Requests

HTTP request sent to HTTPS port link

What’s happening

When you send a request to a backing destination through Gloo Gateway, you get a 400 Bad Request response with a message similar to the following.

  The plain HTTP request was sent to HTTPS port
  

Why it’s happening

You have a basic example with an HTTP listener on the gateway. However, you also have an Istio integration that enables mTLS, which sends the HTTP traffic to the HTTPS port.

In your Helm installation, you might have the following settings:

  
global:
  istioIntegration:
    enableAutoMtls: true
    enabled: true
  

How to fix it

Choose from the following options:

• Set up an HTTPS listener and send the request to an HTTPS endpoint instead.
• Disable the auto mTLS setting for the Upstream of your backing destination. This way, you can continue to send requests to the HTTP endpoint and receive a response.