How to judge whether the proxy IP is authorized incorrectly

Certain high-quality proxy IP must be authorized, if not authorized, it will be used by many people. There are two common authorization methods, one is the binding machine IP mode (commonly known as adding a whitelist), special attention: here is the bound machine IP using the proxy, not extracting the machine IP using the proxy; the other is the user name +Password mode, this is the user name + password authorization when using the proxy. Frequently asked questions: The machine IP is bound, but the authorization mode is "username + password". This problem is particularly common. At least half of the authorization problem consultations are related to this problem.
The following are the detailed inspection steps:
1. Log in to the proxy IP website management background and check directly;
2. The browser sets the proxy IP test, and there is no IP whitelist authorization mode or user name + password authorization mode bound to the fixed terminal IP, set in the browser After proxying the IP, a user name + password dialog box will pop up, asking for the user name and password;
3. The code running result will generally return a 407 error.
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