nginx does not respond correctly to HTTP/1.1

Question

I'm having an issue where certain clients that first try to connect via HTTP/1.1 are not correctly getting forwarded to HTTPS

curl -v http://indentationerror.com/
*   Trying 217.45.175.173:80...
* Connected to indentationerror.com (217.45.175.173) port 80 (#0)
> GET / HTTP/1.1
> Host: indentationerror.com
> User-Agent: curl/7.73.0
> Accept: */*
> 
* Received HTTP/0.9 when not allowed

* Closing connection 0
curl: (1) Received HTTP/0.9 when not allowed

However, with the command:

curl -v http://indentationerror.com/ --http2-prior-knowledge

nginx returns a 301 redirect as intended over HTTP/2

My config is currently:

server {
        server_name www.indentationerror.com;
        listen 443 ssl http2;
        listen [::]:443 ssl http2;
        ssl    on;
        root "/http/indentationerror.com/www";
        include /etc/nginx/genericHandlers/indentationerror.com;
}

server {
        server_name indentationerror.com;
        listen 443 ssl http2 default_server;
        listen [::]:443 ssl http2 default_server;
        ssl    on;
        root "/http/indentationerror.com/www";
        include /etc/nginx/genericHandlers/indentationerror.com;
}

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name $host;
        return 301 https://$host$request_uri;   
}

The broken part (added once I found the issue):

server {
    server_name api.indentationerror.com;
    listen 80 http2;
    listen [::]:80 http2;
    root "/http/indentationerror.com/api";

    include /etc/nginx/genericHandlers/indentationerror.com;
}

server {
    server_name api.indentationerror.com;
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    ssl    on;
    root "/http/indentationerror.com/api";
    include /etc/nginx/genericHandlers/indentationerror.com;

}

We think you have an additional `server` block you haven't disclosed and that the problem lies there. Please edit your question to include the output of `nginx -T`. — Michael Hampton, Nov 08 '20 at 05:42

score 11 · Accepted Answer · answered Nov 08 '20 at 15:35

I had an accidental "http2" directive on one of my port 80 server directives (you can see it in the "api" server). For some reason using this on one server block affects others. Thanks to Michael for the hint. For anyone else experiencing the issue, removing "http2" from all of your port 80 servers fixes the issue.

nginx does not respond correctly to HTTP/1.1

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