Cache as a web service

This example shows Apache as the front-end (or "reverse proxy") for article-tree - it's assumed you've completed it first. Three steps to setting up Apache quickly:

Enable FastCGI proxy used to communicate with Golf services - this is one time only:
- If you use Ubuntu and similar:
```
sudo a2enmod proxy
sudo a2enmod proxy_fcgi
```
  Copied!
- If you use Fedora and similar:
```
sudo vi /etc/httpd/conf/httpd.conf
```
  Copied!
  and if you use OpenSUSE:
```
sudo vi /etc/httpd/conf/httpd.conf
```
  Copied!
  Add the following at the end of httpd.conf:
```
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so
```
  Copied!
Edit Apache configuration file:
- If you use Debian (such as Ubuntu):
```
sudo vi /etc/apache2/apache2.conf
```
  Copied!
- If you use Fedora (such as RedHat), Archlinux:
```
sudo vi /etc/httpd/conf/httpd.conf
```
  Copied!
- If you use OpenSUSE:
```
sudo vi /etc/apache2/httpd.conf
```
  Copied!
Add this to the end of the configuration file - note "tree" is the application name you created in the above example (replace "your-user" with your OS user name):
```
ProxyPass "/tree/" unix:///home/your-user/.golf/apps/tree/sock/.sock|fcgi://localhost/tree
```
Copied!
Restart Apache.
- On Debian systems (like Ubuntu) or OpenSUSE:
```
sudo systemctl restart apache2
```
  Copied!
- On Fedora systems (like RedHat) and Arch Linux:
```
sudo systemctl restart httpd
```
  Copied!

- Test web service

Now you can call your web service, from the web. In this case it's probably a local server (127.0.0.1) if you're doing this on your own computer. The URLs would be, for example to add, query and delete a key/value pair:

http://127.0.0.1/tree/srv/op=add/key=1/data=d_1

Copied!

http://127.0.0.1/tree/srv/op=query/key=1

Copied!

http://127.0.0.1/tree/srv/op=delete/key=1

Copied!

Note the URL request structure: first comes the application path ("/tree") followed by request path ("/srv") followed by URL parameters (such as "/op=add/key=1/data=d_1"). The result in web browser are messages informing you that the key was added, queried or deleted.