diff --git a/webseed/request.go b/webseed/request.go
index 6d62ccb6..4e3ef609 100644
--- a/webseed/request.go
+++ b/webseed/request.go
@@ -10,10 +10,12 @@ import (
 	"github.com/anacrolix/torrent/metainfo"
 )
 
-func trailingPath(infoName string, pathComps []string) string {
+// Escapes path name components suitable for appending to a webseed URL. This works for converting
+// S3 object keys to URLs too.
+func EscapePath(pathComps []string) string {
 	return path.Join(
 		func() (ret []string) {
-			for _, comp := range append([]string{infoName}, pathComps...) {
+			for _, comp := range pathComps {
 				ret = append(ret, url.QueryEscape(comp))
 			}
 			return
@@ -21,6 +23,10 @@ func trailingPath(infoName string, pathComps []string) string {
 	)
 }
 
+func trailingPath(infoName string, fileComps []string) string {
+	return EscapePath(append([]string{infoName}, fileComps...))
+}
+
 // Creates a request per BEP 19.
 func NewRequest(url_ string, fileIndex int, info *metainfo.Info, offset, length int64) (*http.Request, error) {
 	fileInfo := info.UpvertedFiles()[fileIndex]