fix: update peer (#51)

diff --git a/src/trace/interceptors/fetch.ts b/src/trace/interceptors/fetch.ts
index 1936302..aca37a1 100644
--- a/src/trace/interceptors/fetch.ts
+++ b/src/trace/interceptors/fetch.ts
@@ -96,7 +96,7 @@
           isError: result.status === 0 || result.status >= 400, // when requests failed, the status is 0
           parentSpanId: segment.spans.length - 1,
           componentId: ComponentId,
-          peer: result.url.host,
+          peer: url.host,
           tags: options.detailMode
             ? [
                 {