我试图建立代理scrappy剧作家，但总是得到错误

playwright._impl._api_types.Error: net::ERR_TIMED_OUT at http://whatismyip.com/
=========================== logs ===========================
navigating to "http://whatismyip.com/", waiting until "load"

当执行代码时：

from scrapy import Spider, Request
from scrapy_playwright.page import PageMethod

class ProxySpider(Spider):
    name = "check_proxy_ip"
    custom_settings = {
        "PLAYWRIGHT_LAUNCH_OPTIONS": {
            "proxy": {
                "server": "http://host:port",
                "username": "user",
                "password": "pass",
            },
        },
        "PLAYWRIGHT_DEFAULT_NAVIGATION_TIMEOUT": "300000",
    }

    def start_requests(self):
        yield Request("http://whatismyip.com",
                      meta=dict(
                          playwright=True,
                          playwright_include_page=True,
                          playwright_page_methods=[PageMethod('wait_for_selector', 'span.ipv4-hero')]
                      ),
                      callback=self.parse,
                      )

    def parse(self, response):
        print(response.text)

尝试的代理是付费的，并按检查的方式工作，settings.py中的DOWNLOAD_DELAY设置为DOWNLOAD_DELAY=30。无论PLAYWRIGHT_DEFAULT_NAVIGATION_TIMEOUT设置为0、10000还是300000（如上面代码中所复制的），都会发生这种情况。有什么问题吗？