fix(file_server): don't crash on "%" pathname (#3953)

1 files changed, 9 insertions, 3 deletions

diff --git a/std/http/file_server.ts b/std/http/file_server.ts
index acf272764..d71b9ad53 100755
--- a/std/http/file_server.ts
+++ b/std/http/file_server.ts
@@ -301,9 +301,15 @@ function html(strings: TemplateStringsArray, ...values: unknown[]): string {
 listenAndServe(
   addr,
   async (req): Promise<void> => {
-    const normalizedUrl = posix.normalize(req.url);
-    const decodedUrl = decodeURIComponent(normalizedUrl);
-    const fsPath = posix.join(target, decodedUrl);
+    let normalizedUrl = posix.normalize(req.url);
+    try {
+      normalizedUrl = decodeURIComponent(normalizedUrl);
+    } catch (e) {
+      if (!(e instanceof URIError)) {
+        throw e;
+      }
+    }
+    const fsPath = posix.join(target, normalizedUrl);
 
     let response: Response;
     try {