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Jun 2022
36m 10s

When CSS loads last - HTTP Request Prior...

Hussein Nasser
About this episode
In this episode of the backend engineering show I go through the Extensible Prioritization Scheme for HTTP. This RFC addresses the problem in HTTP where the client prefers certain requests to be served before others. This RFC was designed by Lucas Pardue from Cloudflare and Kazoo Oku from Fastly.   0:00 The Request Priority Problem  13:00 How RFC 9218 addres ... Show More
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CPU and Kernel Page Faults
<p>Page faults occurs when the process tries to access a memory that isn’t backed by a physical page kernel raises a fault which loads a page. It happens on first access, stack expansion, COW, swap and much more. However it comes with a cost. </p><p><br /></p><p>In this episode o ... Show More
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Amazon US-EAST-1 Outage in Details
On October 19 2025 AWS experienced an outage that lasted over a day, 10 days later we finally got the root cause analysis and we know exactly what caused the DNS to fail0:00 Summary 5:30 How did Dynamo lost its DNS?13:41 EC2 Errors 16:16 Network Load Balancer ErrorsRCA here https ... Show More
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There are cases where the backend may need to close the connection to prevent unexpected situations, prevent bad actors or simply just free up resources. Closing a connection gracefully allows clients and backends to clean up and finish any pending requests. In this episode of th ... Show More
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