@calvinleung

Calvin Leung

@calvinleungSingaporeJoined September 2026

Sharing experience of real-world cloud operations

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CLCalvin Leungcalvinleung.hashnode.dev6d ago · 3 min read

How a Duplicate `proxy_set_header Host` Caused an Nginx 400 Bad Request

I recently hit an Nginx 400 Bad Request while routing selected production traffic to a pre-production backend. The setup was roughly: Client | v CDN / Load Balancer | v Production Nginx |

CLCalvin Leungcalvinleung.hashnode.devSep 29 · 2 min read

Alibaba Cloud ApsaraVideo Live RTC Callback TroubleShooting

We have a project using AliCloud ApsaraVideo Live, today I was asked to create Stag/PreProd/Prod application as the kdemo application created for testing earlier. After created the new applications,

Calvin Leung

About

Available for

Calvin Leung's blogs

Recently published

How a Duplicate `proxy_set_header Host` Caused an Nginx 400 Bad Request

Alibaba Cloud ApsaraVideo Live RTC Callback TroubleShooting

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Calvin Leung

About

Available for

Calvin Leung's blogs

Recently published

How a Duplicate `proxy_set_header Host` Caused an Nginx 400 Bad Request

Alibaba Cloud ApsaraVideo Live RTC Callback TroubleShooting