Some sites may have taken some measures to detect and block access from proxy IPs. These sites may use some technical means to identify proxy IPs and take blocking or restricting measures when proxies are detected. Some possible reasons include:
1. IP blacklist: The site may maintain an IP blacklist that includes known proxy IP addresses. If the proxy IP you are using is on the blacklist, access will be blocked.
2. Detect user behavior: The site may detect whether a proxy is used by analyzing the user's behavior. For example, if the user's request pattern is similar to the proxy behavior, the site may take action.
3. JavaScript detection: Some sites use JavaScript to detect proxies. Proxies may not execute JavaScript, or behave differently when executed, which may cause sites to detect the proxy and block access.
4. Network fingerprinting: The site may use network fingerprinting technology to identify proxies by analyzing the characteristics of user network requests.
Please note that using a proxy IP for access may violate the usage policy of some websites, so it is recommended to follow the website's regulations when using a proxy IP. In addition, the quality and anonymity of the proxy IP will also affect whether you can successfully bypass the site's detection.
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