Add query_string to HTTP replacer and use it for try_files

modules/caddyhttp/fileserver/caddyfile.go

@@ -17,9 +17,9 @@ package fileserver
 import (
 	"encoding/json"
 
-	"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
 	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
+	"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
 )
 
 func init() {
@@ -99,7 +99,7 @@ func parseTryFiles(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error)
 	}
 
 	handler := rewrite.Rewrite{
-		URI: "{http.matchers.file.relative}{http.request.uri.query}",
+		URI: "{http.matchers.file.relative}{http.request.uri.query_string}",
 	}
 
 	matcherSet := map[string]json.RawMessage{

modules/caddyhttp/replacer.go

@@ -89,6 +89,12 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon
 				return dir, true
 			case "http.request.uri.query":
 				return req.URL.RawQuery, true
+			case "http.request.uri.query_string":
+				qs := req.URL.Query().Encode()
+				if qs != "" {
+					qs = "?" + qs
+				}
+				return qs, true
 			}
 
 			// hostname labels