Practical experience of implementing nginx to forward requests based on URL

Preface

Because this is a distributed file system that has been deployed externally on the intranet, using fastdfs. The application is deployed to port 8088, and its backend management system is deployed on port 8089 (on the same intranet server). The service of the backend management system needs to request the fastdfs service, which can be directly requested (resources of the same server). However, we have only externalized the backend management system (Springboot project) and can only access the backend management system without using the IP allocated by the public network. To directly access the interface of the fastdfs service, you must connect to the server public network, but this limits our users' access (I can't go to your server every time to access it, I think I can access it from other places)

Proxy server: SockerServer listens to a port, connects to the specified server port according to the http message, and makes data requests
- HTTP Proxy
The http request passes through the proxy server, and the proxy server is only responsible for forwarding the corresponding http response body.
- HTTPS Proxy
When an https request passes through the proxy server, a CONNECT message will be sent to establish a tunnel with the proxy server. If the proxy server returns HTTP 200, the tunnel is established successfully. The subsequent proxy server only needs to be responsible for forwarding data. In fact, the SSL/TLS handshake still occurs between the client and the real server.

ProxyServlet

Because the backend project port 8089 can access the server fastdfs service, my first thought is to use Springboot's ProxyServlet to proxy the specified request to the server port 8088

The main Servlet of Spring boot is the DispatcherServlet of SpringMVC, and its default url-pattern is "/". If we want to add different calls (other server interfaces) to a certain url, we need to create a new proxy servlet, which will use ServletRegistrationBean, create a new ProxyServlet to handle the listening and data sending of different ports, and register it with the servletContext managed by springboot (set the specified server and port, and request the interface for forwarding)

rely

<dependency>
 <groupId>org.mitre.dsmiley.httpproxy</groupId>
 <artifactId>smiley-http-proxy-servlet</artifactId>
 <version>1.7</version>
 </dependency>

Configuration

### Configure the proxy# When requesting resource, the proxy forwards to port 8088 in the project proxy.test.servlet_url_one= /resource/*
proxy.test.target_url_one= https://localhost:8088

@Component
@Data
public class ProxyFilterServlet {
 @Value("${proxy.test.target_url_one}")
 private String targetUrl;
 @Value("${proxy.test.servlet_url_one}")
 private String servletUrl;
}

Change config to add

@Configuration
public class ProxyServletConfig {
 @Autowired
 private ProxyFilterServlet proxyFilterServlet;
 //Multiple proxy servlets can configure multiple beans
 @Bean
 public ServletRegistrationBean servletRegistrationBean(){
 ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new ProxyServlet(), proxyFilterServlet.getServletUrl());
 //This setName must be set, and when there are multiple, the names need to be different servletRegistrationBean.setName("go_backend");
 servletRegistrationBean.addInitParameter("targetUri", proxyFilterServlet.getTargetUrl());
 servletRegistrationBean.addInitParameter(ProxyServlet.P_LOG, "false");
 return servletRegistrationBean;
 }
}

Establish a connection with the target server through the servlet container. After all, it is not as powerful as a professional proxy server like nginx.

nginx—Proxy forwarding

• At this time, I thought of adding a layer of nginx between the servers to forward different service requests to different port APIs for processing.

Transfer the external network request to the same server intranet port

server {
 listen 80;
 server_name 127.0.0.1;
 
 location / {
 proxy_pass http://127.0.0.1:3000;
 }
 
 location ~ /api/ {
 proxy_pass http://172.30.1.123:8081;
 }
}

Reference blog post:

https://www.jb51.net/article/174382.htm

https://www.jb51.net/article/174383.htm

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