What is the difference between ProxyPass and proxyreversepass?

What is Apache ProxyPass?

Apache has a useful feature to use as a front-end web server: a ProxyPass directive, which you can use to forward requests from your backend Apache server to an external web server.

In this tutorial, we'll look at some basic examples of ProxyPass, but also look at some real life examples, showing how you might use ProxyPass to improve your hosting costs or security.

How it works. The standard way of using ProxyPass is by setting the path to your web server in your Apache configuration file. In this example, we use /server/: ProxyPass /server/. You'll see that it acts as an intermediate proxy for all requests that go through it. You can also specify where requests are sent, to a different backend server instead of the backend you're passing through. In this example, the proxy passes requests to /backend/:

ProxyPass /backend/. What this means. You can use ProxyPass to do almost anything with Apache. Here's a small list of things you can do with ProxyPass: Redirect HTTP traffic to HTTPS. Redirect HTTPS traffic to HTTP. Forward all traffic to different servers. Redirect requests to a single URL path to different paths, based on headers. Forward requests to another server based on a list of headers. In this section we'll use one of the first three examples: forwarding to HTTPS. For example, you might want to forward requests for /api/request.json?someheader=hi to a different backend on the same machine. To do this, you need to create a new rewrite rule for /api/request.json)(. This matches everything after (api), up to request.json)(.

What is the difference between ProxyPass and proxyreversepass?

I think you want ProxyPassReverse which sets the server's IP address in the HTTP Host header.

The ProxyPass directive is used to change the request URL on the client before it is sent to the next proxy server in the chain. The request URL is changed based on the value of the server name or IP address specified in the Location directive.

The default behavior of this directive is to append a trailing slash to the target URL. This allows the URL to be used as a file system directory for serving the resource with a relative URI. For example, if the target URL is /foo/bar, the server returns /foo/bar/index.html. This allows the server to return a file in a directory and be aware of the final location of the client.

The ProxyPassReverse directive sets the server's IP address in the HTTP Host header. When the request is received by the server, the Host header is used to determine the location of the target resource. This allows a reverse proxy server to act as a cache of information and eliminate some requests.

How to set proxy in Apache?

I am new in Apache and I have to set proxy server in my apache web server.

I searched in the net for how to set the proxy server, but I didn't find any example. I just found some thing about using "setenv" option. But I don't know how to use it.

The Apache docs on Proxy support is comprehensive, so I won't repeat all of the relevant information. Instead, I'll refer you to that page and list below the settings that you may want to set.
(default is none). (default is none). The variables may not be set in all cases, and the default values will work fine.) That's all I could provide you with. You might want to read some tutorials on the subject of how Apache works.