What is difference between ZUUL and Spring Cloud gateway?

The ZUUL is a server application which is running on the same server as the gateway.

ZUUL has the sole responsibility to intercept the requests coming from the browser and then forward them to the gateway. The gateway is an application which sits on top of an application server and processes the request and returns the response to the browser. ZUUL is a proxy server which sits in front of the gateway and forwards the requests to the gateway. The ZUUL is a spring based application.

Is Spring cloud gateway an API gateway?

I have read the documentation and found a couple of things which are confusing for me.

This documentation is about Spring Cloud Gateway. But I think it is not describing Spring Cloud Gateway as an API gateway.

It says: "Gateway-based integration for microservices, event-driven architectures, or any other app that uses HTTP endpoints". I understand the concept of the documentation. But is Spring cloud gateway is a gateway as I have understood it, or does it have to work as an API gateway? You can see this blog post to get a better understanding. The core of the solution is the use of a custom gateway and not the spring cloud gateway. If you go to the spring cloud gateway documentation you can find more about how it works.

What is the difference between Kong API Gateway and Apisix?

Apisix is a cloud service for managing APIs.

With Apisix you can easily create, publish and maintain an API using their graphical web interface.

Kong is an open source platform that implements the Apache Traffic Server WebSocket protocol. It is designed to be flexible and easy to use.

Is it easy to migrate from Kong API Gateway to Apisix? Not at all. Kong does not come with any migration tool. Apisix has a very good API management tool.

Kong will give me the maximum flexibility. If I need to make any changes in the future to an API, I will just need to make sure that I have the latest version of Kong.

Do I need a separate database for storing my API calls? If you have a MySQL or Postgres database, you don't need to add any database. Kong will use the database you already have.

Kong allows me to have my own API endpoints. What is the difference between this and a REST API? A REST API is usually used to expose an API endpoint that your users can access by making HTTP requests. This means that all your REST API endpoints are hosted on Kong. With Kong API Gateway, you can also add your own API endpoints that are hosted on another service like Amazon Lambda.

What about adding custom methods to an API? With Kong API Gateway, you don't need to add any additional methods to your API. Kong will add them for you. For example, when an API receives a request to delete an object, you don't need to implement a separate method for deleting objects.

How do I use HTTPS with Kong API Gateway? By default, Kong is configured to use HTTPs for the entire Kong API gateway. You can add the domain as a secure domain to enable the same for each individual domain.

How do I add new API endpoints? By default, Kong comes with out-of-the-box support for Swagger, OpenAPI and other static documentation generators. Kong API Gateway can additional custom documentation generators as well.

Why do I need a separate DNS entry for an API Gateway? Kong API Gateway allows you to have multiple DNS entries.