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7 changes: 7 additions & 0 deletions packages/cli/src/serve/proxy.rs
Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,13 @@ pub(crate) fn proxy_to(

let uri = req.uri().clone();

// Set X-Forwarded-Host for backend if an upstream proxy has not already set it.
if !req.headers().contains_key("x-forwarded-host") {
if let Some(host) = req.headers().get(HOST).cloned() {
req.headers_mut().insert("x-forwarded-host", host);
}
}

// Set Host header for backend (send_with_retry handles TCP connection via url)
if let Some(authority) = url.authority() {
req.headers_mut().insert(
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