diff --git a/cmd/imageproxy/main.go b/cmd/imageproxy/main.go
index 2c9ce5d..7bf3f55 100644
--- a/cmd/imageproxy/main.go
+++ b/cmd/imageproxy/main.go
@@ -39,6 +39,7 @@ var referrers = flag.String("referrers", "", "comma separated list of allowed re
 var includeReferer = flag.Bool("includeReferer", false, "include referer header in remote requests")
 var followRedirects = flag.Bool("followRedirects", true, "follow redirects")
 var baseURL = flag.String("baseURL", "", "default base URL for relative remote URLs")
+var passRequestHeaders = flag.String("passRequestHeaders", "", "comma separatetd list of request headers to pass to remote server")
 var cache tieredCache
 var signatureKeys signatureKeyList
 var scaleUp = flag.Bool("scaleUp", false, "allow images to scale beyond their original dimensions")
@@ -70,6 +71,9 @@ func main() {
 	if *contentTypes != "" {
 		p.ContentTypes = strings.Split(*contentTypes, ",")
 	}
+	if *passRequestHeaders != "" {
+		p.PassRequestHeaders = strings.Split(*passRequestHeaders, ",")
+	}
 	p.SignatureKeys = signatureKeys
 	if *baseURL != "" {
 		var err error
diff --git a/imageproxy.go b/imageproxy.go
index 8a37a56..02c07e8 100644
--- a/imageproxy.go
+++ b/imageproxy.go
@@ -85,6 +85,10 @@ type Proxy struct {
 
 	// The User-Agent used by imageproxy when requesting origin image
 	UserAgent string
+
+	// PassRequestHeaders identifies HTTP headers to pass from inbound
+	// requests to the proxied server.
+	PassRequestHeaders []string
 }
 
 // NewProxy constructs a new proxy.  The provided http RoundTripper will be
@@ -179,6 +183,9 @@ func (p *Proxy) serveImage(w http.ResponseWriter, r *http.Request) {
 		// pass along the referer header from the original request
 		copyHeader(actualReq.Header, r.Header, "referer")
 	}
+	if len(p.PassRequestHeaders) != 0 {
+		copyHeader(actualReq.Header, r.Header, p.PassRequestHeaders...)
+	}
 	if p.FollowRedirects {
 		// FollowRedirects is true (default), ensure that the redirected host is allowed
 		p.Client.CheckRedirect = func(newreq *http.Request, via []*http.Request) error {