In the span streaming path, URL-related attributes (url.full, url.query, url.fragment) are collected in a local attributes dict but only set on the span via set_attributes() at line 103, after real_send() completes. If real_send() raises an exception, these attributes are never set on the span. In contrast, the legacy path sets these attributes (lines 119-123) before calling real_send() (line 141), ensuring URL context is preserved even on failed requests.