What is Proxy Server & How Proxy Server Works?. - arpanap

Sunday, December 1, 2019

What is Proxy Server & How Proxy Server Works?.


 What is Proxy Server & How Proxy Server Works?.

In a computer network, a proxy server is a service offered by any computer system
acts as an intermediary between two communicating parties, the client and the server.
In the presence of a proxy server, there is no direct communication between the client and
the server. Instead, the client connects to the proxy server and sends requests for
Resources such as a document, web page or a file that resides on a remote server. The
proxy server handles this request by fetching the required resources from the remote
server and forwarding the same to the client. What is Proxy Server & How Proxy Server Works?.

 How Proxy Server Works?
An illustration of how a proxy server works is shown below:
                                                   


As shown in the example above, the client connects to a web proxy server and
Makes a request for the resources in this case, "Sample.html") that reside on a remote
server (in this case, xyz.com), the proxy server forwards this request to the target server
Depending on the client, so as to fetch the requested resource and deliver it back to the
client. An example of a client can be a user operated computer that is connected to the
Internet. What is Proxy Server & How Proxy Server Works?.
 Types of Proxy Servers and their Uses:

1. Forward Proxies:
A forward proxy is the same one described above where the proxy server forwards
The client's request is to establish a communication between the two. Here
The client specifies the resources to be fetched and the target server to connect to, so that
the forward proxy server acts accordingly. Except for reverse proxy (discussed in the
The latter part of this article), all other types of proxy servers described in this article fall
under forward proxy. What is Proxy Server & How Proxy Server Works?.

2. Open Proxy:
An open proxy is a type of forwarding proxy that is openly available to any Internet user.
Most often, an open proxy is used by Internet users to conceal their IP address
They remain anonymous during their web activity. The following are some of the web
Proxies that fall under the category of open proxy:
Anonymous Proxy
An anonymous proxy is a type of open proxy that conceals IP addresses of Internet users
so that the target server cannot identify the origin of the requesting client. However, an
Anonymous proxy identifies itself as a proxy server but is still maintained
anonymity of the users. What is Proxy Server & How Proxy Server Works?.
Distorting Proxy
This type of proxy server identifies itself as a proxy, but reveals an incorrect IP address
of the client to the target server.
High Anonymity Proxy
An elite proxy provides maximum anonymity as it neither recognizes itself as a proxy nor
Reveals the original IP address of the client. In most cases, users have to pay for this type
of proxy as it is seldom available freely on the internet. What is Proxy Server & How Proxy Server Works?.

3. Reverse Proxy:
Unlike a forwarding proxy where the client knows that it is connecting through a proxy, a
A reverse proxy appears to be the client as a normal server. However, when the client
Requests resources from this server, it forwards those requests to the target server (actual
server where the resources reside) so as to fetch back the requested resource and forward
the same to the client. Here, the client is given an impression that it is connecting to the
The actual server, but in reality there exists a reverse proxy residing between the client and
the actual server. 
Reverse proxies are often used to reduce load on the actual server by balancing load
Enhance security and cache static content, so that they can be served faster to the client.
Often big companies like Google that get a large number of hits maintain a reverse
proxy so as to enhance the performance of their servers. It's not a surprise that ever
You are connecting to google.com, you are only connecting to a reverse proxy
forwards your search queries to the actual servers returning the results to you.
What is Proxy Server & How Proxy Server Works?.
                                     
                                                           www.arpanap.in

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