to stick with
mod_fastcgi.

> That's why I use mod_fastcgi, because the mod_fcgid doesn't offer an
> equivalent of FastCgiExternalServer.

Seems you're right.

> >> This is very convenient, because you can start the fastcgi process in the
> >> debugger, just as any normal process. Or, the fastCGI process can be a
> >> windows service.
> >
> > Hmm.. windows service could be an idea. But that scales not that easy,
> > offcourse.
> >
> >> Other than that, the configuration option names are different.
> >>
> >> My FastCGI process is running as a windows service.
> >
> > What is exactly the reason for this? Isn't it much easier when the
> > webserver starts (and stops, when it is not used) the cgi-application,
> > than doing this in a Windows service?
> 
> I want to control the amount of instances and the exact moment of their
> start/stop. I don't want the server to control my application instance.

Because you don't trust IIS? ;)

Joost.