#Angular access control allow origin how to
#Angular access control allow origin code
#Angular access control allow origin password

This introduces security issues in that any website can request data from an API. The web pages and APIs are often in different domains. Import else if (error.status = 401 || error.Many websites have JavaScript functions that make network requests to a server, such as a REST API. Next, it would be the login component Angular code: Then there are two buttons, one to log into the secure page. The other input field is for entering the password. All you need to know is that this page has two input fields, the first one allows users to enter the user name. So I will not waste time explaining them here.

#Angular access control allow origin password

User Name Required Password Required Login Clear īesides the basic Angular stuff in this, I wired the HTML form with some input validations, it deserves its own tutorial. First, I will show you the easiest of all three, the HTML mark up:

#Angular access control allow origin code

I break the login page functionality into three different related components, the HTML page mark up, the code logic for the login component, and the code logic for services needed. Since I decided to use Angular instead of the usual AngularJS, all these client end codes are hosted within its own little project. It has a login page, an index page that display some data, and a log out functionality that kicks the user back to the login page. I will explain in detail how browser works with CORS configuration, what problem I have faced, and how the solution works. The second part of the tutorial will be discussing the CORS configuration in the service API end. The first part will be extensive discussion on the front end design, how it communicates with the back end. If you need additional help understanding the back end web application, please check this prior tutorial. This is the tutorial I have created a while ago, which is the basis of this sample application. This means that after logging in, every request from user must have the JWT token added, or the request will be rejected.

On the server side, I have an OncePerRequestFilter that will check the JWT token, and authenticate/authorize the request. The login security will be controlled by a mock JWT token. I decided to use one of my other tutorials as basis. I wrote the front end with Angular, and it is very hard to use the normal session based security to work. All three require CORS checks for the two sides to communicate. The last one is the log out functionality. This is done by an API call to the back end, retrieving the data and displaying them on the page. The next one is that once logged in, user will see a list of data. The front end web application has three basic functionalities.

The other part is the front end web application, written in the latest Angular framework. This is the part that needs the CORS configuration. The first part is the back end service API application, written with Spring Boot. The sample application I have provided has two parts. I hope this tutorial will provide some useful information for anyone who faces similar problems. For me at the time, I didn't have the know-how so it took me a while to figure out. If you have dealt with this before, you might know what is causing the issue. And the request fails when the back end checks for authentication and authorization. The particular problem I had is that the CORS configuration works when the request is unauthenticated. It took a little more effort for me to get it working. It was very easy to configure CORS for Spring Boot base web application. It is also a complication that we developers must remember to configure/implement for our projects if we need something to be done in a certain way. The CORS check was created to ensure that only the trusted sites can communicate with each other. Why is this such a big deal? Imagine that my web pages are hosted with the URL: My back end service APIs have a different URL: Even though they are using the same host name 'localhost', and the same protocol 'http', the difference of port would make them two unique origins instead of the same origin. Because the two are two different web servers, I have to have CORS properly configured in my API service so that such set up can work, at least for the sake of development. My back end API service runs in Spring Boot hosted web application container. During development, my Angular code runs in a self contained web server.

#Angular access control allow origin how to

I find myself at the cross road, either learn how to play with CORS or go back to the old way of doing things. Once I switched from AngularJS to Angular. I didn't have to face this because the project I have worked with always places my web page related source code with the back end server work. Recently, I was getting a refresher on Angular web application development and had to confront with something I have always avoided before - CORS, Cross Origin Resource Sharing.