> For the complete documentation index, see [llms.txt](https://docs.link11.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.link11.com/product-guides/web-ddos/interface/instances/http-settings.md).

# HTTP Settings

This section contains all settings concerning the HTTP connection for the selected instance.

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## **Origin Loadbalancing**

Enables Origin Loadbalancing: the distribution of traffic across multiple origin servers. If this is enabled, setup must be done in the [Load Balancing](/product-guides/web-ddos/interface/load-balancing.md) Section.

<figure><img src="/files/bMk8PLuFTxxz2AJRf4Yq" alt=""><figcaption></figcaption></figure>

When this is selected, the following option will be available:

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## **Choose Load Balancing Instance**

Select a load balancing site you wish to use as a load balancer for the selected WebDDoS instance.

<figure><img src="/files/TyX6H4bB5WadiTttOPE7" alt=""><figcaption></figcaption></figure>

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## **Origin Address**

Defines the address of the origin server for the selected instance.

<figure><img src="/files/cuYoPKv1uWszNn6k1YtE" alt=""><figcaption></figcaption></figure>

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## **Origin Timeouts**

Defines CONNECTION and READ timeouts for the origin (backend) server. Slower backend servers might need higher timeout limits.

<figure><img src="/files/WinI6Z8loHrawQQFgTy6" alt=""><figcaption></figcaption></figure>

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## **HTTP/2**

Enables the HTTP/2 Proxy for site visitors. Link11 will only speak HTTP/1 with the origins. When this is enabled, the system sends HTTP/2 requests to a translation proxy, which will send HTTP/1 to Link11, and this will be redirected to customers.

<figure><img src="/files/Kg3tls6zhiT2yPJNBqiC" alt=""><figcaption></figcaption></figure>

{% hint style="warning" %}
**Note:** The HTTP/2 proxy sits in front of the main Link11 web proxies. Inbound HTTP/2 requests to the customer origin will be terminated on this HTTP/2 proxy, and all ongoing communication (HTTP/2 proxy → web proxy → customer origin) will be done over HTTP/1. Responses back to the client will also leverage the HTTP/2 proxy, allowing clients to send and receive HTTP/2 traffic to and from Link11. **All communication with customer origins will be done over HTTP/1.**
{% endhint %}

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## **Keepalive**

Enabling this will give HTTP requests a keepalive limit. Otherwise, all requests get forwarded until the connection is closed by a close header in the HTTP packet.

<figure><img src="/files/ltJUL7QPaYnHBGcRSzoq" alt=""><figcaption></figcaption></figure>

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## **Keepalive Limit**

Sets a numeric keepalive limit for requests made by one connection.

<figure><img src="/files/wXGMIcdTsXbAtdSTS7uD" alt=""><figcaption></figcaption></figure>

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## **Forward-For Header**

Sets a header which includes the client's real IP (as opposed to the Link11 proxy IP).\
Link11 mostly uses the X-DDOSPROXY header.

<figure><img src="/files/rQ2EW5sfXlRRSgmzYhY9" alt=""><figcaption></figcaption></figure>

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## **Max POST Size**

Sets the Maximum HTTP POST Size (in megabytes) from clients during regular operation mode.&#x20;

Be aware that if you are using [Secure CDN](/product-guides/secure-cdn.md) on the same domain, there is a [separate setting for Max File Upload Size](/product-guides/secure-cdn/interface/instances.md#max-file-upload-size) (within WebGUI, navigate to the CDN [Instances](https://webgui.link11.com/?p=cdn\&a=sites), then select Edit for the appropriate Location) that needs to be equally adjusted for the file upload to work.

<figure><img src="/files/XQmy1Yc2VpWTf0D3Zdhg" alt=""><figcaption></figcaption></figure>

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## **Error Pages**

Enables admins to upload custom HTTP Error Page designs. Available for HTTP Error 504 (Gateway Timeout), 400 (Bad Request) and 403 (Forbidden).

<figure><img src="/files/Dsaad8LfblZkIr18QxKf" alt=""><figcaption></figcaption></figure>

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## **Maintenance Mode**

Lets admins put the selected WebDDoS instance into Maintenance Mode. The DDoS Proxy will return an HTTP 503 error page. No traffic will be forwarded to the source.

<figure><img src="/files/dJ40delMzPtOWgJjSGvX" alt=""><figcaption></figcaption></figure>

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## **Maintenance Page**

Enables admins to upload a custom Maintenance Page design. Will be displayed if WebDDoS Instance goes into [Maintenance Mode](#maintenance-mode).

<figure><img src="/files/q8OmeJTHOevx7eqgOESe" alt=""><figcaption></figcaption></figure>