What does ERR_SPDY_PROTOCOL_ERROR mean in nginx?

nginx spdy
TheMrbikus picture TheMrbikus · Nov 23, 2015 · Viewed 61.8k times · Source

I and a few of my colleagues got the net::ERR_SPDY_PROTOCOL_ERROR error.

We use ngnix version 1.8.0. The error is not stable (hard to replicate), and the Ngnix error log doesn't have this error.

How would you advise we catch and resolve this?

Answer

CharlesA picture CharlesA · Aug 28, 2018

I came across this question when trying to find help for the problem I was facing with ERR_SPDY_PROTOCOL_ERROR on Chrome. Thought this might benefit others.

Our situation / solution: We use an AWS Application Load Balancer connected to EC2 instances. One of the scripts we run on EC2 proxies requests from the client browser. We recently updated the script - no relevant changes - and noticed that both Chrome and Safari requests to the proxy script started failing. Chrome showed the ERR_SPDY_PROTOCOL_ERROR error and, when we dug in to it, we could see this request was using HTTP/2. Firefox requests continued to work fine.

Our solution: we switched off HTTP/2 support in the ALB. Immediately solved the problem.

AWS CLI command:

aws elbv2 modify-load-balancer-attributes --load-balancer-arn <your_load_balancer_arn> --attributes Key=routing.http2.enabled,Value=false

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