canonicalize header keys

config/http_headers.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"fmt"
+	"net/http"
 
 	"golang.ngrok.com/ngrok/internal/pb"
 )
@@ -77,27 +78,27 @@ func WithHostHeaderRewrite(rewrite bool) HTTPEndpointOption {
 // WithRequestHeader adds a header to all requests to this edge.
 func WithRequestHeader(name, value string) HTTPEndpointOption {
 	return requestHeaders(headers{
-		Added: map[string]string{name: value},
+		Added: map[string]string{http.CanonicalHeaderKey(name): value},
 	})
 }
 
 // WithRequestHeader adds a header to all responses coming from this edge.
 func WithResponseHeader(name, value string) HTTPEndpointOption {
 	return responseHeaders(headers{
-		Added: map[string]string{name: value},
+		Added: map[string]string{http.CanonicalHeaderKey(name): value},
 	})
 }
 
 // WithRemoveRequestHeader removes a header from requests to this edge.
 func WithRemoveRequestHeader(name string) HTTPEndpointOption {
 	return requestHeaders(headers{
-		Removed: []string{name},
+		Removed: []string{http.CanonicalHeaderKey(name)},
 	})
 }
 
 // WithRemoveResponseHeader removes a header from responses from this edge.
 func WithRemoveResponseHeader(name string) HTTPEndpointOption {
 	return responseHeaders(headers{
-		Removed: []string{name},
+		Removed: []string{http.CanonicalHeaderKey(name)},
 	})
 }