diff --git a/src/main.zig b/src/main.zig
index bbccf09..36e3672 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -803,10 +803,11 @@ fn findHeader(headers: []const u8, name: []const u8) ?[]const u8 {
 }
 
 fn httpRespond(stream: std.net.Stream, status: []const u8, content_type: []const u8, body: []const u8) void {
-    var buf: [4096]u8 = undefined;
-    // include Server header for relay loop detection (Go relay: "indigo-relay (atproto-relay)")
-    const response = std.fmt.bufPrint(&buf, "HTTP/1.1 {s}\r\nContent-Type: {s}\r\nContent-Length: {d}\r\nServer: zlay (atproto-relay)\r\nConnection: close\r\n\r\n{s}", .{ status, content_type, body.len, body }) catch return;
-    _ = stream.write(response) catch {};
+    // write headers first, then body separately (body can be much larger than header buffer)
+    var hdr_buf: [512]u8 = undefined;
+    const hdr = std.fmt.bufPrint(&hdr_buf, "HTTP/1.1 {s}\r\nContent-Type: {s}\r\nContent-Length: {d}\r\nServer: zlay (atproto-relay)\r\nConnection: close\r\n\r\n", .{ status, content_type, body.len }) catch return;
+    _ = stream.write(hdr) catch return;
+    _ = stream.write(body) catch {};
 }
 
 fn parseEnvInt(comptime T: type, key: []const u8, default: T) T {