普通代理IP如何避免被X-Forward-For发现?

本文介绍了如何通过理解X-Forward-For头域的工作原理,以及如何在Python中定制请求头来伪造此字段,从而在使用普通代理IP时避免被真实IP暴露。通过设置X-Forwarded-For请求头,可以有效地保护自己的隐私。

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代理IP的一大优势是我们可以通过IP地址的切换,让我们的真实IP地址在上网的时候得到很好的隐藏,根据不同的隐匿效果,代理IP可以分为透明代理、普通代理、高匿代理这几种。
透明代理的隐私度较差,普通代理能够用一些技术手段被破除,那么,是不是用普通代理就一定会被 X-Forward-For 发现?
在解读 RFC7239 - Example Usage 时,我们了解到 X-Forward-For 会记录原始 IP,在使用多层 IP 代理的情况下记录的是上层 IP。利用这个特点,是不是可以伪造一下呢?
既然 X-Forward-For 和 Referer 一样是头域,那么就说明它可以被人为改变。我们只需要在请求时加上 X-Forward-For 请求头和对应的值即可。代码片段 Python-Request-CustomHeader 实现了这样的需求。

import requests
#请求地址
targetUrl = ""Loading…""
#代理服务器
proxyHost = ""220.185.128.170""
proxyPort = ""9999""
proxyMeta = ""http://%(host)s:%(port)s"" % {
""host"": proxyHost,
""port"": proxyPort,
proxies = {
""http"": proxyMeta,
header = {
""Referer"": ""Welcome to nginx!"",
""X-Forwarded-For"": ""_"",
resp = re
### X-Forward-For Header Purpose and Usage The `X-Forward-For` header is a de facto standard HTTP header for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer. This header allows servers to identify original clients when they are behind proxies, which might otherwise obscure this information. When a request passes through multiple proxies, each intermediate proxy adds its own IP address to the list maintained by the `X-Forward-For` header. The format typically consists of a comma-separated list where the first IP represents the initial client's IP address followed by any subsequent intermediaries' addresses[^1]. Here’s how one can inspect and utilize the `X-Forward-For` header within Python using Flask as an example: ```python from flask import request @app.route('/') def index(): # Get all forwarded IPs from the X-Forwarded-For header. forwarded_ips = request.headers.getlist("X-Forwarded-For") if forwarded_ips: # Take only the last IP in case there were several layers of proxies. user_ip = forwarded_ips[-1] else: # If no forward headers exist, use direct remote addr. user_ip = request.remote_addr return f"Your IP Address: {user_ip}" ``` In environments with trusted reverse proxies configured between end-users and application servers, administrators should ensure that these intermediary devices properly append their respective IP addresses into existing `X-For` fields rather than overwriting them entirely. Additionally, applications must validate whether incoming connections originate via expected gateway points before trusting such metadata implicitly provided by external entities without verification mechanisms in place[^3].
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