From 9b3549ab5bc6a154473e1b921b959a0cd3ee9a97 Mon Sep 17 00:00:00 2001
From: Craig Peterson <cpeterson@stackoverflow.com>
Date: Fri, 11 Sep 2015 10:53:29 -0600
Subject: [PATCH] Reverse proxies setting host header properly

---
 cmd/bosun/main.go    |  1 +
 cmd/bosun/web/web.go | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/cmd/bosun/main.go b/cmd/bosun/main.go
index 0025d64d64..293d5b0347 100644
--- a/cmd/bosun/main.go
+++ b/cmd/bosun/main.go
@@ -129,6 +129,7 @@ func main() {
 					w.WriteHeader(204)
 					return
 				}
+				r.Host = c.TSDBHost
 				rp.ServeHTTP(w, r)
 			}))
 			slog.Infoln("readonly relay at", ts.URL, "to", tsdbHost)
diff --git a/cmd/bosun/web/web.go b/cmd/bosun/web/web.go
index 3730ea60df..b8ecc1b3f4 100644
--- a/cmd/bosun/web/web.go
+++ b/cmd/bosun/web/web.go
@@ -124,6 +124,7 @@ func Listen(listenAddr string, devMode bool, tsdbHost string) error {
 
 type relayProxy struct {
 	*httputil.ReverseProxy
+	host string
 }
 
 type passthru struct {
@@ -153,6 +154,7 @@ func (rp *relayProxy) ServeHTTP(responseWriter http.ResponseWriter, r *http.Requ
 	}
 	reader := &passthru{ReadCloser: r.Body}
 	r.Body = reader
+	r.Host = rp.host
 	w := &relayWriter{ResponseWriter: responseWriter}
 	rp.ReverseProxy.ServeHTTP(w, r)
 	indexTSDB(r, reader.buf.Bytes())
@@ -163,10 +165,13 @@ func (rp *relayProxy) ServeHTTP(responseWriter http.ResponseWriter, r *http.Requ
 }
 
 func Relay(dest string) http.Handler {
-	return &relayProxy{ReverseProxy: httputil.NewSingleHostReverseProxy(&url.URL{
-		Scheme: "http",
-		Host:   dest,
-	})}
+	return &relayProxy{
+		ReverseProxy: httputil.NewSingleHostReverseProxy(&url.URL{
+			Scheme: "http",
+			Host:   dest,
+		}),
+		host: dest,
+	}
 }
 
 func indexTSDB(r *http.Request, body []byte) {