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Why my first request took so long to get response through zuul gateway

I'm using eureka and zull as client discovery and gateway.
But while testing applications, I found that the first request will take a very long time to get response.
I have read springcloud documentation and also checked for stackoverflow to find any solution.
But so far the solutions from google which I found did not solve the problem.
below is part of the configuration:
zuul:
ignored-headers:
- Vary
- Access-Control-Allow-Origin
ribbon:
eager-load:
enabled: true
routes:
resourceCenter:
path: /web-resource-center/**
serviceId: web-resource-center
stripPrefix: true
messageCenter:
path: /web-message-center/**
serviceId: web-message-center
stripPrefix: true
webSystem:
path: /web-system/**
serviceId: web-system
stripPrefix: true
security:
path: /web-security/**
serviceId: web-security
stripPrefix: true
taskCenter:
path: /web-task-center/**
serviceId: web-task-center
stripPrefix: true
ribbon:
eager-load:
enabled: true
clients:
- web-resource-center
- web-task-center
- web-security
- web-message-center
- web-system
while not configured, the request will take 2s-4s to get response.
I have configured ribbon and zuul to eager load ,and that may speed up the first request for about 50%
while , the requests after the first one will take only less than 100ms each, I don't know why.
Also one thing here to cunfuse me : If I set a feign request in a controller then request this controller the slow response will not happen. So, are there any mistakes I have made configuring my application.yml?
please help me please,thanks a lot!

I found this problem to, when I restart my micro service, the first request though gateway will take 2-3s, and then took less than 100ms. after I configure ribbon eager load, also tooks 600ms. I dont konw how to handle this problem.

OAuth2 spring security with google callback not working

i have developed the micro service application, in that application there is a service call user service which is running on port 8281. This service handle the authentications. when i test the service in local environment this is worked fine. But if i call this service using zuul api gateway this is not working. following property in the application.yml file is use to get the redirect url in the local environment. This is worked fine.
security:
oauth2:
client:
registration:
google:
redirectUri: "http://localhost:8281/oauth2/callback/google"
But if i change this property as follow for connect with zuul api gateway.
security:
oauth2:
client:
registration:
google:
redirectUri: "http://localhost:8080/api/user/oauth2/callback/google"
This is not working and is throw this error message [authorization_request_not_found]. localhost:8080 is the zuul api gateway. zuul has configure to forward request to user service like this.
zuul:
prefix: /api
routes:
auth-service:
path: /user/**
serviceId: USER-SERVICE
stripPrefix: true
sensitiveHeaders: Cookie,Set-Cookie
so why this error is thrown ?

getting cors issue when hitting request to grails

Iam getting this issue
Access to XMLHttpRequest at 'http://localhost:8082/v1/store/getstore' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.
My config in application.yaml is
grails:
cors:
enabled: true
allowedOrigins:
- http://localhost:4200
and in url mapping
"/v1/store/getStore"(controller: 'store', action: 'getStore')
when i directly hit request as "http://localhost:8082/store/getstore" its not throwing error but after placing in urlMapping its throwing cors issue.

create proxy.conf.json file at root folder and edit the below:
{
"/": {
"target": "http://localhost:8082/",
"secure": false
}
}
change the package json command for start:
"start": "ng serve --proxy-config proxy.conf.json --open",
use the URL mapping as same "/v1/store/getStore"(controller: 'store', action: 'getStore')

Spring cloud loadBalanced userInfoUri problems

Im using spring cloud, in the following layout:
registry server
oauth2 server
zuul proxy
a simple crud microservice
On the crud service, Im trying to authenticate against my oauth2 server using
security:
oauth2:
resource:
loadBalanced: true
userInfoUri: http://auth_service/users/current
I can fetch the token from the oauthserver, but when I use the token to request the crud service I got
2017-01-07 10:46:02.638 INFO 16186 --- [nio-9001-exec-4] o.s.b.a.s.o.r.UserInfoTokenServices : Getting user info from: http://auth_service/users/current
2017-01-07 10:46:02.639 INFO 16186 --- [nio-9001-exec-4] o.s.b.a.s.o.r.UserInfoTokenServices : Could not fetch user details: class java.lang.NullPointerException, null
If I change the oauth client to hit the oauth server without the loadBalanced option, it works fine
security:
oauth2:
resource:
userInfoUri: http://localhost:4444/auth_service/users/current #through zuul proxy
I tried to debug, but this nullpointer exception occurs very deep on rest template implementations. Please, I need some help here.

I have something like this in mine try this configuration to see if it might work.
zuul:
routes:
user-service:
path: /user/**
stripPrefix: false
security:
# Disable Spring Boot basic authentication
basic:
enabled: false
oauth2:
client:
accessTokenUri: http://<zuulHostname>/user/oauth/token
userAuthorizationUri: http://<zuulHostname>/user/oauth/authorize
...

Kindly check the token that you are getting does it have complete information about the user. Most importantly the userName. It should be set when you generate the token. You can see what information is in the token by parsing the token here

Spring OAuth Authorization Server behind Spring Cloud Zuul Proxy

I am currently developing a application based on a micro service architecture. We use a API-Gateway implemented using Spring Cloud Netfix's Zuul Server to route the requests to our micro services.
To realize single sign on for all our services I am currently working on an OAuth2 server set up using Spring Cloud Security. The server is basically just copy and past of the implementation in Dave Syer's Repo: https://github.com/dsyer/spring-security-angular/tree/master/oauth2/authserver
The main difference is that I want to route the requests to my OAuth server through the Zuul Proxy. This way I will not have to directly expose my OAuth Server and can add and remove Login Server dynamically.
The problem is I do not seam to understand how to correctly configure this setup. When I try to access a protected resource on the OAuth server I am forwarded to the login page. This of course is as expected. But I can not figure out how to set the hostname and port used when forwarding. What I want to happen is the server to forward to an endpoint on the Zuul server that will get proxied back to the OAuth server. (The Zuul API-Gateway should be the only server the client ever talks to. Everything else will be hidden.)
As it is the host and port are read from the HttpServletRequest in LoginUrlAuthenticationEntryPoint. But the request the server sees is the request send by the Zuul proxy. So I am forwarded to an internal IP not an endpoint on the proxy.
I tried to set the URL of the login page in WebSecurityConfigurerAdapter.configure(HttpSecurity) to the absolut URL of my Zuul Proxy. But this just caused my application to complain about too many redirects. (Might have caused a loop there.)
What would be the best way to set this up?
Do I have to implement some kind of own forwarding strategy by overriding a bean?
Is there a configuration option I am missing?
Is my idea itself wrong? (In his answer to How to avoid redirect to another host with Zuul? Dave Syer says you would not normally proxy this but does not explain why.)

Update: POC can be found here https://github.com/kakawait/uaa-behind-zuul-sample
Did you try following setup (on zuul server):
zuul:
routes:
uaa-service:
path: /uaa/**
stripPrefix: false
security:
# Disable Spring Boot basic authentication
basic:
enabled: false
oauth2:
sso:
loginPath: /login
client:
accessTokenUri: https://<zuul hostname>/uaa/oauth/token
userAuthorizationUri: https://<zuul hostname>/uaa/oauth/authorize
...
Basically it works on my project only thing I have to do is to disable CSRF protection on /uaa/oauth/token route.
Auth server should be on
server:
# Use different context-path to avoid session cookie overlapping
context-path: /uaa
Tested using Spring-Cloud.Brixton.M3
Thank to #thomas-letsch, you should tweak you security like following (sample)
public void configure(HttpSecurity http) throws Exception {
http.logout().and()
.antMatcher("/**").authorizeRequests()
.antMatchers("/index.html", "/home.html", "/", "/uaa/oauth/**").permitAll()
.anyRequest().authenticated().and()
.csrf().csrfTokenRepository(getCSRFTokenRepository()).ignoringAntMatchers("/uaa/‌​oauth/token").and()
.addFilterAfter(createCSRFHeaderFilter(), CsrfFilter.class);
}

As far as I understand your question, spring-cloud-security (for the EnableOauth2Sso part) and spring-cloud (for zuul), this is not possible to proxy the calls to the authorization server using zuul.
The main reason being that spring-cloud-security secures the Gateway independently (and before accounting for) Zuul routing's logic.
Which means that the (sample configuration from Dave Syer's OAuth2 example) spring.oauth2.client.* configuration
spring:
oauth2:
client:
accessTokenUri: http://localhost:9999/uaa/oauth/token
userAuthorizationUri: http://localhost:9999/uaa/oauth/authorize
clientId: acme
clientSecret: acmesecret
is considered before allowing any access to the Zuul's routes zuul.routes.*
Moreover this setup enables the client agent to store two Cookies: one for the Gateway and one for the Authorization Server.
I hope this helps.