Why HTTP/2 Server Push Isn’t a Silver Bullet and How to Use It Effectively
HTTP/2 introduced server push to let servers proactively send resources, but it suffers from issues such as cache invalidation after connection closure, difficulty identifying needed pages, lack of authentication reuse, and other pitfalls, so understanding its traps and best practices is essential for effective use.
It is well known that before HTTP/2, the HTTP protocol was unidirectional: only the client could initiate requests to the server, and the server could not push data to the client.
HTTP/2 adds a server‑push feature to address this limitation, but the feature also has several problems, such as:
The push cache becomes invalid immediately after the connection is closed.
The server cannot determine which page needs the corresponding data.
Unauthenticated requests cannot reuse existing connections.
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Server push in HTTP/2 is not a silver bullet; to use it well, read the original article to learn about its pitfalls and best practices.
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