java - Propagate HTTP header (JWT Token) over services using spring rest template

Question

I have a microservice architecture, both of them securized by spring security an JWT tokens.

So, when I call my first microservice, I want to take the JWT token and send a request to another service using those credentials.

How can I retrieve the token and sent again to the other service?

Answer 1

Basically your token should be located in the header of the request, like for example: Authorization: Bearer . For getting it you can retrieve any header value by @RequestHeader() in your controller:

@GetMapping("/someMapping")
public String someMethod(@RequestHeader("Authorization") String token) {

}

Now you can place the token within the header for the following request:

HttpHeaders headers = new HttpHeaders();
headers.set("Authorization", token);

HttpEntity<RestRequest> entityReq = new HttpEntity<RestRequest>(request, headers);

Now you can pass the HttpEntity to your rest template:

template.exchange("RestSvcUrl", HttpMethod.POST, entityReq, SomeResponse.class);

Hope I could help