> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/glossary/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/glossary/b/back-to-origin-host-header.md).

# Back-to-origin Host Header

Back-to-origin host header is a feature used to modify the Host header in HTTP requests sent from the edge server to the origin server. It allows the accelerator to send requests to the origin server using a different host header than the one originally used by the client. This can be useful in scenarios where the origin server needs to be accessed using a different hostname or IP address than the one used by the client. By modifying the Host header, the accelerator can ensure that the requests are properly routed to the origin server.


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