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What is host header override?
You can override the Host header being sent to your origin by specifying the domain name of your override Host on the Settings page for a specific service or by specifying a host on the Origins page for a specific Host.
What are IIS host headers?
Host headers enable you to publish multiple domain names or websites to a single IP address. This allows a web administrator to run several sites on a single IP. It also allows a single website to have multiple names resolve for it, such as website1.com and www.website1.com.
Can a host named site collection use alternate access mappings?
Host-named site collections can’t use alternate access mappings. Host-named site collections are automatically considered in the Default zone, and the URL of the request must not be changed between the user and the server. Multiple internal URLs can be associated with a single public URL.
When to use alternate access mappings in SharePoint?
Host Header site collections are a mechanism to allow you to map different host headers to individual site collections within the same SharePoint web application. The purpose of alternate access mappings is to deal with the situation where you have a load balancer or a proxy server that translates from an external URL to your server’s internal URL.
When do you add a host header to a website?
You would normally do that to support different security, authentication and URLs between an Internet site, Intranet and Extranet, for example. When you add a host header it is equivalent to going to IIS and modifying the HTTP bindings for a site, and adding another URL or port.
This ensures that the relative URLs generated by SharePoint when rendering pages are consistent with the external URL. Configuring alternate access mappings does not automatically add host header entries.