2026-10-19: FidEx and Wayback QA, Two Tools That Assist With Identifying Why A Resource Failed To Load During Replay
Figure 1: Web archiving process augmented with FidEx. Figure from https://www.usenix.org/system/files/nsdi26-zhu-jingyuan.pdf . To improve the annotation feature for our web archiving livestreams , I have been looking at different Quality Assurance tools that detect replay problems and explain why specific resources fail to load. Most of the Quality Assurance tools that determine the quality of the archived web page do not specify the reason why each web resource failed to load. Zhu et al.’s FidEx tool and Archive-It's Wayback QA tool try to assist with this problem. Zhu, Sun, and Madhyastha’s paper " Detecting and Diagnosing Errors in Serving Archived Web Pages " describes their approach (Figure 1) for detecting problems with replay quality that are caused by rewriting errors made by the replay system. Their approach involves comparing the layout trees ( HTML DOM [Document Object Model] and CSSOM [CSS Object Model]) and the JavaScript writes for the live and archi...