Python 使用Twisted的代理用户名/密码

我试图使用Twisted的类连接到代理服务器并发出HTTP请求，但是服务器需要用户名和密码。是否可以使用ProxyAgent向服务器指定这些凭据

endpoint = TCP4ClientEndpoint(reactor, host, port)
agent = ProxyAgent(endpoint)

# Maybe need to pass auth credentials in the header here?
body = agent.request("GET", path)

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解决问题后，必须在标题中设置代理授权字段：

endpoint = TCP4ClientEndpoint(reactor, host, port)
agent = ProxyAgent(endpoint)

headers = {}
auth = base64.b64encode("%s:%s" % (username, password))
headers["Proxy-Authorization"] = ["Basic " + auth.strip()]

body = agent.request("GET", path, Headers(headers))