Httpd Forward Proxy

Posted on  by admin

My usecase:

A forward proxy, or gateway, or just 'proxy' provides proxy services to a client or a group of clients. There are likely hundreds of thousands of open forward proxies on the Internet. They store and forward Internet services (like the DNS, or web pages) to reduce and control the bandwidth used by the group. The client must be specially configured to use the forward proxy to access other sites. Httpd can be used to implement a forward proxy with modproxy. The forward proxy is activated using the ProxyRequestsdirective.

  1. First, if you don't need to run a proxy server, disable modproxy by commenting out its LoadModule line or setting ProxyRequests off in httpd.conf. Remember that disabling ProxyRequests does not prevent you from using a reverse proxy with the ProxyPass directive.
  2. It is very important that this is the case. There is no point in implementing a reverse proxy to servers that do not work themselves, it just adds an additional layer to debug. The aim is to have Apache httpd serving SSL on only port 8443 on acting as a reverse proxy to. No other ports will be served by Apache httpd.
  3. UPDATED w/ Suggestions - Still not forwarding to port 8080. Sudo a2enmod proxy && sudo a2enmod proxyhttp && sudo service apache2 restart Share. (somewhere in /etc/httpd/conf I'm guessing.) – Jeremy Apr 1 '15 at 18:21. It worked, but I saw that in the welcome page of my application, the css was not loaded (which earlier worked on.

I have to talk to a third party server(thirdparty.server.com) , which is accessible only via allowed.server.com. And, my.server.com has access to allowed.server.com.

This calls for Apache forward proxy on allowed.server.com.

These steps pertain to httpd 2.4.4
1. Download Httpd
2. Go to bin folder

The enable-mods-shard option will install the modules needed for setting up a forward proxy. Also refer to this if you need to modify your apache installation (rather than recompiling again)
how-to-install-mod_proxy-module-into-apache-788406/
I ran into these errors while configuring

download the latest versions of both APR and APR-Util from Apache APR, unpack them into ./srclib/apr and ./srclib/apr-util (be sure the domain names do not have version numbers; for example, the APR distribution must be under ./srclib/apr/). Reference: http://stackoverflow.com/questions/9436860/apache-httpd-setup-and-installation

Then the pcre errors

Download PCRE from PCRE.org

Compile it with a prefix and install it:

Go back to where your Apache installation is and compile Apache with PCRE:

Once configure is successful, do make and ‘make install’.

Got to conf/httpd.conf

Uncomment these lines

Netscaler forward proxy

Change your port if needed

Set the forward proxy

Forward

And now, when you do http://my.server.com/test -> it will redirect to http://www.google.com

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by Jim van de Erve

This article will show you how to use the Application Request Routing (ARR) and URL Rewrite features of Internet Information Services (IIS) to implement a forward proxy server.

Overview

Application Request Routing is a feature of IIS that enables you to control Internet traffic using a proxy server. A proxy server acts as a single point of contact serving clients on the request side or Web server workers on the response side. On the request side, the proxy accepts a request from one of multiple clients, and forwards it to the Internet. To the Internet the request appears to be coming from the proxy, rather than from the client. On the response side, the proxy accepts a request from the Internet, and distributes it to one of multiple workers. To the Internet the request appears to be processed and a response appears to be generated by the proxy server itself, rather than from one of the backend workers.

The first type of proxy server, the one that handles an outbound request from a client, forwards it to the Internet, and returns the generated response to the client, is called a forward proxy. The second type of proxy server, the one that handles an incoming request from the Internet, forwards it to a backend worker, and returns the response to the Internet, is called a reverse proxy.

Forward proxies and reverse proxies have significantly different functions, but they both do the same fundamental action of serving as the proxy for a requester or responder. In both cases, the proxy server isolates the private network from the Internet, enabling you to take measures to improve security. In both cases, the proxy processes requests and responses, enabling it to perform operations on the traffic that can improve performance by using caching or compression, guard against attacks, and filter information.

ARR as a Forward Proxy

Httpd

When ARR serves as a forward proxy, it is part of an internal network (or intranet) of client computers. The proxy uses a URL Rewrite rule to pass requests from clients through to the Internet. ARR as a forward proxy can be used to improve bandwidth usage and performance by caching; however, it is not suitable as a full-fledged, commercial-grade forward proxy.

Note that ARR processes only HTTP traffic, not other protocols. ARR does not support the HTTP CONNECT verb, and as a result, does not support forwarding HTTPS traffic.

When it receives a request from one of the clients naming the target Web server, the forward proxy server processes the request as follows and forwards it through the firewall to the Internet:

  1. The forward proxy server receives the request from a client, and checks its validity.
  2. If the request is valid, ARR checks its cache to see if the response already resides there. If it finds the response, ARR returns it to the client without sending the request to the Internet.
  3. If ARR does not find the response in the cache, the proxy server sends the request through the firewall to an Internet connection, and to the content server that has the information.
  4. When the request is fulfilled by the content server, the response is returned over the Internet to the forward proxy server. ARR can be configured to cache the response.

The forward proxy provides the following advantages:

  • Improves performance and lessens network traffic by caching information that is requested regularly (if enabled). It caches the response for the first requester, and when subsequent clients request the same content, they are given the content from the cache. The response is not requested again from the content server.
  • Helps improve network security by ensuring that requests are valid.
  • Improves performance by using IIS compression (if enabled).
  • Supports filtering to ensure that policies are met, using URL Rewrite.

Installing and Configuring ARR as a Forward Proxy

Prerequisites

Httpd

To set up a forward proxy server using ARR, you must have the following:

  • IIS 7.0 or above on Windows 2008 (any SKU) or newer with Tracing role service installed for IIS.
  • Microsoft Application Request Routing Version 3 and dependent modules
  • Minimum of one worker server with working sites and applications.

Install ARR

If Application Request Routing Version 3 has not been installed, it is available for download here. The download site displayed by this link includes installation instructions.

Apache Forward Proxy Mod_rewrite

Install URL Rewrite

Install the URL Rewrite module for IIS through the Server Manager. For more information, see Installing IIS 8.5 on Windows Server 2012 R2.

Forward Proxy Server

Configure ARR as a Forward Proxy

Centos 7 Httpd Forward Proxy

To enable ARR as a proxy, and to create a URL Rewrite rule to enable ARR as a forward proxy, proceed as follows:

Mod_proxy Forward Proxy

Netscaler forward proxy

Httpd Forward Proxy List

  1. Open Internet Information Services (IIS) Manager.

  2. In the Connections pane, select the server.

  3. In the server pane, double-click Application Request Routing Cache.

  4. In the Actions pane, click Server Proxy Settings.

  5. On the Application Request Routing page, select Enable proxy.

  6. In the Actions pane, click Apply. This enables ARR as a proxy at the server level.

  7. To start the process of turning ARR into a forward proxy, click on the server node in the Connections pane.

  8. In the server pane, double-click URL Rewrite.

  9. In the Actions pane, click Add Rule(s).

  10. In the Add Rule dialog box, double-click Blank Rule.

  11. In the Edit Inbound Rule dialog box, enter 'Forward Proxy' for Name. In the Match URL area, enter the following:

    • Using: Wildcards
    • Pattern: *
  12. Scroll down to the Conditions area of the Edit Inbound Rule dialog box, and then click Add….

  13. In the Add Condition dialog box, select or enter the following:

    • Condition Input: {HTTP_HOST}
    • Type: Matches the Pattern
    • Pattern: *
  14. Scroll down to the Action area of the Edit Inbound Rule dialog box, and then enter the following:

    • Action Type: Rewrite
    • Rewrite URL: http://{C:1}/{R:0}
  15. In the Actions pane, click Apply.

    Note

    This rule enables HTTP messages to pass through the forward proxy. HTTPS (443) messages are not supported on this forward proxy because ARR does not support HTTP CONNECT.

  16. Configure the proxy settings as appropriate in your applications, browsers, etc.