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interference is large, and maintenance costs are also high.Using Wavelength Division multiplexing (wdm,wavelength-division Multiplexing) technology, the fiber can simultaneously transmit many different wavelengths (channels) of light, at the beginning of 2010, researchers have been able to coupling more than 400 wavelengths of light in each channel, Maximum capacity up to 171gbit/s, while the total bandwidth of a fiber can reach 70tbit/sLast kilometer delay-tracerouterBackbone lines can have te

version number (the entity value of the requested variable), and if the browser observes that the version ETag information for the file already exists, stop the file transfer immediately.Try to guess what "fbcdn.net" means in the address. The smart answer is "Facebook content distribution Network". Facebook uses content distribution networks (CDNs) to distribute static files like images, CSS tables, and JavaScript files. As a result, these files will be backed up in many CDN data centers around

conduit" that transmits light signals. Wire is used for transmitting electrical signals, but the signal loss, electromagnetic interference is large, and maintenance costs are also high.Using Wavelength Division multiplexing (wdm,wavelength-division Multiplexing) technology, the fiber can simultaneously transmit many different wavelengths (channels) of light, at the beginning of 2010, researchers have been able to coupling more than 400 wavelengths of light in each channel, Maximum capacity up t

time was spent on various elements on the download page, such as files, style sheets, scripts, and Flash. Instead of focusing on restructuring the system, it is better to distribute static content first. This not only greatly reduces the response time, but also facilitates the distribution of static content due to the presence of CDN. CDN is a collection of geographically distributed web servers for more efficient content publishing. Generally, the web server is selected for a specific user bas

network". Facebook uses content distribution networks (CDNS) to distribute static files like images, css tables, and JavaScript files. As a result, these files will be backed up in many CDN data centers around the WORLD.Static content often represents the bandwidth size of the site and can be easily replicated through a cdn. A third-party CDN is usually used by the Website. For example, Facebook's static files are hosted by akamai, the largest CDN pr

A demonstration of a more intuitive comparison between HTTP/2 and http/1.1 was discovered a few days ago, an official presentation by Akamai. Https://http2.akamai.com/demoHTTP/2 significantly improved performance compared to previous http/1.1.Also, HTTP/2 is using binary transfer, http/1.1 is text (string) transfer. The units for binary transfer are frames and streams. Frames make up a stream, while the stream also has a stream ID, so there is a multi

Article: Tiele CatJanuary 12, 2017Request let's encrypt issue SSL certificateThe service is provided by ISRG (Internet Security Research Group), a ISRG from a nonprofit organization in the state of California, USA. Let's Encrypt is supported by many companies and organizations such as Mozilla, Cisco, Akamai, Electronic Frontier Foundation and Chrome, and has grown rapidly.For domain name ownership verification, two ways are supported: placing temporar

the client to send the request, which is a shackle to meet the status of preload.the advent of HTTP 2.0 has greatly improved Web performance compared to HTTP 1.x. The network latency is further reduced on the basis of full semantic compatibility with http/1.1. For front-end developers, there is no doubt that the front-end optimization work is reduced. This article summarizes the basic technical points of the HTTP 2.0 protocol, contacts the relevant knowledge, and explores how HTTP 2.0 can impro

the client to send the request, which is a shackle to meet the status of preload.the advent of HTTP 2.0 has greatly improved Web performance compared to HTTP 1.x. The network latency is further reduced on the basis of full semantic compatibility with http/1.1. For front-end developers, there is no doubt that the front-end optimization work is reduced. This article summarizes the basic technical points of the HTTP 2.0 protocol, contacts the relevant knowledge, and explores how HTTP 2.0 can impro

geographic distribution, do not attempt to refactor the Web application to accommodate the distributed schema.Changing the schema will result in multiple recurring tasks, such as synchronizing session state and replicating database transactions between multiple servers.This attempt to shorten the user-to-content distance may be delayed or blocked by the application schema revision.We also remember that 80-90% 's end-user response time was spent on various elements of the download page, such as

backed up in many CDN data centers around the world.Static content often represents the bandwidth size of the site and can be easily replicated through a CDN. A third-party CDN is usually used by the website. For example, Facebook's static files are hosted by Akamai, the largest CDN provider.For example, you might get a response from a akamai.net server when you try to ping static.ak.fbcdn.net. Interestingly, when you ping again, the server may be di