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There are several ways to use proxy between public network and private network: HTTP proxy server: This is a common proxy method, and an HTTP proxy server can be set in the browser to realize the forwarding of network access. The specific setting method will vary according to different browsers. For example, in IE, you can set it through "Tools /Internet Options …", while in Firefox, you can set it through "Tools/Options …". In addition, you can also use some browser extensions to realize fast proxy switching, such as QuickProxy and AutoProxy. VPN (Virtual Private Network): VPN is a technology to establish a private data communication network in a public network, which can provide a secure data transmission tunnel service for enterprises or individuals. VPN can be divided into intranet VPN, remote access VPN and extranet VPN, which are classified according to their different functions. The realization of VPN depends on tunnel protocols, such as PPTP, L2TP and IPSec. NAT (Network Address Translation): NAT technology allows an entire organization to share a public IP address, while each internal device has a private IP address. Through NAT technology, devices in private networks can access public networks, while users in public networks cannot directly access devices in private networks unless through port mapping technology.  Port mapping technology: Port mapping is a kind of NAT, which can map a port of an external network host to a specific port of a machine in the internal network, so as to realize the access of the external network to specific services in the internal network. This is very useful when you need to access the intranet server from the public network. Manually set the proxy: In Windows system, you can manually configure the proxy server through "Network and Internet" settings in Control Panel. In Linux system, you can set the proxy IP by modifying the network configuration file. Browser proxy settings: For example, in Microsoft Edge browser, you can enter the system configuration page through the browser's Settings menu and find "Open computer proxy settings" to configure the proxy server. Mobile VPN solution: For example, the mobile VPN solution released by Huawei can meet the needs of enterprise users for safe and convenient access to public networks and campus intranets anytime and anywhere, and has the characteristics of excellent experience, easy connection and high reliability. Reverse proxy configuration: For example, using Nginx for reverse proxy configuration, you can access your own server or website from the public network. This usually involves editing configuration files and setting related services. VPN configuration of Mac system: VPN configuration in Mac system can be realized by officially recommended software or manual configuration to improve the security in public Wi-Fi environment. Detailed analysis of VPN: VPN technology can realize safe and private data transmission on public network, and its core is to build a logical dedicated data channel, which has high security and privacy and can only be used by authorized users. These are some common ways to use proxies between public and private networks. Each method has its own applicable scenarios and advantages, and users can choose the appropriate agent method according to their own needs and environment.

Sports shoes proxy is an advanced proxy server, which is designed for online snapping up limited edition sports shoes. They help users bypass the retailer's IP detection mechanism by providing new IP addresses, thus increasing the chances of successful purchase. These proxy servers usually have the following characteristics:  1. High-speed optimization: ensure that the user's purchase request can be quickly sent to the retailer server during the release of sports shoes.  2. Use of residential IP: adopt residential IP address to simulate the network connection of normal consumers, and reduce the risk of being detected and blocked. 3. Robot integration: Cooperate with the automatic snapping robot to realize an efficient order submission process. 4. High anonymity: provide a high level of anonymity protection to prevent the real identity of users from being recognized by online retailers. Sports shoes proxy occupies an important position in the current limited sports shoes market. Due to the scarcity and high demand of limited edition sports shoes, these agency services provide users with significant competitive advantages:  Sports shoes proxy enable users to take an advantage in the competition with other consumers and professional buyers, and improve the chances of obtaining their favorite shoes. By constantly changing the IP address, the retailer's IP blocking strategy is effectively circumvented, and the user's purchase opportunity is guaranteed. Agency services usually cover many regions around the world, enabling users to participate in the release of limited edition shoes in different regions. With the growth of market demand, sports shoes proxy service providers constantly introduce new technologies and optimize services to meet the diverse needs of users. The sports shoes proxy has been specially optimized to ensure that the user's purchase request can be passed quickly during the release of high-demand sports shoes. This high-speed performance is one of the key characteristics of sports shoes proxy, because they usually need to process a large number of requests in a few seconds. For example, the sports shoes proxy can reduce the delay and provide a response time close to the retailer's server, thus improving the chances of users successfully purchasing limited edition sports shoes. Sports shoes proxy usually use residential IP addresses, which look like the connections of ordinary consumers, so it is more difficult for retailers to identify and block these proxy. The use of residential IP reduces the risk of being detected by online retailers, because they come from real home networks rather than data centers, which makes proxy traffic look more natural and less suspicious. The integration of sports shoes proxy and automatic purchasing robot is another significant advantage. These agents can work seamlessly with robot software to automate the whole purchase process, thus handling multiple tasks and requests when sports shoes are released. This integration ensures that users can try many times on different websites at the same time, which greatly increases the chances of successful purchase. High anonymity is an important feature provided by sports shoes proxy, which ensures that users' online identities remain hidden and avoids being detected by retailers using proxy. By hiding the user's real IP address and browser fingerprint, the sports shoes proxy helps the user to bypass the retailer's anti-robot and anti-agent measures, so that the user can make a purchase attempt without being discovered. This anonymity is crucial to gain an advantage in the sale of limited edition sports shoes with fierce competition.

Choosing the right proxy IP is very important for the crawler, which can not only improve the efficiency of the crawler, but also effectively protect the identity of the crawler and avoid being banned by the target website. The following are some key factors to consider when choosing a proxy IP: Types of proxy IP: Understand the basic types of proxy IP, including transparent proxy, anonymous proxy and stealth proxy. For reptiles, stealth agent is the best choice, because it can protect the identity of reptiles to the greatest extent. Quality and performance: Choosing high-quality proxy IP should have the characteristics of stability, high speed and low latency. You can choose a proxy IP with stable quality by checking the reputation of proxy service providers and user evaluation. Geographical location: If your crawler needs to capture data in a specific area, it is very important to choose the proxy IP of the corresponding area. This can not only improve the crawling efficiency, but also obtain more accurate data. Anonymity: High stealth proxy IP can completely hide the real IP address and protect the identity and privacy of the crawler. Choosing a stealth proxy IP can effectively avoid being recognized as a crawler by the target website and reduce the risk of being blocked. Testing the availability and reliability of proxy IP: It is very necessary to conduct a comprehensive test of proxy IP before it is officially used. The test content includes speed test, anonymity test and stability test. Price and cost performance: When choosing a proxy IP, you need to weigh it according to your own needs and budget, and choose a proxy service with high cost performance. You can reduce the cost by purchasing multiple proxy IPS or using proxy pools.  Precautions: When using proxy IP, we should pay attention to such issues as regular replacement, limiting concurrent requests and avoiding using free proxy IP, so as to reduce the risk of being blocked. Service provider's credibility: When choosing an agent IP service provider, please be sure to consider its credibility and reputation. Choose those service providers who have good customer support and provide IP quality assurance to ensure timely help and support in the use process. Dynamic IP rotation: building a dynamic proxy IP pool to automatically rotate to another proxy when the proxy fails can significantly improve the stability and crawling efficiency of the crawler. Practical advice: In practice, you can choose the appropriate proxy service provider and proxy IP type according to your own needs and budget. At the same time, we also need to pay attention to the quality and performance, geographical location, anonymity and price of proxy IP, and regularly check and update the proxy IP pool. By comprehensively considering these factors and fully testing, you can choose the proxy IP service that best suits the needs of your crawler project. Remember, the best choice is often to find a balance between performance, reliability, cost and specific requirements.

Effective connectivity is an important index to measure the availability and stability of proxy servers, which reflects the proportion of successful connections established by proxy servers in a period of time.This ratio is usually expressed as a percentage, such as 95% or 98%. High effective connectivity means that proxy servers can successfully establish connections in most cases and provide stable proxy services. In practical application, the calculation method of effective connectivity rate is relatively simple, usually by sending multiple requests to the proxy server, and then counting the number of successful connection establishment and the total number of requests, dividing the number of successful connections by the total number of times and multiplying by 100% to get the effective connectivity rate.For example, if 100 requests are sent to the proxy server within an hour, and 95 requests are successfully connected, then the effective connectivity rate is 95%. The level of effective connectivity directly affects the quality of proxy services. A high effective connectivity means that when users use proxy services, they can complete network requests more smoothly and reduce the interruption or delay caused by connection problems.In addition, high effective connectivity can also help protect users' privacy and data security, improve network access speed and improve user experience. When evaluating the effective connectivity of IP agents, we should not only consider the connectivity of a single agent IP, but also consider the average effective connectivity and the change of connectivity, which is helpful to understand the overall performance and stability of agent services.At the same time, selecting high-quality proxy service providers, regularly monitoring and testing proxy servers and rationally configuring proxy settings are all key factors to maintain high effective connectivity.  It is worth noting that the effective connectivity rate is not equal to the service success rate.The effective connectivity rate only refers to the probability of successful connection, while the service success rate refers to the proportion of successful service requests and required information after successful connection. Therefore, even if the effective connectivity rate of proxy IP is high, there is no guarantee that the service request will be successfully completed. When choosing proxy IP, users should fully understand and distinguish these two concepts to ensure that they can get the proxy service that meets their needs.

API proxy is an intermediate server between client and server, and its function is to transfer and forward data between client and API server. Simply put, it acts as a "transit station", receiving API requests sent by clients and forwarding them to API servers. Similarly, when the API server returns a response, the API proxy is also responsible for passing the response back to the client. The main purpose of API proxy is to enhance the performance, security and reliability of API. It can cache requests, reduce the load on the API server and improve the response speed. At the same time, API agents can also monitor and check API requests to prevent malicious requests and attacks. There are some significant differences between API proxy and traditional HTTP proxy in function and application. API proxy is mainly used to connect and call various APIs to realize data exchange and function expansion between applications, while traditional HTTP proxy is mainly used for web browsing and visiting traditional websites. The data exchange format of API proxy is usually API data format such as JSON or XML, while the data exchange format of traditional HTTP proxy is usually standard Web data format such as HTML or JSON. API agents are widely used in various business scenarios, such as crawler business, network security, prevention of network attacks, cross-border e-commerce and financial services. Using API interface of API proxy can improve access stability and success rate, protect privacy and data security, break through geographical restrictions and price discrimination, and deal with anti-crawler strategy and network security threats. The API interface of API agent can quickly and automatically obtain the IP address of the agent, which avoids the tedious process of manual search and configuration and saves time and energy. The API interface can obtain the latest proxy IP list in real time, and keep the IP pool updated and available. In addition, the API interface provides flexible management and configuration options, and users can obtain specific types, quantities and regions of proxy IP through the API interface according to their own needs, thus achieving accurate proxy IP management. When using API proxy, it is necessary to call according to API documents and specifications, and identity authentication and authorization are usually needed to ensure the security and legality of proxy IP resources. Developers also need to pay attention to the frequency and limitations of API calls to avoid excessive load on proxy servers. In a word, as an important digital tool, API agent can help enterprises realize digital transformation quickly and improve their competitiveness and business innovation ability.

SOCKS5 and SOCKS4 are two commonly used proxy protocols that have some key differences in terms of functionality and security. First, SOCKS5 is a newer and more powerful protocol that supports not only the TCP protocol, but also the UDP protocol, which allows SOCKS5 proxies to be used in a wider range of network application scenarios, including those that require the UDP protocol, such as online gaming, voice calls, and so on. In contrast, SOCKS4 only supports the TCP protocol, which means it cannot handle UDP-based network traffic. In terms of authentication, SOCKS5 provides richer authentication options, including no authentication, username/password authentication, and more advanced authentication mechanisms (such as GSS-API, etc.). This flexible authentication mechanism enhances the security of the proxy service and allows users to configure it according to their actual needs . SOCKS4, on the other hand, only supports simple username/password authentication when establishing a connection, and this authentication is usually not mandatory. In addition, SOCKS5 supports server-side domain name resolution, i.e., the proxy server can handle domain name resolution requests and convert the domain name to an IP address, which reduces the burden on the client and improves the efficiency and security of the connection. On the contrary, SOCKS4 does not support domain name resolution and can only handle IP addresses, which means that when using a SOCKS4 proxy, if the target address is a domain name, you need to perform domain name resolution on the client first, and then send the resolved IP address to the proxy server. In terms of security, the SOCKS5 proxy is relatively secure due to its multiple authentication mechanisms, support for server-side domain name resolution, and higher connection stability. On the other hand, SOCKS4 is less secure due to its limitations in authentication and domain name resolution. Overall, SOCKS5 proxy is better than SOCKS4 proxy in terms of function, performance, security and scalability. Therefore, in practical applications, users should choose the appropriate proxy protocol according to their needs to protect their privacy and security, and improve the efficiency and stability of network applications.

Comparison of Encryption LevelHTTP proxies do not encrypt data when handling data transfer. This means that all data passing through the HTTP proxy exists in plaintext and is susceptible to listening and tampering by third parties. For example, according to one study, the interception rate of data packets can be as high as 70% when using an HTTP proxy, which greatly increases the risk of data leakage. In contrast, HTTPS proxies encrypt data using the SSL/TLS protocol, ensuring that data is secure during transmission. Even if the data is captured during transmission, a third party cannot decipher the data content due to encryption. According to the analysis of network security experts, the risk of data leakage is reduced by more than 90% with HTTPS proxy. Comparison of Uses and ScenariosHTTP proxy is commonly used for non-encrypted HTTP communication, such as accessing common websites or bypassing certain geographical restrictions. It has relatively simple application scenarios and is mainly suitable for environments that do not require high data security. However, the use of HTTP proxies has been gradually restricted as awareness of network security increases. HTTPS proxies, on the other hand, are widely used in scenarios that require high security, such as online banking, e-commerce, and the transmission of sensitive information. Due to its encryption feature, HTTPS proxy can effectively protect user data from unauthorized access. For example, a survey of e-commerce websites showed that websites using the HTTPS proxy were 80% more secure in their transactions than those using the HTTP proxy. Security ComparisonIn terms of security, HTTP proxies are vulnerable to man-in-the-middle attacks and other cyber threats due to their lack of encryption. According to web security statistics, more than 60% of web communications that do not use encrypted proxies are vulnerable to man-in-the-middle attacks. HTTPS proxies provide strong security through the SSL/TLS protocol, effectively preventing data from being intercepted or tampered with during transmission. An analysis of SSL/TLS encryption shows that communications using HTTPS proxies are almost completely resistant to man-in-the-middle attacks, ensuring data integrity and confidentiality. As a result, HTTPS proxies are the preferred solution for network communications that require a high level of security.

Static Residential IP is an effective solution to the multiple account anti-association problem. It helps users avoid the risk of association between accounts by assigning a separate IP address to each account, thus protecting users' privacy and security. The advantage of using static residential IP is its stability and persistence. Compared with dynamic IP, static residential IP is fixed for a long period of time and is less likely to arouse the suspicion of operators. To solve the problem of multi-account anti-association, users can take the following measures: 1. Use different static residential IP addresses to provide services for different accounts to ensure that each account has an independent IP to reduce the risk of being associated. 2. Choose a reliable static residential proxy service provider to ensure IP stability and quality. 3. Reasonably plan account usage strategies, such as not logging into multiple accounts on the same computer at the same time, using different browsers or virtual machines and other tools to log into accounts separately, as well as choosing different static residential IPs according to the usage and needs of different accounts to avoid repeated use of the same IP. In addition, the use of proxy servers or virtual networks, different email addresses for account registration, privacy browsing mode, password managers, and multi-factor authentication can also be effective in helping users to prevent association between multiple accounts. At the same time, using a fingerprint browser can simulate the hardware and software fingerprint information, IP address, etc. of different physical devices, realizing the use of a single computer to open multiple browser alters at the same time, each of which can be set up with an independent IP address, fingerprint parameters, and network environment. When managing multiple accounts, you should also pay attention to the following points: Change the proxy IP regularly to reduce the risk of being detected.Simulate normal user behavior to avoid suspicion due to overly mechanical operation. Ensure that all behaviors using proxy IPs comply with legal and regulatory requirements to avoid the legal risks associated with abuse. Combine virtual machine or container technology to run each account with a proxy to enhance isolation between accounts. In conclusion, the reasonable use of static residential IP and the corresponding management strategy can effectively help users solve the problem of multi-account anti-association.

A streaming proxy is a technology that allows users to access and deliver streaming content, such as video and audio streams, through a proxy server. This technology can be used in a variety of application scenarios including, but not limited to, cybersecurity and privacy protection, data harvesting and crawling, accelerated web access, P2P applications and streaming services, as well as scenarios with no connectivity and low latency requirements. Streaming proxies work by forwarding streaming data through a proxy server, enabling users to bypass regional restrictions or copyright issues to access specific streaming content. For example, some streaming services may be unavailable in a particular region due to geographic restrictions, and the use of a proxy streaming can help users bypass these restrictions by connecting to servers located in other regions to access restricted content. In addition, streaming proxies can be used to improve the efficiency and stability of streaming data transmission. For example, in applications such as live conference broadcasting, a plurality of proxy users can be set up to proxy the streaming data of the main conference hall, so that when other users request streaming data from the proxy users, the streaming data of the main conference hall will be acquired, thereby realizing data diversion and avoiding network congestion caused by users of the main conference hall due to too many user requests. In terms of technical implementation, streaming media proxy can be realized in different ways, such as streaming media proxy based on WebRTC technology, which uses WebRTC's audio/video transmission and P2P connection functions to realize real-time audio/video communication in the browser. In addition, Nginx's streaming proxy function can proxy common .m3u8, .ts, .mp3 and many other formats of streaming media, through the use of a specific Nginx module http_sub_module. Open source RTSP streaming servers such as EasyDarwin, RtspServer, SRS, etc., provide advanced feature configurations including stream forwarding, load balancing, security settings, etc., which can effectively handle various needs in streaming media proxy. The advantages of these servers lie in their functional characteristics, technical implementation, performance comparison and application scenarios, which can provide developers with a comprehensive selection reference. Overall, streaming proxy is a powerful tool for privacy protection, data collection, network access acceleration, and support for a variety of streaming services for many different application scenarios.

Web Crawling and Web Scraping are two related but differentiated concepts that are commonly used in the context of data collection and Internet data processing. Web Crawling is the process of automatically browsing the Internet to discover and index online content by jumping from one web page to another. This process is often used by search engines, such as Google or Bing, which use crawlers (also known as spiders or robots) to discover new or updated web pages and add them to the search engine's index. The purpose of web crawling is to create a database of web pages so that users can search and quickly find relevant information. Web scraping is the process of extracting data from a website, usually using automated tools to copy structured information on a web page, such as text, images, and links. The crawled data can be used for a variety of purposes, including market research, data analysis, content syndication, or personal projects. Web crawling usually involves parsing HTML or XML documents and extracting the required data fields, which can be stored in databases or spreadsheets for further use. In short, web crawling focuses more on discovering and indexing web pages, while web crawling focuses on extracting and using data from web pages. There are technical similarities between the two, such as the fact that both may use automated scripts and process HTTP requests, but they have different goals and application scenarios. Web crawling is the basis of search engines, while web crawling is the basis of data collection and analysis.