How to detect proxies using API

How to detect proxies using API is important for businesses because it helps them catch harmful agents who try to spoof their connection details to commit fraudulent activities. However, detecting proxies can be difficult since they hide the real IP address of the user. There are several ways to identify if someone is using a proxy, but some of them are less reliable than others.

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One way to detect proxies is by checking the headers of the request. Proxies often add a Forwarded or X-Forwarded-For header that can indicate that the request is being sent through a proxy server. However, this method isn’t very reliable because many proxies don’t add these headers or use other techniques to avoid being detected.

Another method is to check the response from the server. If the server responds with a 404 error or sends back a small amount of data, this is a sign that the proxy is causing the request to fail. Another way to test the response is by pinging the proxy server and checking for latency. A proxy will usually cause the request to take longer than if it was direct, so checking for latency is a good way to spot a proxy.

A third method is to use a specialized proxy detection service. There are a number of benefits to using a dedicated proxy detection service, including increased accuracy for looking up IP reputation, avoiding false positive connections so legitimate traffic isn’t penalized, comprehensive proxy blocking that includes more unique tests than can be performed with public methods like the header and port scan and blacklisting discussed above, and catching even the stealthiest of proxies.