An Interesting Article About Proxy Site Working

proxy coding

If I access the A website through a proxy, for A, it treats the proxy as a client, completely undetectable of the real client, which achieves the purpose of hiding the client IP.

How The IP Changed By Using Proxy Site

Of course, the agent can also modify the HTTP request headers, by X-Forwarded-IPtelling a true client server IP such as custom head. However, the server can not verify that this custom header was actually added by the proxy or the client modified the request header, so extra care should be taken when getting the IP from the HTTP header field. This part can refer to my previous ” HTTP request header X-Forwarded-For ” article.

Explicitly designated browsers

Explicitly designated browsers to the browser, you need to manually modify the browser or operating system settings, or specify the PAC (Proxy Auto-Configuration, automatic configuration file) automatically set, and some browsers support WPAD (Web Proxy Auto discovery Protocol, Web Proxy auto-discovery protocol). Explicitly specify the browser proxy This method is generally called forward proxy, the browser enables the forward proxy, the HTTP request message will make some changes to avoid some of the problems of the old proxy server, this part can refer to My previous ” Http request header Proxy-Connection ” this article.

Resolution To The Proxy Server IP

Another situation is that when visiting A website, the actual visit is the proxy. After the proxy receives the request message, it sends a request to the server that actually provides service, and forwards the response to the browser. This situation is generally referred to as reverse proxy, which can be used to hide server IP and port. After the general use of reverse proxy, you need to resolve the DNS domain name resolution to the proxy server IP, then the browser cannot detect the existence of the real server, of course, do not need to modify the configuration. Reverse Proxy is the most common way to deploy a Web system, such as this blog is to use Nginx’s proxy_passfeatures will forward the request to the browser behind Node.js service.

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Coding

After the above code is run on the local 8888open port for the HTTP proxy service that parses the request URL and other necessary parameters from the request message, the new request to the server and forwards the request agent received a new request, final Then the server response back to the browser. Modify the browser’s HTTP proxy to 127.0.0.1:8888access the HTTP Web site and then, agents can work properly.

However, after using proxy site, the HTTPS website is completely inaccessible. Why? The answer is very simple, this agent provides HTTP service, and there is no way to carry HTTPS service. So whether this proxy to HTTPS on it? Obviously not, because the essence of this proxy is a middleman, and HTTPS site certificate authentication mechanism is hijacking nemesis nemesis. In normal HTTPS service, the server does not authenticate the client’s certificate. The middleman can successfully complete the TLS handshake as the client and the server. However, the middleman does not have the private key of the certificate. In any case, the server cannot establish a TLS connection with the client. Of course, if you have a certificate private key, the proxy certificate corresponds to the HTTPS website of course no problem.

What is Proxy Site and How It Works?

proxy linkage

What is Proxy site?

Web Proxy Server, known as an online proxy or online proxy. Web page proxy is a child of proxy server program running on the web page.

Without any setting, the advantages of accessing the Web server by selecting the Web address have become the most popular proxy access method nowadays.

A web proxy is a common child of the agent. The web proxy provides the client with a cache of web pages and files on the remote site so that the client can browse the remote site more quickly and securely.

Some web proxy sites keep updating daily to ensure speed.

Is Proxy Is A Middle Linkage For Boosting Web Speed?

Web proxy principle is to receive the browser to the remote site browsing time, the agent started to look at the current server cache Web site is returned to the user’s browser client.

If the current server does not cache the remote server, the agent automatically reads the remote site, submits the data to the client, and caches the data for the next browsing requirement.

The agent automatically deletes the cache based on cached time, size, and fetch records.

There are two ways to delete, one is to delete the oldest data, and one is to delete the least extracted cache. These two methods can, therefore, be used in combination.

Web proxies use different and complicated scripts to bypass filters and firewall websites.

Users using online proxy services are very simple, do not need to be a browser, and do not need to install additional software, just visit the online acting websites, and then you can enjoy free agency services.

In mainland China, some sites are blocked, web proxy access can be viewed.

Advantages of Web Proxy

A web proxy is a web proxy with the function of the anonymous proxy server. When an online proxy is running on the server, the web proxy can be used as a springboard to surf the Internet. It does not only make the Internet more secure.

The web proxy can filter the content of remote sites. Some censorship software is similar to the web proxy.

For some purposes or protection, some web agents are so far the content of the site. For example, Skweezer can reschedule pages to provide browsing for mobile and PDAs.

Network administrators thus often use agents to prevent virus and reaction site content.

These programs are usually written in PHP or CGI programming language. An agent written by CGI is often used to break the network blockade of a company or school.

Agents wrote through CGI hide the client’s IP, so users can anonymously access remote sites.

The proxy written by PHP uses 64-bit encryption technology, uses the fsockopen function to access the target URL through the HTTP access class, and then processes the HTML code and prefixes each link thereafter And CSS, Javascript files.

Through some web proxy download software, you can filter out some dangerous files containing viruses and Trojans, which can make the browsing experience more secure.