1. All data requests sent over the Internet contain a header that identifies the sender. They are not part of the request message itself, but rather describe it like metadata.
2. The proxy protects your identity by removing some or all of the headers before passing the request to the target site. The more titles you remove, the higher the anonymity level. Highly anonymous proxies provide the highest degree of anonymity, in part by removing the most headers.
For optimal anonymity, they not only remove all identifier headers and mask your IP address, but also hide the fact that you are using a proxy service.
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