400 bad request-The plain http request was sent to https port nginx

Question

I've created an ingress rule for my cluster but when I go to the port and try to open it, I get the following error:

Answer 1

You encounter this error because every time a client tries to access your site via HTTP, the request is redirected to HTTPS. It’s because the nginx expects SSL to be used in the transaction yet the original request was plain HTTP, it complains with the error.

In you nginx config file comment the the following line

#ssl on

Comments

I am using openshift 4.3 and I have created route with target port 443. In my nginx I have something like this

server {

   
    listen       8080;
    
    <% if ENV["HTTPS__ENABLED"] == "true" %>
    listen <%= ENV["HTTPS__PORT"] %> ssl;
    # These files are generated by the node app
    ssl_certificate /cert.csr;
    ssl_certificate_key /tls_private_key.csr;
    ssl_protocols TLSv1.2;
    <% end %>
    server_name <%= ENV["DEFAULT_SERVICE_NAME"].sub("https://", "") || localhost %>;

I get this error
 

400 Bad Request

The plain HTTP request was sent to HTTPS port

---

Did you expose your Pod?

Answer 2

You usually get this error when you try to configure you Nginx to handle both HTTP and HTTPS requests. 

To fix this error, comment out the line below in your configuration or set it to off.

#ssl on 
OR
ssl off

Save and close the file. Then restart the nginx service.

# systemctl restart nginx
OR
$ sudo systemctl restart nginx

Answer 3

If you check your config file, it says "listen to port 80"(HTTP) and "SSL on". When you point your browser to http://localhost, it tries to connect via HTTP but since you have mentioned SSL it expects to use SSL. 

What you can do is have two separate servers, something like this:

server {
  listen 80;

  // other directives...
}

server {
  listen 443;

  ssl on;
  // SSL directives...

  // other directives...
}