nginx forward proxy https

In transparent proxy mode (simulated by manually binding hosts), use OpenSSL for simulation on the client. Nginx is a web and reverses proxy server that manages the largest website traffic on the internet. I use simple proxy_pass forwarding in nginx for that and letsencrypt for https. Step Two — Configure Jenkins. As L4 forward proxy, NGINX basically transparently transmits traffic to the upper layer, and does not require HTTP CONNECT to establish a tunnel. I am running mailcow on a server that I also use for another application that is served by nodejs. The scenario I want to achieve is: Client makes HTTP request to nginx which is redirect to the same URL but over HTTPS; nginx proxies request over HTTP to the backend; nginx receives response from backend over HTTP. 2) Failure of access due to client’s lack of SNIOne of the key factors mentioned above is to extract SNI fields from Client Hello using ngx_stream_ssl_preread_module. NGINX was initially designed as a reverse proxy server. Use nginx to manually configure the ThinkPHP running environment, In depth explanation of IPv4 and IPv6 regular expressions, Leetcode 41. In this case your location block could be really simple: The proxy server can not see the domain name that the client wants to access in the request URL, as shown below. The destination server does not accept the CONNECT method, so the “Proxy CONNECT aborted” finally appears, resulting in unsuccessful access. Therefore, NGINX stream is not an L4 proxy in a strict sense, and it must seek help from the upper layer to extract the domain name. Here was the trace with curl, where the proxy runs on 19 The difference between forward proxy and reverse proxy is that the proxy object is different. Nginx (pronounced “Engine-X”) is a Linux-based web server and proxy application. Docker; How to use $ docker run --rm -d -p 3128:3128 hinata/nginx-forward-proxy:latest $ curl -x http://127.0.0.1:3128 https://www.google.co.jp Links You need to add the following in location or server directives. Squid offers a lot of features, but it's purpose is to work as forward-proxy, not reverse. That's why you probably couldn't find much configuration for it. I used 444 instead of 443 for https. Two TLS/SSL sessions are set up on the client-proxy-server link. The following steps briefly outlines the process. It’s also a powerful tool that redirects the less secure HTTP web traffic to a secured HTTPS web server. The first section tells the Nginx server to listen to any requests that come in on port 80 (default HTTP) and redirect them to HTTPS. Install the patch for the corresponding version, and add the --add-module=/path/to/ngx_http_proxy_connect_module parameter under the "configure" command, as shown in the following example. Once the proxy replies with “HTTP/1.1 200 Connection Established”, the client initiates a TLS/SSL handshake and sends traffic to the server. As early as 1998 when TLS was still not formally available, Netscape, which promoted the SSL protocol, proposed using the Web proxy for the tunneling of SSL traffic. Configure Nginx to forward requests requires with the following simple configuration file, nginx.conf: This configuration forwards all requests to the upstream Flask server. We want use nginx as reverse_proxy. The following sections describes these solutions in detail. For example, a Web Gateway device on an enterprise network is a transparent proxy. Thus, it is unnecessary to set the HTTP(S) proxy on the client. The following snippet shows the result. According to the classification in the preceding sections, when NGINX is used as the HTTPS proxy, the proxy is a transparent transmission (tunnel) proxy, which neither decrypts nor perceives the upper layer traffic. Seems like nginx does not support forward proxy mode with SSL. Nginx (pronounced “Engine-X”) is a Linux-based web server and proxy application. Generate Self Signed certificate and key to configure Nginx. Linux compression command and decompression script, Three techniques must be mastered in Web Development: token, cookie and session, Amway: time management software stress testing software JMeter wechat applet visual code generation hacker website, Methods and steps of deploying LNMP & phpMyAdmin with docker, The most authoritative caffeine course in the whole network, Detailed tutorial on Web pack 4, building react scaffolding from scratch (4), “PHP” does not rely on the integrated environment. The CONNECT request must specify the target host and port that the client needs to access. ... For this to work, the proxy must be set up to forward incoming requests with a location starting with /internal/humio to the Humio server and Humio must be configured with a proxy prefix url /internal/humio. Regular http requests were passed fine. Using NGINX stream to proxy HTTPS traffic at the TCP level is bound to encounter the problem mentioned at the beginning of this article: the proxy server cannot obtain the destination domain name that the client wants to access. This guide will show you how to redirect HTTP to HTTPS using Nginx. In order to obtain the target domain name of HTTPS traffic without decrypting HTTPS traffic, the only method is to use the SNI field contained in the first ClientHello packet during the TLS/SSL handshake. Nginx is a powerful tool for redirecting and managing web traffic. You can easily build a HTTP proxy server using this. Nginx (pronounced engine-x) is a powerful open source high performing HTTP web server. There is some additional Nginx magic going on as well that tells requests to be read by Nginx and rewritten on the response side to ensure the reverse proxy is working. The L4 forward proxy transparently transmits the upper-layer HTTPS traffic and does not require HTTP CONNECT to establish a tunnel. Which files are generally managed? A reverse proxy is a service that takes a client request, sends the request to one or more proxied servers, fetches the response, and delivers the server’s response to the client. And I will show you how you can easily secure any app or website with trusted HTTPS … In this repository, it is used as forward proxy. Here was the trace with curl, where the proxy runs on 19 It is the third most popular web server and well known for its enhanced performance, ease of use and configuration, stability and minimum resource utilization. A Nginx HTTPS reverse proxy is an intermediary proxy service which takes a client request, passes it on to one or more servers, and subsequently delivers the server’s response back to the client. Therefore, the client is aware of the proxy in this process. This article is the original content of Yunqi Community, which can not be reproduced without permission. Nginx (pronounced engine-x) is a powerful open source high performing HTTP web server. Considering CentOS 7 environment as an example, let’s take a look at the process in detail. The proxy server specifically transmits the HTTPS traffic over TCP transparently. Requirements You need a website running on Nginx. Using NGINX as HTTPS Forward Proxy Server NGINX is mainly designed as a reverse proxy server, but with the development of NGINX, it can also be used as one of the options of forward proxy. The preceding details printed by the “-v” parameter indicate that the client first establishes an HTTP CONNECT tunnel with the proxy server 39.105.196.164. The last sentence summarizes this article The proxy server standing on the client side is the forward proxy, The proxy server standing on the side of the original server is the reverse proxy, Nginx passesproxy_passYou can … The following needs to be kept in mind while doing this, Forward the request at root level server block to Nextcloud server. In turn, the server may potentially know nothing about your forward proxy. The original diagram in INTERNET-DRAFT is as follows: For more information about the entire process, refer to the diagram in the HTTP: The Definitive Guide. Usually, Nginx is used to serve and cache static assets or as proxy or load balancer for incoming traffic to application servers. Nginx has reasonable default for this directive. In turn, the server may potentially know nothing about your forward proxy. In summary, this block is telling Nginx to accept HTTPS connections, and proxy those requests in an unencrypted fashion to Home Assistant running on port 8123. Serve Jenkins more securely with Nginx as a front-end proxy server. Nginx Reverse Proxy. While most common applications are able to run as web server on their own, the Nginx web server is able to provide a number of advanced … Access the client using the “-x” parameter of cURL as shown below. Though, the command parameters are similar to those of the HTTP block. A transparent proxy is achieved if the self-signed Root CA certificate is pushed to the client, which is implemented in the internal environment of an enterprise. Take the environment of CentOS 7 for example. As the snippet shows, the preceding request terminates in the TLS/SSL handshake phase after ClientHello is sent. The proxy server uses the host and port in the HTTP CONNECT request to establish a TCP connection with the destination server. The “proxy” role is transparent to the client. But it can still be used as a forward one. NGINX was initially designed as a reverse proxy server. Using NGINX stream as a proxy of the HTTPS traffic at the TCP layer, leads to the same problem mentioned at the beginning of this article: the proxy server does not obtain the target domain name that the client wants to access. It can work as a reverse proxy or POP3/IMAP proxy. Therefore, “Proxy CONNECT aborted” reflects in the above snippet, resulting in an access failure. In this guide, we will explain how to redirect the HTTP traffic to HTTPS in Nginx. The Root CA certificate among the proxy self-signed certificates must be trusted on the client. In turn, the server may potentially know nothing about your forward proxy. Copyright © 2019 Develop Paper All Rights Reserved, Configuration of SSH and HTTP in gitlab environment. After HTTPS traffic arrives at the proxy server, it is transmitted directly to the remote destination server through TCP. In order to get the destination domain name, we must have the ability to disassemble the upper message to get the domain name information, so NGINX stream is not a four-tier agent in the strict sense, or it needs a little help from the upper ability. NGINX has officially supported the use of the ngx_stream_ssl_preread_module module, which is mainly used to obtain SNI and ALPN information in Client Hello messages, since version 1.11.5. ; Build nginx. So proxy HTTPS traffic, compared with HTTP, needs to do some special processing. This article will introduce two schemes of using NGINX to forward proxy HTTPS traffic, as well as their usage scenarios and main problems. The following snippet shows the commands on the client: Now, let’s take a quick look at the key problems concerning the L4 solution. The other ones has the focus on being reverse proxies :)  Specifically, two NGINX solutions are available: Layer 7 (L7) and Layer 4 (L4). The main configurations are as follows: For 4-tier forward proxy, NGINX basically passes through the upper traffic, and does not need HTTP CONNECT to build tunnels. The core idea is to use the HTTP CONNECT request to establish an HTTP CONNECT tunnel between the client and the proxy. The answer is yes. It is the third most popular web server and well known for its enhanced performance, ease of use and configuration, stability and minimum resource utilization. Also, add ngx_http_proxy_connect_module for the existing environments as shown below. For example, when you specify the IP address and port 3128 of the Squid server on the client. Forward proxy is something the client sets up in order to connect to rest of the internet. proxy_connect_.patch disables nginx REWRITE phase for CONNECT request by default, which means if, set, rewrite_by_lua and other REWRITE phase directives cannot be used. As a reverse proxy server, NGINX does not officially support the HTTP CONNECT method. This happens because the information obtained at the TCP layer is limited to the IP address and port, without obtaining the domain name. Firewall was disabled on the proxy server. Another good option is Varnish. Missing first positive number | Python. 5.1 — The Nginx reverse proxy forwards all requests to the Flask application on port 5000. ... Configure NGINX to Redirect HTTP to HTTPS. Sans détailler le fonctionnement exhaustif d'un reverse proxy, il faut savoir que ceux-ci … For a four-tier forward agent, the ability to extract SNI from Client Hello messages is critical, otherwise the NGINX stream solution cannot be established. The proxy object of forward proxy is client, and the proxy object of reverse proxy is server. Hi, I was experimenting using nginx as forward proxy with the conf as attached. How to Use Nginx to Redirect. Because of its performance and scalability, NGINX is often used as a reverse proxy for HTTP and non-HTTP servers. It does not decrypt or perceive the specific content of its proxy traffic. The following snippet shows the main configuration. But any https were rejected right away. Nginx is a very fast HTTP and reverse proxy server. It summarizes the principles, environment building requirements, application scenarios, and key problems of the solutions where NGINX acts as the HTTPS forward proxy using the HTTP CONNECT tunnel and NGINX stream. NGINX proxy manager is a reverse proxy management system, that is based on NGINX with a nice and clean web UI. Unlike HTTP, configure NGINX stream in the stream block. Answer for How to use git to manage the code of webpack? Critical question is whether manually setting the HTTP(S) proxy on the client, ensures a successful access attempt. The client performs direct TLS/SSL interaction with the target server. However, with continuous development, NGINX also serves as one of the options to implement the forward proxy. Internally, Nginx is accessing HA in the same way you would from your local network. According to the classification method mentioned above, NGINX’s solution to HTTPS proxy belongs to the transmission (tunnel) mode, that is, it does not decrypt and does not perceive the upper traffic. Add the -- with-stream option under the configure command to enable this module. Performance Test on an API Using Gatling. If all of the websites hosted on the server are configured to use HTTPS, and you don’t want to create a separate HTTP server block for each site, you can create a single catch-all … 1) The client sends an HTTP CONNECT request to the proxy server.2) The proxy server uses the host and port information in the HTTP CONNECT request to establish a TCP connection with the target server.3) The proxy server returns an HTTP 200 response to the client.4) The client establishes an HTTP CONNECT tunnel with the proxy server. Redis performance index monitoring! The Nginx server on Docker proxies the request to UWSGI. Build nginx with this module from source: Now I set up mailcow on the mail..com subdomain. In transparent proxy mode (simulated by manually binding hosts), we can use OpenSSL to simulate on the client side: By default, OpenSSL s_client does not have SNI. OpenSSL s_client does not include SNI by default. Nginx in EC2 decrypts the HTTPS request and passes the HTTP to it's Docker container. The classification of forward agents is briefly introduced as background knowledge for understanding the following: As a reverse proxy, the proxy server usually terminates the HTTPS encrypted traffic and forwards it to the back-end instance. Otherwise, the NGINX stream proxy wouldn't know the target domain name that the client needs to access. Using Nginx as a https reverse proxy. The original drawings in Draft are as follows: The whole process can refer to the chart in the HTTP authoritative guide: NGINX serves as a reverse proxy server, and the HTTP CONNECT method has not been officially supported. 1) Access attempt failure due to the manual proxy settings on the client. Whenever you make changes to the configuration files you need to restart or reload the Nginx service for changes to take effect:. Common Proxy: Here, the proxy address and port are manually configured in the browser or system environment variables on the client. Un reverse proxy est un serveur faisant tourner un service web, celui-ci va être positionné en frontal d'un ou plusieurs serveurs web. This article describes the NGINX proxy mode pertaining to this type. Regular http requests were passed fine. On this server i have ssl enabled listen port 9443. In turn, the server may potentially know nothing about your forward proxy. We can simulate it by binding / etc / hosts on the client side. Setup HTTPS on Nginx; Optimize HTTPS on Nginx and get an A+ score on the SSLlabs test. Client sends HTTP CONNECT request to proxy server. How much do you know? On the other hand, when acting as a forward proxy and processing the traffic sent by the client, the proxy server doesn’t see the target domain name in the URL requested by the client since the HTTP traffic is encrypted and encapsulated in TLS/SSL, as shown in the following figure. Because the proxy server does not know which destination domain to forward Client Hello to. Encryption, decryption, and authentication of HTTPS traffic occur between the client and the reverse proxy server. Forward Proxy Though Nginx is a reverse proxy designed to be used with explicitly defined upstreams: http { upstream myapp1 { server srv1.example.com; server srv2.example.com; server srv3.example.com; } server { listen 80; location / { proxy_pass http://myapp1; } } } A reverse proxy will listen for client web requests and forwards them directly to your app or website. Since the upper-layer traffic is transparently transmitted, the critical question that arises here, is whether NGINX should serve as an “L4 proxy” to implement completely transparent transmission of protocols above TCP/UDP. The answer is yes. Forward proxy itself is not complicated, and how to proxy encrypted HTTPS traffic is the main problem to be solved by forward proxy. Hi, I was experimenting using nginx as forward proxy with the conf as attached. NGINX has officially supported the ngx_stream_core_module module since version 1.9.0. The syntax is as follows. # curl https://www.baidu.com -svo /dev/null -x 39.105.196.164:443, # openssl s_client -connect www.baidu.com:443 -msg, # openssl s_client -connect www.baidu.com:443 -servername, Automating Different Technologies using Python, Building a Game With TypeScript. If the whole response does not fit into memory, a part of it can be saved to a temporary file on the disk. The command is as follows: This paper summarizes the principle, environment, scenarios and main problems of NGINX using HTTP CONNECT tunnel and NGINX stream to do HTTPS forward proxy, hoping to provide reference for you when doing various scenarios forward proxy. As Long You Are Using Raw SQL Calls…, Vim for Developers: Part 2 — Advanced Basics. ⭐ ⭐ ⭐ ⭐ ⭐ Forward proxy https nginx ‼ from buy.fineproxy.org! nginx-forward-proxy What is this? When buffering is enabled, nginx receives a response from the proxied server as soon as possible, saving it into the buffers set by the proxy_buffer_size and proxy_buffers directives. For example, when the target domain name is directed to the proxy server by means of DNS resolution, it require simulating the transparent proxy mode by binding /etc/hosts to the client. Forward proxy https nginx from Fineproxy - High-Quality Proxy Servers Are Just What You Need. The proxy server returns the HTTP 200 response to the client. The module is not built by default. This article describes two methods for using NGINX as the forward proxy for HTTPS traffic, as well as their application scenarios and principal problems. Here is a link with more explanation from … The forward proxy itself is not complex, the key issue it addresses is how to encrypt HTTPS traffic. What is NGINX proxy manager. You should use URI part in proxy_pass directive. This article serves as a reference while you use NGINX as a forward proxy in various scenarios. As early as 1998, in the SL era when TLS was not formally born, Netscape, which dominates the SSL protocol, proposed INTERNET-DRAFT for tunneling SSL traffic using web agents. When configure is needed, the – with-stream option is added to turn it on. However, thanks to the modular and scalable features of NGINX, Alibaba @chobits provides the ngx_http_proxy_connect_module connect module (content in Chinese) to support the HTTP CONNECT method, to extend NGINX as a forward proxy. Tunnel Proxy: This is a proxy that transparently transmits traffic. To begin with, let’s take a closer look at the classification of the forward proxy. In all, the parts that you need to configure to forward the Client IP Address are the TCP passthrough on ELB and each of the two Nginx servers. But it can still be used as a forward one. Enables or disables buffering of responses from the proxied server. The encryption, decryption and authentication process of HTTPS traffic occurs between the client and the reverse proxy server. The forward proxy itself is not complex, the key issue it addresses is how to encrypt HTTPS traffic. 1) InstallationFor the newly installed environment, refer to the normal installation steps and the steps of installing this module (https://github.com/chobits/ngx_http_proxy_connect_module), type the corresponding version of the patch and add the parameter – add-module=/path/to/ngx_http_proxy_connect_module when configuring. 1、 Introduction In practice, we need proxy service when the client can’t make a request with the server directly. Execute the following commands to configure the nginx.conf file. At the same time, this also brings a limitation, requiring all clients to bring SNI fields in the TLS/SSL handshake, otherwise the NGINX stream proxy can not know the destination domain name the client needs to access. Also, you mixed up order arguments of proxy_redirect directive, and probably you don't need it at all. You need an authentication source that supports Oauth (GSuite, Github, ...) You need SSH access to your server. Using NGINX as HTTPS Forward Proxy Server Time:2019-8-6 NGINX is mainly designed as a reverse proxy server, but with the development of NGINX, it can also be used as one of the options of forward proxy. If i got the documentation correctly, then I need to use a custom port. You can see that the above request ends at the TLS/SSL handshake stage when Client Hello is issued. How to Use Nginx to Redirect. On the client side, access with curl plus-x parameter is as follows: From the details printed out by the above-v parameter, we can see that the client first established the HTTP CONNECT tunnel to the proxy server 39.105.196.164, and the proxy responded to the HTTP/1.1 200 Connection Establishment and began to interact with TLS/SSL handshake and traffic. However, as NGINX transparently transmits the traffic, the CONNECT request is directly forwarded to the target server. Input System 3/3, From PHP to Golang or Rust? We can configure Nginx to act as a reverse proxy to forward all requests to the Nextcloud server. This article will demonstrate the scenario […] Follow me to keep abreast with the latest technology news, industry insights, and developer trends. If you want to redirect them: Forward proxy itself is not complicated, and how to proxy encrypted HTTPS traffic is the main problem to be solved by forward proxy. It can be easily configured to redirect unencrypted HTTP web traffic to an encrypted HTTPS server. But any https were rejected right away. To get the domain name accessed by HTTPS traffic without decryption, only the extended address SNI (Server Name Indication) in the first Client Hello message of the TLS/SSL handshake is used. 1) InstallationFor newly installed environments, refer to the normal installation steps and add the options of — with – stream, — with – stream_ssl_preread_module and — with-stream_ssl_module directly when configuring. If the client does not include SNI in the ClientHello packet, the proxy server wouldn't know the target domain name, resulting in an access failure. You can easily rewrite/redirect all http requests to https with Nginx web server. Try this container Requirement packages. The proxy server’s role is to pass through HTTPS traffic, and it does not need to decrypt HTTPS. The client and proxy server set up the HTTP CONNECT tunnel. You will need to use something like Squid instead. Nginx is originally designed to be a reverse proxy, and not a forward proxy. In the L7 solution, the HTTP CONNECT request must establish a tunnel, and therefore, the proxy server is a common proxy that the client must perceive. Examples are as follows: For the environment that has been installed, compiled and installed, we need to add the above three stream-related modules, the steps are as follows: 2) nginx.conf file configurationNGINX stream, unlike HTTP, needs to be configured in stream blocks, but the instruction parameters are similar to HTTP blocks. Since we are using the method of passing through the upper layer traffic, can we not be a “four-layer proxy” to thoroughly transmit the protocol over TCP/UDP? sudo systemctl reload nginx Redirect All Sites to HTTPS #. Agents are divided into forward proxy and reverse proxy. However, with continuous development, NGINX also serves as one of the options to implement the forward proxy. However, based on the modularization and scalability of NGINX, Ali’s @chobits provides the ngx_http_proxy_connect_module module to support the HTTP CONNECT method, so that NGINX can be extended to forward proxy. Your site should now always redirect to a URL with the format of https://example.com, regardless of the link being prefaced by http:// and/or www.. Redirect HTTP to HTTPS for all sites. To obtain the target domain name, the proxy must be able to extract the domain name from the upper-layer packets. If the client does not carry SNI fields, the proxy server will not be able to know the destination domain name, resulting in unsuccessful access. Because the information acquired at TCP level is limited to IP and port level, there is no chance to get domain name information. I have nginx configured to be my externally visible webserver which talks to a backend over HTTP. The target server does not accept the CONNECT method. ; proxy_connect_rewrite_.patch enables these REWRITE phase directives. For the newly installed environment, refer to the common installation steps (content in Chinese), and directly add the --with-stream, --with-stream_ssl_preread_module, and --with-stream_ssl_module options under the "configure" command. The steps are as follows: Layer 7 needs to build tunnels through HTTP CONNECT, which belongs to the common proxy mode that the client perceives. It needs to manually configure the IP and port of HTTP (S) proxy server on the client side. nginx는 현재 (2019.10)최신버전인 1.17.0로 설치를 진행하겠습니다. 1) The client manually sets up the proxy causing the access to be unsuccessfulThe four-tier forward proxy is to pass through the upper HTTPS traffic, and it does not need HTTP CONNECT to establish the tunnel, that is to say, it does not need the client to set up HTTP (S) proxy. The result indicates that the client tries to establish an HTTP CONNECT tunnel before NGINX. For a L4 forward proxy, the ability to extract SNI from the ClientHello packet is crucial, otherwise the NGINX stream solution will not be implemented. Nginx is originally designed to be a reverse proxy, and not a forward … Therefore, unlike HTTP traffic, HTTPS traffic requires some special processing during proxy implementation. Oauth Proxy is a reverse proxy and static file server that provides authentication using Providers (Google, GitHub, and others) to validate accounts by email, domain or group.. Nginx is originally designed to be a reverse proxy, and not a forward proxy. Forward proxy is something the client sets up in order to connect to rest of the internet. Nginx HTTPS Reverse Proxy Overview. Firewall was disabled on the proxy server. Manually configure the IP address and port of the HTTP(S) proxy server on the client. As a forward proxy, HTTP encryption is encapsulated in TLS/SSL when dealing with the traffic from the client. https://testapp.mobios.example.com i want to pass this traffic to my server with the ip address 192.168.0.10. In this article, we will know how to redirect HTTP to HTTPS in Nginx. This guide will show you how to redirect HTTP to HTTPS using Nginx. Forward proxy itself is not complicated, and how to proxy encrypted HTTPS traffic is the main problem to be solved by forward proxy. This, however, also brings a restriction that all clients must include the SNI field in the ClientHello packets during the TLS/SSL handshake. The application hosted by UWSGI handles the request. nginx를 설치하고 proxy 설정에 필요한 모듈인nginx_http_proxy_connect_module을 설치해줍니다. This occurs because the proxy server does not know the target domain name where ClientHello should be forwarded. Optionally, set up HTTP Public Key Pinning (HPKP) ... Do you want to redirect the visitors to port 8000, or proxy/forward the traffic to port 8000? Just imagine that 1000 or 100 000 IPs are at your disposal. Note: In this case, the client actually obtains the self-signed certificate of the proxy server in the TLS handshake process, and verification of the certificate chain is unsuccessful by default. nginx 1.10.3. i am new to nginx and need help on proxy_pass to https. For new environment installation, refer to the common installation steps (content in Chinese) for installing the ngx_http_proxy_connect_module connect module. It can be easily configured to redirect unencrypted HTTP web traffic to an encrypted HTTPS server. A 'nginx-foward-proxy' is a so simple HTTP proxy server using the nginx. We have clients in internet they call a url for example. It can work as a reverse proxy or POP3/IMAP proxy. Lorsque l'on gère une infrastructure web avec plusieurs serveurs et plusieurs sites web, il est souvent utile, pour des raisons de sécurité et de gestion, de mettre en place un reverse proxy.

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