Solution to the problem of token loss when microservice feign is called

feign The principle of microservice invocation is to send a http request , At this time, the original token, So when calling the interface of another service ,token Will lose , It needs to be handled in the code , hold token Carry the past ;

commonly http Requested token In the request header ;

Solution ：

    （1） New interceptors
            Inside the interceptor , obtain token, Then join in templete Inside ;

 

/**
     * feign  Call missing token Solution , New interceptors 
     * @return
     */
    @Bean
    public RequestInterceptor requestInterceptor(){
        return templete -> {
            ServletRequestAttributes requestAttributes =
                    (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
            if(requestAttributes != null){
                HttpServletRequest request = requestAttributes.getRequest();
                if(request == null){
                    return ;
                }else{
                    String token = request.getHeader("token");
                    templete.header("token",token);
                }
            }
        };
    }

Generally, you need to add this code to the interceptors of all involved microservices ; So I will join common Inside the module

Underlying principle