> For the complete documentation index, see [llms.txt](https://server-side.docs.sirdata.net/sirdata-server-side/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://server-side.docs.sirdata.net/sirdata-server-side/english-1/installation/data-processing/hosting-only.md).

# Hosting Only

sGTM Hosting Service without activating the GTM Helper processing layer

For the purposes of the service, the client instructs Sirdata to modify the headers of incoming HTTP requests to add additional parameters, specifically : 

<table><thead><tr><th width="210">Header</th><th width="193">Definition</th><th width="247">Possible Values</th><th>Example</th></tr></thead><tbody><tr><td>X-Appengine-City</td><td>User's Connection City</td><td>string</td><td>Paris</td></tr><tr><td>X-Appengine-Country</td><td>User's Connection Country</td><td>ISO 3166-1 alpha-2 country code</td><td>FR</td></tr><tr><td>X-Appengine-Region</td><td>User's Connection Region</td><td>ISO 3166-2 region code</td><td>IDF</td></tr><tr><td>X-Appengine-User-Ip</td><td>User's Connection IP Address</td><td>Adresse IP</td><td>1.1.1.1</td></tr></tbody></table>

To support the service, the client instructs Sirdata to modify the headers of incoming HTTP requests to remove or replace HTTP request headers when necessary, particularly (an asterisk "\*" indicates any string starting with the preceding characters):

* **X-Forwarded-For** : a comma-separated list of IP addresses, including the IP address of the request's origin and those through which the HTTP request was routed
* **X-Forwarded-Proto** : displays "http" or "https" depending on the protocol used by the client to connect to your application
* **X-**\*
* **Bunny**\*
* **Via**
* **Accept-Encoding**
* **Connection**
* **Keep-Alive**
* **Proxy-Authorization**
* **TE**
* **Trailer**
* **Transfer-Encoding**

To support the service, the client instructs Sirdata to modify the response headers for HTTP requests to add, remove, or replace parameters when necessary, particularly :

* **Cache-Control, Pragma, Expires, and Vary (**&#x73;pecify caching strategies)
* **Connection**
* **Content-Encoding (**&#x63;ompression used for the response, if any)
* **Content-Length**
* **Keep-Alive**
* **Proxy-Authenticate**
* **Server**
* **Alt-Svc**
* **Via**
* **Trailer**
* **Transfer-Encoding**
* **Upgrade**
* **Etag**
* **Age**