HTTP headers
Host HTTP Header Meaning
Host names the authority the client wants to reach.
Meaning
The request identifies the target host and optional port.
Where it appears
HTTP/1.1 requests require it so servers and proxies can route virtual hosts.
What to check
Check virtual host routing, proxy forwarding, and whether untrusted Host values can affect generated URLs.
Example
Host: example.comReferences
- Registry
- IANA HTTP Field Name Registry
- Guide
- MDN Host