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Req Hostname

_includes/api/en/5x/req-hostname.md

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<h3 id='req.hostname'>req.hostname</h3>

Contains the hostname derived from the Host HTTP header.

When the trust proxy setting does not evaluate to false, this property will instead get the value from the X-Forwarded-Host header field. This header can be set by the client or by the proxy.

If there is more than one X-Forwarded-Host header in the request, the value of the first header is used. This includes a single header with comma-separated values, in which the first value is used.

<div class="doc-box doc-info" markdown="1"> Prior to Express v4.17.0, the `X-Forwarded-Host` could not contain multiple values or be present more than once. </div>
js
// Host: "example.com:3000"
console.dir(req.hostname)
// => 'example.com'