From b84b000e790b5877934eaef3dcc87249d6b66f9d Mon Sep 17 00:00:00 2001
From: Matt Robenolt <matt@ydekproductions.com>
Date: Thu, 8 Feb 2024 15:01:30 -0800
Subject: [PATCH] Replace a Header.Get call with getHeaderCanonical (#682)

This is the only one I see left, and this is one is in the hot path for
every request.
---
 duplex_http_call.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/duplex_http_call.go b/duplex_http_call.go
index 80f5f2e4..2cee4cf2 100644
--- a/duplex_http_call.go
+++ b/duplex_http_call.go
@@ -290,7 +290,7 @@ func (d *duplexHTTPCall) makeRequest() {
 	defer close(d.responseReady)
 
 	// Promote the header Host to the request object.
-	if host := d.request.Header.Get(headerHost); len(host) > 0 {
+	if host := getHeaderCanonical(d.request.Header, headerHost); len(host) > 0 {
 		d.request.Host = host
 	}
 	if d.onRequestSend != nil {