Title
Sharding and HTTP/2 connection reuse revisited: why are there still redundant connections?
Abstract
ABSTRACTHTTP/2 and HTTP/3 avoid concurrent connections but instead multiplex requests over a single connection. Besides enabling new features, this reduces overhead and enables fair bandwidth sharing. Redundant connections should hence be a story of the past with HTTP/2. However, they still exist, potentially hindering innovation and performance. Thus, we measure their spread and analyze their causes in this paper. We find that 36% - 72% of the 6.24 M HTTP Archive and 78% of the Alexa Top 100k websites cause Chromium-based webbrowsers to open superfluous connections. We mainly attribute these to domain sharding, despite HTTP/2 efforts to revert it, and DNS load balancing, but also the Fetch Standard.
Year
DOI
Venue
2021
10.1145/3487552.3487832
Internet Measurement Conference
DocType
Citations 
PageRank 
Conference
0
0.34
References 
Authors
0
4
Name
Order
Citations
PageRank
Constantin Sander121.39
Leo Blöcher200.34
Klaus Wehrle31062105.97
Jan Rüth45911.49