An Introduction About Proxy Server

proxy servers

Proxy / proxy server

A proxy is a service that serves as a cache within a network to service accesses to always the same data and files from memory.

The term proxy refers to a server or service running on a server. The proxy service is a program that works in the background on a server.

Proxy means proxy. In the simplest case it is a kind of cache for websites. He accepts requests from clients and evaluates them. As a representative, he forwards the request to the Internet.

The returned data is stored by the proxy before forwarding. In the case of another request for the same destination, the data is not downloaded from the Internet, but sent directly from the proxy memory to the recipient. In this way, traffic to the Internet is saved. This reduces costs and increases bandwidth for other applications.

Standard Proxy

The clients do not send their access directly to the internet, but to the proxy. This server acts as a mediator to connect to the web server. Frequent Internet pages or downloads then no longer need to be re-transmitted over the Internet, but can be sent directly from the proxy server to the clients. This reduces data traffic to the Internet and returns the data to the clients faster.

Reverse Proxy

The reverse proxy works the other way around and is similar to load balancing. For example, the clients access the Internet without a proxy. A group of web servers is hidden behind a proxy. The web servers are not directly accessible.

The proxy does not forward frequent identical accesses from the Internet to the web server, but works it off itself if it has cached the data.

So a simple load distribution is possible, without expensive or complicated load balancing. Reverse proxies can also prevent unauthorized access.

In another application, the access authorization for multiple servers is handled centrally by a proxy.

Advantages

  • Faster access to always the same data
  • Cost savings on Internet traffic
  • Integration of virus and spam filters possible

A proxy provides more protection for systems that communicate through a proxy rather than directly to the Internet.

Unnecessary packets from external computers no longer reach the local network because the proxy can only forward accesses from the Internet if an outgoing connection has previously existed.

In addition, a virus filter can be installed on the proxy. To be able to work effectively, every internet access must be done via the proxy. This is achieved by the fact that the default gateway is not the router to the Internet, but an upstream proxy.

Disadvantage

  • Cache coherency due to outdated content in the cache
  • Not every application supports proxies
  • There are not proxies for every Internet protocol

The disadvantage of proxies is that a proxy must be installed for each Internet protocol if all the traffic is to be handled via the proxy server.

This means the proxy program must be able to handle all the possible protocols that the Internet has to offer. It’s not enough just to support HTTP to access web servers. Also POP and SMTP for the E-Mail communication must be mastered.

Typically, the programs on the clients must support traffic through a proxy. This is not a problem with simple Internet services, such as WWW and e-mail. But online games and P2P file sharing will be difficult or not work at all.

Conclusion

Proxies have been a means for Internet service providers to save traffic in the early days of the commercial Internet.

At that time, the Internet connections were even slower and more expensive. In addition, many Internet users were still on the road with a modem or ISDN card. To deliver the data faster, proxies have been set up to serve customers faster and save traffic.

Meanwhile, the network expansion of the Internet is designed very generously, so that a proxy offers no benefits.

Exceptions are transitions from local networks to the Internet, where a proxysite is used for security reasons. On the one hand, to limit the possibilities of the users.

And second, to check traffic for malicious content, such as viruses and worms. It’s usually about protecting the local network.

What Are The Major Eye Blindness Symptoms

eye blindness symptoms

Eye Blindness Symptoms

If vision loss develops within minutes to days, it is considered sudden. It may affect single or double eyes, all or part of the field of vision.

Only a small fraction of the visual field is lost (for example, due to a small retinal detachment) may be blurred vision. Other symptoms, such as eye pain, may occur as a result of vision loss.

There are three common causes of sudden loss of vision:

  • The turbidity of normal transparent eye structure
  • Retinal (photosensitive structure at the back of the eye) abnormal
  • Nerve abnormalities (optic nerve and visual pathways) that transmit visual signals from the eye to the brain.

Light is passed through several transparent structures before it is felt by the retina. First, light passes through the cornea (the iris and the clear layer in front of the pupil), then the lens, and then the vitreous (gel-like substance that fills the eyeball).

Most diseases, when they affect the entire eye, cause complete loss of vision, and may also affect only the parts of the eye.

When the visual pathway is damaged

The nerve signals of the left and right eyes are in line with the corresponding optic nerve fibers. The two optic nerves converge at the chiasm.

The nerve signals of the left and right eyes were respectively taken along the corresponding optic nerve fibers.

After convergence at the optic chiasm, the optic nerve fibers were crossed to the opposite side and half were extended to the same side of the brain or hyperopia definition.

Due to this arrangement, the brain receives information through the left and right visual nerves. There are differences in the types of visual fields.

Principles And Causes Of Blindness 

Anything that blocks light in the environment from entering the eye or disturbing nerve impulses from the back to the brain can interfere with vision.

Legal blindness means that even after correction by spectacles or contact lenses, the visual or visual clarity of the eye is 20/200 or worse, or the visual field is limited to less than 20 °.

Many people who are considered legally blind can distinguish between shapes and shadows.

Blindness can occur in the following situations:

  • Light cannot reach the retina.
  • Corneal damage caused by infection, such as keratoconjunctivitis of herpes, or infection caused by long-time contact lenses, causing corneal scarring
  • Vitamin A deficiency leads to dry eyes, corneal softening, etc., corneal scarring occurs
  • Severe trauma damages the cornea leading to corneal turbid scar formation
  • Cataract causes crystal clarity to decrease
  • The light does not focus properly on the retina.
  • Severe refractive errors, frame glasses or contact lenses cannot be corrected.
  • The retina does not sense light properly
  • Retinal detachment
  • Diabetes
  • Macular degeneration
  • Retinitis pigmentosa

History, Origin, And Development Of The Fast Food Industry

In a sense, fast food is regarded as a mark of modern culture. Between different cultures, the contents of fast food are similar.

Modern Fast Food Industry Is Associated With Hamburger

There are stalls selling bread and olive oil in the ancient Roman cities. In East Asia, In the Middle East, it may be a stall selling flat bread, salads, and sandwiches.

The origin of modern fast food is usually associated with Hamburger because the earliest fast-food restaurant was Hamburg as its main product.

The earliest fast-food restaurant was the White Castle in the United States. It appeared in 1921 when the price of a hamburger was five cents.

Later, the White Castle made five small holes in the hamburger patties, which increased the heated surface area, made the meat cooked faster, and the cooking time needed to be was shorter.

White Castle is an ancestor of the fast food industry and has also spawned numerous competitors.

The common point between the two is the use of industrial production, the use of assembly line processing, pre-prepared frozen meals, cooking and delivery of ready-made ingredients, disposable tableware, condiments, etc.

At the same time, meals will be separated for guests to choose their own dishes. 24hr Restaurants Near Me, is characterized by being taken directly from the counter or simply handled and eaten, even heated by a microwave oven.

East style fast food and Western fast food

Unlike western fast foods, Chinese and Japanese fast foods have soup, which is usually eaten using chopsticks and spoons, but it is also common to eat rice wrapped directly. Traditionally, the production of East-style catering is complicated.

When the chef prepares the ingredients for cooking, they often have to sit in the seat for a long time before they can serve. However, fast food does not need to wait for food production time and is efficient.

In the Asian countries, along with the forming society of the 20th century, the modern fast-food eating patterns, such as Chinese snack, Taiwan’s braised pork rice, Hong Kong-style fast food, Japan’s donburi, Korea and other delivery services.

After the 1990s, some of the Oriental fast food companies were dedicated to researching improved dishes, ingredients and cooking methods to make healthy and diversified snack foods and beverages.

Feeding And Selection Of Dogs

How To Select And Feed The Pet Dog. 

In this high-speed, stressful society, if you want to reduce your own pressure and improve your work efficiency, we suggest you try a pet dog, it will bring you a lot of fun, and some will be the effect of treating diseases is, of course, different from person to person.

When you consider a pet dog as your closest friend, however the German Longhaired Pointer is also an ideal dog. you will feel this way. For some elderly people who have no children at home and can be accompanied by lonely old people, you can feed pets and dogs because it can make your life more fulfilling and relieve your sense of loneliness.

Having your own children raise animals can cultivate their sense of responsibility and love for animals.

When your pet dog has been with you for many years, you will treat it as a loved one and cannot bear it.

Dogs can promote better communication and communication between people.

So add a new member to your own family.

The dog can be our most faithful friend. It can be a good talker or a good companion.

Make your life more fulfilling and let yourself have a companion.

Suitable Domestic Pet Dog Breeds

There are thousands of dogs in the world, but they are suitable for family rearing. There are more than 300 kinds of docile dogs.

Types Of Dogs

  1. Tibetan mastiff
  2. huskies,
  3. golden retriever
  4. Samoyed
  5. Labrador
  6. Schnauzer
  7. Chihuahua
  8. German Shepherd
  9. Bichon Frise
  10. Chow Chow
  11. Poodle
  12. Belington
  13. Border Collie
  14. Scottish Shepherd
  15. Toy Poodle.

Tips For Picking Up A Right Dog:

When you buy a dog, don’t immediately pick it up and watch it quietly to observe its actions and postures. Those downcast dogs are not worth buying.

  • Do not choose dogs that are too fat and have a too large belly;
  • Don’t buy hair that is knotted or has hair removal.
  • Do not buy dry nose or a runny nose;
  • Excessive whitening, white or dirty eyeballs, and many eyelid secretions are unhealthy.
  • Don’t buy dogs with the odor on the ear canal, dander on the ear tip, or frequent flings;
  • The gums and tongue ruddy are healthy and do not buy bad breath;
  • Do not buy hard skin and hypertrophy;
  • Pay special attention to the underside of the dog. If “yellow seal” is a sign of recent diarrhea or diarrhea, do not purchase it;
  • Skull, maxilla, mandible, then move along the back of the cervical vertebrae and feel the vertebrae and limbs deformed do not buy;
  • Do not buy foot pads dry and hard;
  • Do not buy a dog that is surprised by a surprise.

Hair Straightener Is The Modern Flat Iron

 

What Is The Function Of Hair Iron?

hair iron

The smoothing of curly or wavy hair is done by thermal ironing with a hair straightener – also called flat iron. The straightener used to be made of bare iron according to the old scissor-like design.

Its jaws were moderately heated by metered depositing on a stove top. Today hair straighteners are heated electrically.

Temperature Setting Of Hair Iron

The target temperature of 80 to 230 ° C is achieved by adjustable thermostat, but usually by a self-regulating heating element, which accepts mains voltage of 100 to 240 V.

The heated surfaces are from 15 mm × 60 mm in size, the heating power is depending on the size and regulation 25 to 170 W. Switch and possibly existing thermostat knob can be accommodated adjustable in the nipper gap, the power cable hinged.

In most cases, the device is designed like a pair of pliers, with the plier’s jaws being elongate flat hot surfaces of metal (anodized aluminum, possibly additionally lubricious coated) or ceramic.

Working Principle Of Hair Iron

The working principle Best Flat Iron for Natural Hair is as follows: Put and take a strand of hair in the “pliers” and leads the smoother under the pull of the frictional force to the hair tips. The straight stretching under heating has a smoothing effect on the hair.

There are plier’s jaws that must be pressed against gentle suspension constantly with manual force against the strand of hair.

On the other hand, self-closing pliers have a reversed and stronger spring that compresses the hair cheeks and then an inclined lever button that opens on the pressure with index and middle fingers, the jaws to accommodate a new strand.

For the – gentle on the hair roots – gentle function is a low coefficient of friction between – rounded at the edges – baking surfaces and the hair, as well as the manual decrease in press force when the hair strand to the hair strand contains only a lot less hair.

Shaft attachments for the flat jaws have the opposite effect. Some hair straighteners are equipped with comb teeth and with heated, curved outer surfaces that allow the curl of hair.

In addition to the ordinary flat iron, there is the smoothing brush. It is also called a hair straightener brush. The advantage over the straightener is above all the simple application. [1] You brush your hair with it like a regular hairbrush while smoothing it out.

Air Compressor Working Principle

Air compressors are of many types here we discuss some of them and their working principle.

air compressor

Piston-Type Oil-Free Air Compressor Unit

Piston by the oil-free air compressor drive system, compression system, cooling system, lubrication system, control system and security system.

Compressors and motors bolted to the base, the base with anchor bolts fixed on the basis.

During operation, the motor directly drives the crankshaft through the coupling and drives the connecting rod, the cross head and the piston rod so that the piston reciprocates in the cylinder of the compressor to complete the process of inhalation, compression and discharge.

The machine is a double-acting compressor, that is, the piston up and down the air intake, compression and discharge.

Screw Air Compressors

Screw air compressor driven by the screw head, the motor, oil separator barrel, the cooling system, air conditioning system, lubrication system, and a valve control system components.

The machine is installed in a box, self-contained, directly on the flat cement floor can be, without the need to anchor bolts on the foundation.

Screw head is a kind of double-axis displacement rotary compressor head. 1 pair of high-precision main (male), sub (female) rotor mounted horizontally and parallel inside the chassis, the main (male) rotor has 5 teeth, while the Vice (negative) rotor has 6 teeth. The main rotor diameter, deputy rotor diameter is small.

Tooth formation spiral, both inter meshing. Both ends of the main rotor and the auxiliary rotor are respectively positioned by bearings.

Working motor directly through the coupling (or belt) with the main rotor, the two rotors inter mesh with each other, the main rotor directly driven with the deputy rotor rotation.

The coolant is sprayed directly into the rotor meshing part from the nozzle at the lower part of the compressor housing and mixes with the air to remove the heat generated by the compression to achieve the cooling effect.

At the same time, a liquid film is formed to prevent direct contact between the rotor and the metal and to close the gap between the rotor and the casing.

Coolant

Sprayed coolant also reduces the noise generated by high-speed compression.

The main components of screw air compressor screw head, oil and gas separation barrel. Screw head suction through the suction filter and the intake control valve, while the oil injected into the air compression chamber, the head cooling, sealing and screw and bearing lubrication, the compression chamber produces compressed air.

After compression,  OR best portable air compressor  resulting gas-oil mixture is discharged into the oil-gas separation tank. Most of the oil is separated from the oil-gas mixture due to mechanical centrifugal force and gravity.

Air passes through the oil and gas separation cartridge made of borosilicate glass fiber and almost all of the oil mist is separated. The oil separated from the oil separator is returned to the screw head through the return pipe.

The oil return pipe is equipped with oil filter, oil return through the oil filter, the clean oil flow back to the screw head. After the oil is separated, the compressed air leaves the reservoir through the minimum pressure control valve and enters the after cooler.

After the cooler cooling the compressed air discharged to the gas tank for each gas unit. Condensation of water concentrated in the gas tank, through automatic drainage or manual discharge.

Air Compressor Working Principle

Air compressor are of different types, here describe some of their types and functions.

air compressor

Piston-Type Oil-Free Air Compressor Unit

Piston by the oil-free air compressor drive system, compression system, cooling system, lubrication system, control system and security system.

Compressors and motors bolted to the base, the base with anchor bolts fixed on the basis. During operation, the motor directly drives the crankshaft through the coupling and drives the connecting rod.

The cross head and the piston rod so that the piston reciprocates in the cylinder of the compressor to complete the process of inhalation, compression and discharge.

The machine is a double-acting compressor, that is, the piston up and down the air intake, compression and discharge.

Screw Air Compressors

Screw air compressor driven by the screw head, the motor, oil separator barrel, the cooling system, air conditioning system, lubrication system, and a valve control system components.

The machine is installed in a box, self-contained, directly on the flat cement floor can be, without the need to anchor bolts on the foundation.

Screw head is a kind of double-axis displacement rotary compressor head. 1 pair of high-precision main (male), sub (female) rotor mounted horizontally and parallel inside the chassis, the main (male) rotor has 5 teeth, while the Vice (negative) rotor has 6 teeth.

The main rotor diameter, deputy rotor diameter is small. Tooth formation spiral, both inter meshing. Both ends of the main rotor and the auxiliary rotor are respectively positioned by bearings.

Working motor directly through the coupling (or belt) with the main rotor, the two rotors inter mesh with each other, the main rotor directly driven with the deputy rotor rotation.

The coolant is sprayed directly into the rotor meshing part from the nozzle at the lower part of the compressor housing and mixes with the air to remove the heat generated by the compression to achieve the cooling effect.

At the same time, a liquid film is formed to prevent direct contact between the rotor and the metal and to close the gap between the rotor and the casing.

Sprayed coolant also reduces the noise generated by high-speed compression.

Main Components Of Screw Air Compressor

The main components of screw air compressor screw head, oil and gas separation barrel.

Screw head suction through the suction filter and the intake control valve are the best portable air compressor, while the oil injected into the air compression chamber, the head cooling, sealing and screw and bearing lubrication.

The compression chamber produces compressed air. After compression, the resulting gas-oil mixture is discharged into the oil-gas separation tank.

Most of the oil is separated from the oil-gas mixture due to mechanical centrifugal force and gravity. Air passes through the oil and gas separation cartridge made of borosilicate glass fiber and almost all of the oil mist is separated.

The oil separated from the oil separator is returned to the screw head through the return pipe. The oil return pipe is equipped with oil filter, oil return through the oil filter, the clean oil flow back to the screw head.

After the oil is separated, the compressed air leaves the reservoir through the minimum pressure control valve and enters the after cooler. After the cooler cooling the compressed air discharged to the gas tank for each gas unit.

Condensation of water concentrated in the gas tank, through automatic drainage or manual discharge.

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.

youtube-chain

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.

The Arrival of the New Year 2018

happy new year wishes

How to Celebrate New Year

Happy New Year 2018 Quotes, Greetings, Messages, and Greetings: New Hope, Happy New Year, Happy New Year, Happy New Year, Happy New Year, Love, Peace and Success, New Aspiration, New Resolution, New Happy New Year Think of ways to create a better place.

happy new year 2018 wishes

So it’s not just a “New Year 2018” but it’s not something that cannot be explained in the language. Happy New Year 2018 Greetings, Short New Year Resolutions Your Friend and Family as Your Facebook and Twitter on the Best Friend on Web Site

New Year 2018 is happy with your family, friends, and loved ones and close ones, then you are among happy people.

People want to quote with people to share this Happy New Year 2015, they can be your parents, family, friends, husband, wife, kids or anyone else

Quotes for quotes for Happy New Year 2018 greeting messages and greetings family, short fun New Year friends and romantic New Year 2018 love messages and quotes for couples (girlfriend and boyfriend).

So welcome to the Happy New Year in 2014 with a smile, 2017 for the inspiration and inspiring New Year 2018 text message sharing and blessing for others.

The New Year 2018 greetings, quotes and messages

New Year 2018 Funny quotes on social media sites like Twitter, Facebook and WhatsApp 2018 Eve party or a happy new year 2018 wants to work away from you with your friends, office colleagues, and relatives.

Happy New Year 2018 greetings & message finally, we want to bring you all the best you can and do not miss New Year 2018 Wishes quotes and greeting SMS in English.

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.