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Notes on data Structures and Algorithms
Notes for geek Time iOS Developer Class
IOS large factory interview high frequency algorithm summary
Summary of iOS interview materials
Proxy server
- The characteristics of
- It doesn’t produce content itself
- The middle position forwards upstream and downstream requests and responses
- Downstream client: it is the server
- Upstream facing server: it is the client
Forward agent
- Forward proxy, the object of the proxy is the client
role
- Hide the client identity
- Circumventing firewalls (breaking access restrictions)
- Internet Access control
- Data filtering
The reverse proxy
- Reverse proxy, the object of the proxy is the server
role
- Hiding server Identity
- Safety protection
- Load balancing
Principles of the packet capture tool
- Charles packet capture tool principle: started in the client
Forward agentService.
Proxy server-related header fields
- Via: Append the host name (or domain name) of each proxy server that passes through
- X-forwarded-for: indicates the IP address of the appended request
- X-real-ip: indicates the Real IP address of the client
- 1
- X – Forwarded – For: 14.14.14.14
- X – Real – IP: 14.14.14.14
- Via: proxy1
- 2
- X – Forwarded – For: 14.14.14.14 220.11.11.11
- X – Real – IP: 14.14.14.14
- Via: proxy1, proxy2
- 3
- Via: proxy2
- 4
- Via: proxy2, proxy1
CDN
- Content Delivery Network (CDN) or Content Distribution Network
- Utilize the server closest to each user
- Faster and more reliable delivery of music, images, videos and other resource files (usually static resources) to users
Before and after using CDN
- CDN operators have set up computer rooms in major hub cities all over the country and even the world
- A large number of nodes with high storage and bandwidth are deployed to build a cross-carrier and cross-regional private network
- The content owner pays a fee to the CDN operator, which delivers its content to the end user
Before using a CDN
After using the CDN
