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Hello world example
===================
The simplest "Hello World" example using fcl-web (fpweb) that uses a web action
called "func1call" in the web module to generate the response page.
Note that the only difference between CGI/FCGI and Apache module is in the
main project .lpr file and the web server (Apache) configuration.
=====================
1. Compiling
1.a; with FPC
1.b; with Lazarus
2. Setup
2.a; as CGI
2.b; as Apache module
2.c; as FCGI
=====================
1. Compiling:
-------------
We can either use FPC directly, or Lazarus to compile the CGI/FCGI/Apache
module application. The main project .lpr file, as well as the Lazarus .lpi is
in the cgi/fcgi/apache directories.
1.a; with FPC
-------------
Go to the directory (cgi/fcgi/apache) that has the .lpr file you wish to
compile, and then execute the command
fpc -Fu../webmodule helloworld.lpr
The -Fu parameter shows FPC where to find the web module source code. All
three web applications share the same web module code.
1.b; with Lazarus
-----------------
It needs the WebLaz Package installed. Open the .lpi file from the choosen
application directory (cgi/fcgi/apache), and then
Run -> Build from the menu.
2. Setup:
---------
2.a; as CGI
-----------
http://<WebServer>/cgi-bin/<CGIExecutableName>/func1call should start the
example if everything is set up properly.
ex: http://127.0.0.1:8080/cgi-bin/helloworld.exe/func1call
Note: You need to change the URL if "cgi-bin" or "helloworld.exe" changes
(for example on Linux it is not helloworld.exe).
Also, if your server is listening on port 80 instead of 8080, you can leave
the :8080 part from the calling URL.
2.b; as Apache module
---------------------
http://<WebServer>/<ApacheLocationName>/func1call should start the
example if everything is set up properly.
ex: http://127.0.0.1:8080/myapache/func1call
Example Apache configuration file (e.g. httpd.conf) snippet for this:
LoadModule mod_helloworld "<path_to_mod>/helloworld.dll"
<Location /myapache>
SetHandler mod_helloworld
Order allow,deny
Allow from all
</Location>
Note: You need to change the URL if "myapache" changes.
Also, for example on Linux the module can be libhelloworld.so and not
helloworld.dll
Note: If you recompile an apache module while the module itself is loaded into
the Apache server, the compilation might fail because the file is in use
(Apache modules stay in the memory). So first, you always need to stop the
server before you recompile or before you copy over the new version of the
newly created module.
On Linux, it is enough to simply reload Apache after recompile.
2.c; as FCGI
------------
http://<WebServer>/<ApacheScriptAliasName>/func1call should start the example
if everything is set up properly.
ex: http://127.0.0.1:8080/myfcgi/func1call
Example Apache configuration file (e.g. httpd.conf) snippet for this:
LoadModule fastcgi_module "<path_to_mod>/mod_fastcgi-2.4.6-AP22.dll"
<IfModule mod_fastcgi.c>
<Directory "<path_to_fcgi_app>">
# Options +ExecCGI <- not needed if ScriptAlias is used below
Order allow,deny
Allow from all
</Directory>
#External FCGI app, has to start manually, Apache will not do it
FastCgiExternalServer "<path_to_fcgi_app>/helloworld.exe" -host 127.0.0.1:2015 -idle-timeout 30 -flush
#optionally, to shorten the calling URL and to not display the executable file name (if used, no +ExecCGI is needed above)
ScriptAlias /myfcgi "<path_to_fcgi_app>/helloworld.exe"
</IfModule>
Note: You need to change the module name if needed. For example on Linux,
the module is not mod_fastcgi-2.4.6-AP22.dll but mod_fastcgi.so (need to be
compiled from sources found at http://www.fastcgi.com/dist/ ).
The port (2015 in this example) must match the one set in the project main
file (helloworld.lpr).
The FCGI application must be running in order for this demo to work (external
FCGI server setup). Do not forget to restart it after changes and
recompilation.
Also, mod_fastcgi is not the same as mod_fcgid that the Apache project is
developing. The latter does not support external FCGI server apps.
There are other ways than external FCGI server apps to handle the FCGI
protocol and both mod_fastcgi and mod_fcgid supports that. However, external
FCGI servers are the best for debugging and development, that is why the
examples do it that way.
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