Add HAProxy Config to reverse-proxies.en-us.md (#17407)

* Update reverse-proxies.en-us.md

Addition of HAProxy

* Update reverse-proxies.en-us.md
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@ -292,3 +292,50 @@ If you wish to run Gitea with IIS. You will need to setup IIS with URL Rewrite a
</system.webServer>
</configuration>
```
## HAProxy
If you want HAProxy to serve your Gitea instance, you can add the following to your HAProxy configuration
add an acl in the frontend section to redirect calls to gitea.example.com to the correct backend
```
frontend http-in
...
acl acl_gitea hdr(host) -i gitea.example.com
use_backend gitea if acl_gitea
...
```
add the previously defined backend section
```
backend gitea
server localhost:3000 check
```
If you redirect the http content to https, the configuration work the same way, just remember that the connexion between HAProxy and Gitea will be done via http so you do not have to enable https in Gitea's configuration.
## HAProxy with a sub-path
In case you already have a site, and you want Gitea to share the domain name, you can setup HAProxy to serve Gitea under a sub-path by adding the following to you HAProxy configuration:
```
frontend http-in
...
acl acl_gitea path_beg /gitea
use_backend gitea if acl_gitea
...
```
With that configuration http://example.com/gitea/ will redirect to your Gitea instance.
then for the backend section
```
backend gitea
http-request replace-path /gitea\/?(.*) \/\1
server localhost:3000 check
```
The added http-request will automatically add a trailing slash if needed and internally remove /gitea from the path to allow it to work correctly with Gitea by setting properly http://example.com/gitea as the root.
Then you **MUST** set something like `[server] ROOT_URL = http://example.com/gitea/` correctly in your configuration.