From ed11eab0a7f610a8eb4b039c08bd436d6355c42e Mon Sep 17 00:00:00 2001
From: Muki Kiboigo <muki@muki.gg>
Date: Thu, 11 Sep 2025 21:19:19 -0700
Subject: [PATCH] use content length to reserve body size

---
 src/browser/fetch/fetch.zig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/browser/fetch/fetch.zig b/src/browser/fetch/fetch.zig
index c59e75d0..01ec1040 100644
--- a/src/browser/fetch/fetch.zig
+++ b/src/browser/fetch/fetch.zig
@@ -172,6 +172,10 @@ pub fn fetch(input: RequestInput, options: ?RequestInit, page: *Page) !Env.Promi
                     };
                 }
 
+                if (transfer.getContentLength()) |cl| {
+                    try self.body.ensureTotalCapacity(self.arena, cl);
+                }
+
                 var it = transfer.responseHeaderIterator();
                 while (it.next()) |hdr| {
                     const joined = try std.fmt.allocPrint(self.arena, "{s}: {s}", .{ hdr.name, hdr.value });